Red-eared slider resting at the water's edge — Red-eared slider (*Trachemys scripta elegans*), a commonly kept aquatic turtle and representative of the age-related dietary shifts discussed in this guide.

Reptile Nutrition

Aquatic Turtle Diet Guide

A booklet-style guide to feeding captive freshwater and semi-aquatic turtles, with general food preparation and nutritional principles followed by expanded feeding chapters for the major captive groups.

Author: Robert L. Linville, DVM
Medical review: Updated, evidence-reviewed, and taxonomy-reviewed August 2026

Scope of this booklet

“Aquatic turtle” is not one nutritional category. Living freshwater and semi-aquatic turtles include hundreds of species with diets ranging from strongly herbivorous to highly carnivorous. This guide concentrates on the major groups encountered in captivity and the species represented in this site's reptile resources, while adding closely related species when current taxonomy or feeding biology makes that useful. It is not intended as captive-care guidance for sea turtles. Sea turtles are protected wildlife requiring specialized rehabilitation or zoological programs.

The 2025 Turtles of the World checklist is used as the principal global taxonomic framework, supplemented by the current Reptile Database. Rare, protected, or conservation-sensitive species are included for identification and nutritional context; inclusion does not imply that they are appropriate private pets.

Part I — General Aquatic-Turtle Nutrition

Freshwater turtles have evolved to exploit very different food resources. Some, such as adult cooters and several Australian short-necked turtles, may consume large amounts of aquatic vegetation. Sliders and painted turtles commonly become more plant-oriented with age. Map turtles and diamondback terrapins may depend heavily on mollusks and crustaceans. Musk and mud turtles forage along the bottom for invertebrates and carrion. Softshells and long-necked turtles are much more carnivorous. Pig-nosed and South American river turtles can be strongly frugivorous or herbivorous. A diet designed for a red-eared slider therefore cannot simply be copied for every turtle that lives in water.

Modern veterinary nutrition references emphasize three broad principles: use a diet appropriate to the natural feeding ecology; avoid rapid growth and chronic overfeeding; and remember that nutrition is inseparable from environmental temperature, UVB exposure, water quality, and access to a suitable basking area where the species normally basks.

Feeding pattern	Examples	Captive emphasis
Ontogenetic omnivore	Sliders, painted turtles	More animal matter in juveniles; progressively more plant material in adults.
Herbivore-leaning aquatic grazer	Many cooters, some Elseya, yellow-headed temple turtle	Aquatic plants, algae, leafy vegetation, formulated diet used conservatively; animal foods limited according to species and age.
Mollusk/invertebrate specialist	Many map turtles, diamondback terrapin, musk turtles	Whole invertebrate prey, snails or mollusk analogues, crustaceans, balanced pellets; less emphasis on salad-type diets.
Carnivore/piscivore	Softshells, snake-necked turtles, mata mata	Whole aquatic prey, cultured invertebrates, nutritionally complete carnivore/omnivore turtle diets; avoid fillet-only or feeder-fish-only feeding.
Riparian frugivore/herbivore	Pig-nosed turtle, many Podocnemis	Leaves, aquatic vegetation, appropriate fruits/seeds and some animal material according to species.

Food Types and Preparation

1. Formulated aquatic-turtle diets

Commercial pellets or extruded diets can be a useful nutritional anchor because they provide more consistent vitamin and mineral content than random mixtures of fish, meat, and produce. Current Merck guidance notes that commercial aquatic-turtle foods commonly contain roughly 30–50% protein and may be appropriate for carnivorous and omnivorous turtles. That range should not be interpreted as a target for every species: herbivore-leaning adults require substantial plant material, while highly carnivorous species require different fresh-food complements.

2. Cultured invertebrates

Useful foods include earthworms, appropriately sized crickets, black soldier fly larvae, freshwater snails from controlled sources, cultured shrimp or prawns, and selected aquatic invertebrates. Feeder insects should be healthy and well nourished. Wild aquatic insects, snails, crayfish, fish, tadpoles, or frogs should not be collected from uncontrolled sites because of pesticide, parasite, toxin, and infectious-disease risks.

3. Whole vertebrate prey

Whole prey provides bone, organs, connective tissues, and micronutrients that a boneless fish fillet or piece of chicken does not. For species that naturally consume vertebrates, appropriately sourced whole small fish may be used in rotation. Larger or unusual prey such as rodents, birds, frogs, or other reptiles should not be routinely improvised for pet turtles merely because such prey has been recorded in wild stomach contents.

4. Aquatic plants

Depending on species, safe aquatic plants may include duckweed, water lettuce where legal and pesticide-free, water sprite, hornwort/coontail, pondweed, water celery, and other positively identified non-toxic aquatic vegetation. Some plants are invasive or regulated in particular states; do not release aquarium plants or turtles into natural waterways.

5. Leafy greens and vegetables

For slider-type omnivores and other plant-using turtles, offer dark leafy greens such as dandelion, collard, turnip and mustard greens, endive, escarole, watercress, and romaine as part of a varied plant rotation. Squash, carrot, green bean, and red or orange pepper can add color and micronutrient variety in modest quantities. These foods are substitutes for natural aquatic and riparian vegetation, not a reason to convert all aquatic turtles to a salad-heavy diet.

6. Fruit

Fruit is unnecessary for most North American pond turtles and should be uncommon in slider-style diets. It has a much more legitimate biological role in riparian-frugivorous turtles such as pig-nosed turtles, Amazon river turtles, and some tropical wood turtles. Even there, captive fruit should be varied and should not become an unrestricted high-sugar ration.

Preparation

Rinse produce and aquatic plants thoroughly and remove spoiled portions.
Cut firm foods only as much as needed for safe ingestion; larger leaves or clipped vegetation can encourage natural tearing and grazing.
Offer most highly aquatic turtles food in water because water is used to manipulate and swallow food.
Semi-aquatic wood and forest turtles may feed both in water and on land; follow species-specific behavior.
Thaw frozen foods under refrigeration or cool running water and feed promptly; do not repeatedly thaw and refreeze.
Remove uneaten animal food before it decomposes and remove large quantities of uneaten vegetation before it fouls the water.

Commercial Turtle Pellets: How to Use Them

A formulated diet is most useful when it prevents nutritional gaps, not when it becomes the only food offered for years. Select a reputable aquatic-turtle product with clear ingredient and nutrient information and a pellet size appropriate to the animal. Highly herbivorous adults should not be forced into a high-protein pellet-dominant diet, while carnivorous turtles should not be maintained on low-protein vegetable pellets intended for tortoises.

When changing diets, mix the new pellet with familiar foods gradually. Some turtles preferentially select high-fat or highly palatable prey and ignore balanced pellets; correcting this often requires reducing treats rather than repeatedly offering more enticing foods.

Animal Foods, Invertebrates, and Whole Prey

Animal foods are most valuable when they resemble the nutritional structure of natural prey. Earthworms, snails, crustaceans, insects, and whole small fish provide a broader nutrient profile than muscle meat. Grocery-store chicken breast, beef, hamburger, liver, or fish fillet is therefore not an appropriate staple. These items are calcium-poor, incomplete, and easy to overfeed.

Hard-shelled prey can also be behaviorally important. Female map turtles and diamondback terrapins possess enlarged crushing surfaces adapted to mollusks and crustaceans. Captive diets for these animals should include appropriately sized whole invertebrate prey or nutritionally equivalent textures rather than only soft pellets.

Plant Foods and Aquatic Vegetation

The plant portion should match species biology. Adult cooters may be predominantly herbivorous and consume algae and aquatic macrophytes. Adult sliders and painted turtles usually use more vegetation than juveniles. In contrast, softshells and many long-necked turtles obtain little nutritional benefit from being forced to eat large amounts of leafy greens.

Introduce plant foods early in species known to become more herbivorous with age. A juvenile slider that is never exposed to plants may become behaviorally resistant to them later. Floating leaves, clipped greens, and living aquatic plants provide both nutrition and enrichment.

Fish, Thiaminase, and Feeder-Fish Cautions

A fish-only diet is inappropriate for most captive turtles. Fish species differ in fatty-acid profile, mineral balance, and thiaminase activity. Long-term feeding of frozen/thawed fish high in thiaminase can cause vitamin-B1 deficiency, with neurologic signs such as tremors, abnormal posture, weakness, or apparent blindness. Current Merck guidance specifically identifies this risk in piscivorous reptiles and turtles.

Avoid making goldfish, smelt, or other feeder fish the routine bulk of the diet. If fish are biologically appropriate, rotate suitable species and combine them with formulated diets and other whole prey. Never use fish from bait buckets or local waterways as routine feed because infectious agents, contaminants, and medications are uncontrolled.

Calcium, Vitamins, UVB, and Heat

Shell and skeletal mineralization depend on calcium intake, phosphorus balance, vitamin-D physiology, UVB exposure, and proper temperature. Many basking freshwater turtles should have effective UVB lighting when maintained indoors plus a completely dry basking platform at the correct species-specific temperature. Glass and most plastics block useful UVB.

Whole prey with bone or shell, balanced commercial diets, and access to cuttlebone can improve calcium intake. Loose calcium powder is difficult to dose reliably in water because it washes from food; dusting may be more useful for foods eaten promptly at the surface or on land in semi-aquatic species.

Vitamin A requires particular care. Hypovitaminosis A remains common in aquatic turtles eating poorly balanced diets and may cause swollen eyelids, epithelial disease, poor appetite, respiratory disease, and aural abscesses. Merck notes that beta-carotene is not reliably converted to vitamin A by many reptiles. At the same time, excessive preformed vitamin A can be toxic. Correct the diet first and use concentrated vitamin supplementation under veterinary direction rather than repeatedly injecting or heavily dosing vitamin A.

Water Quality, Temperature, and Feeding

Aquatic turtles eat, drink, urinate, defecate, and often shed food debris in the same water. Poor water quality therefore directly undermines nutritional and medical health. Use oversized mechanical and biological filtration, remove uneaten animal food quickly, and perform regular partial water changes. Water temperature should be appropriate to species and life stage; digestion slows when turtles are maintained too cool.

Feeding in a separate tub can reduce debris in the primary enclosure, but it is optional rather than mandatory. Moving a shy turtle for every meal can cause stress, and food should never be offered in cold water. If a separate feeding container is used, keep its temperature appropriate and return the turtle promptly after the meal.

Feeding Frequency, Portions, and Life Stage

There is no scientifically validated single “head-sized portion” rule for all aquatic turtles. Feed according to species, age, energy density of the food, body condition, and environmental temperature.

Hatchlings and rapidly growing juveniles: often require food daily or nearly daily, particularly in carnivorous and omnivorous groups.
Subadults: gradually reduce feeding frequency and energy density as growth slows.
Adults: many commonly kept turtles do well with measured substantial meals approximately every other day or several times weekly, while low-energy plant foods may remain available more often in herbivore-leaning species.
Large carnivores: should generally receive fewer, appropriately sized meals rather than frequent high-calorie feeding.
Reproductive females: require adequate calcium, energy, hydration, UVB, and a proper nesting site; increased feeding should still be controlled by body condition.

Seasonality, Winter Inactivity, and Brumation

Temperate aquatic turtles commonly reduce food intake as water temperature and daylight decline. Do not continue forcing normal summer meal sizes into a turtle whose metabolism is slowing. Planned brumation is species-specific and should not be attempted in an animal that is underweight, ill, parasitized, or of uncertain species. Tropical species should not be subjected to temperate brumation simply because they are turtles.

Monitoring Nutritional Health

Record body weight at consistent intervals using the same scale.
Watch for excessive fat bulging around limb openings, rapid juvenile weight gain, or reduced mobility.
Inspect the shell for abnormal softness, distortion, retained scutes, focal ulcers, or unusual pyramidal growth.
Monitor appetite, fecal consistency, buoyancy, swimming strength, and ability to climb onto the basking platform.
Swollen eyelids, aural swelling, nasal discharge, weakness, tremors, abnormal floating, or persistent anorexia require veterinary evaluation rather than simply adding vitamins.

Part II — Species and Group Feeding Chapters

Each chapter lists the species or taxonomic scope covered, summarizes natural feeding ecology, and then provides practical captive feeding guidance. Where a genus contains many poorly studied species, the species list establishes current taxonomy but the feeding recommendations are intentionally conservative and should be refined with species-specific zoological literature when available.

1. Pond Sliders — Trachemys

Species included

The genus Trachemys currently contains 17 recognized species. The species most commonly kept worldwide is the pond slider, Trachemys scripta, with three familiar subspecies: yellow-bellied slider (T. s. scripta), red-eared slider (T. s. elegans), and Cumberland slider (T. s. troostii). The detailed feeding schedule below is centered on T. scripta; other Trachemys should be adjusted for their local natural history.

Natural feeding ecology

Sliders show a strong age-related dietary shift. Juveniles consume aquatic insects, crustaceans, mollusks, fish, tadpoles and other animal material, while adults increasingly consume aquatic vegetation, algae, leaves, stems, flowers, and seeds. Experimental work in T. scripta shows that juveniles can digest plants but grow much more efficiently on animal prey, helping explain the natural ontogenetic shift.

Captive diet

Use a reputable aquatic-turtle pellet as part of the diet, offer cultured invertebrates or suitable whole aquatic prey to juveniles, and provide plant foods from an early age. Adults should receive a much larger plant component than hatchlings. Aquatic plants and leafy greens are preferable to fruit.

Frequency / When / Where / How

Frequency: Hatchlings and small juveniles: usually daily measured feeding. Larger juveniles: daily to every other day depending on growth. Adults: measured higher-energy foods about 3–4 times weekly, with safe vegetation offered more frequently.
When: Feed during the active daylight period after the turtle has warmed and is swimming normally.
Where: Food is normally taken in water. Clip leafy vegetation near the swimming/basking zone or float it where the turtle can graze.
How: Juveniles receive proportionally more pellets and invertebrates. Shift adults toward aquatic plants and greens instead of simply reducing the number of animal-prey meals while leaving the diet prey-heavy.

Common mistakes

Feeding adult sliders like permanent carnivorous juveniles; relying on dried shrimp; offering only pellets; allowing uncontrolled goldfish consumption; and failing to provide UVB and a dry basking area.

2. Cooters and Red-Bellied Turtles — Pseudemys

Species included

Pseudemys alabamensis — Alabama red-bellied turtle
P. concinna — river cooter
P. floridana — Florida cooter
P. gorzugi — Rio Grande cooter
P. nelsoni — Florida red-bellied turtle
P. peninsularis — peninsula cooter
P. rubriventris — northern red-bellied turtle
P. texana — Texas river cooter

Natural feeding ecology

Pseudemys are substantially more herbivorous as adults than many sliders. Field studies document aquatic macrophytes, filamentous algae, pondweeds, coontail, eelgrass, water celery and similar vegetation as major adult foods. Juveniles take more insects, mollusks, crustaceans and occasional fish.

Captive diet

For adults, build the diet around safe aquatic plants, algae-grazing opportunities, leafy greens, and a lower-protein formulated turtle diet used in moderation. Animal prey should be a minor component for most healthy mature cooters, not half of every meal.

Frequency / When / Where / How

Frequency: Juveniles: usually daily or near-daily, with both plant and animal foods. Adults: vegetation can be available most days; concentrated pellets or animal foods are offered in measured portions several times weekly or less, depending on species and body condition.
When: Daytime after warming.
Where: In water, with floating or anchored vegetation that can be grazed naturally.
How: Use whole leaves, aquatic plants, and clipped greens to encourage prolonged grazing. Avoid turning adult cooters into pellet-fed high-protein omnivores.

3. Painted Turtles — Chrysemys

Species included

Current taxonomy recognizes Chrysemys picta (painted turtle) and Chrysemys dorsalis (southern painted turtle) as species. Older literature often treated the southern painted turtle as C. picta dorsalis. Within C. picta, geographic forms commonly called eastern, midland, and western painted turtles remain familiar in husbandry literature.

Natural feeding ecology

Painted turtles are generalist omnivores. Juveniles rely more strongly on small animal prey; adults consume aquatic plants and algae along with insects, crustaceans, carrion and occasional fish. Feeding occurs in water.

Captive diet

Use a slider-like framework but avoid assuming identical percentages. Provide formulated pellets, cultured aquatic or terrestrial invertebrates, and plant foods throughout life, progressively increasing vegetation as the turtle matures.

Frequency / When / Where / How

Frequency: Small juveniles commonly daily; adults several measured meals weekly with plant material available more often.
When: During the warm active daytime period.
Where: In water; provide a clean shallow feeding area for small juveniles if needed.
How: Rotate pellets, invertebrates, and aquatic/leafy plants; do not rely on dried shrimp or fish.

4. Map Turtles — Graptemys

Species included — 14 currently recognized species

G. barbouri
G. caglei
G. ernsti
G. flavimaculata
G. geographica
G. gibbonsi
G. nigrinoda
G. oculifera
G. ouachitensis
G. pearlensis
G. pseudogeographica — false map turtle
G. pulchra
G. sabinensis
G. versa

Natural feeding ecology

Map turtles are not simply small sliders. Many specialize on riverine invertebrates. Adult females of broad-headed species can be strongly molluscivorous, using powerful crushing surfaces to process snails, mussels, and clams; smaller males often eat smaller mollusks and insect larvae. This sexual trophic dimorphism is particularly well documented in northern map turtles.

Captive diet

Provide a quality aquatic-turtle pellet plus varied invertebrates. Appropriate snails, mollusk-based foods, crustaceans, earthworms and aquatic insects should be emphasized more than salad in strongly molluscivorous species. Some plant material can be offered, but forcing a broad-headed adult female onto a slider-style plant-majority diet ignores its feeding morphology.

Frequency / When / Where / How

Frequency: Juveniles daily or near-daily; adults usually several measured meals weekly. Large females consuming energy-dense mollusks require careful portion control.
When: Daytime after warming; most are active baskers.
Where: Feed in water, preferably where dropped food can be recovered rather than lost in gravel.
How: Offer prey appropriate to head size and sex. Include hard-textured whole invertebrates when safe rather than feeding only soft sticks.

5. Diamondback Terrapin — Malaclemys terrapin

Species included

One species, Malaclemys terrapin, with seven currently recognized subspecies: M. t. terrapin, centrata, littoralis, macrospilota, pileata, rhizophorarum, and tequesta.

Natural feeding ecology

Diamondback terrapins inhabit brackish estuaries and salt marshes. Their diet is dominated by mollusks, crustaceans, marine worms, insects, carrion and occasional fish, with limited plant material. Females develop particularly robust crushing jaws.

Captive diet

Feed as an estuarine mollusk/crustacean specialist, not as an herbivorous pond turtle. Use formulated aquatic-turtle diets plus controlled-source snails, bivalve or crustacean foods, shrimp/prawn, earthworms and occasional whole fish. Maintain appropriate salinity and fresh-water access according to husbandry protocol; nutrition cannot be separated from osmoregulation in this species.

Frequency / When / Where / How

Frequency: Juveniles commonly daily; adults several meals weekly, adjusted to body condition.
When: During active warm periods.
Where: Feed in appropriately maintained water; remove shell fragments and leftovers.
How: Include hard-shelled invertebrate prey or safe equivalents that reflect the crushing-feeding ecology.

6. Musk Turtles — Sternotherus

Species included — 6 recognized species

Sternotherus carinatus — razor-backed musk turtle
S. depressus — flattened musk turtle
S. intermedius
S. minor — loggerhead musk turtle
S. odoratus — common/eastern musk turtle
S. peltifer

Natural feeding ecology

Musk turtles are bottom-foraging omnivores with a strong animal-food component. Common musk turtles probe mud, sand and decaying vegetation for snails, clams, crayfish, aquatic insects, worms, fish eggs, small fish, tadpoles, carrion, algae and plant material. Smaller juveniles use more small insects and soft foods.

Captive diet

Use sinking or slowly sinking turtle pellets, cultured snails, earthworms, insect larvae, crustaceans, and occasional whole fish. Plant material can be present but should not displace the invertebrate-rich diet typical of the group.

Frequency / When / Where / How

Frequency: Small juveniles daily; adults typically every other day or 3–4 times weekly.
When: Many forage at dusk or night as well as daytime; feed when the individual is naturally active.
Where: Near the bottom or among submerged structure rather than expecting surface feeding.
How: Scatter several small prey items or sinking pellets to encourage olfactory bottom-searching behavior.

7. Mud Turtles — Kinosternon

Species included

Current taxonomy recognizes 26 species in Kinosternon:

K. abaxillare
K. acutum
K. alamosae
K. albogulare
K. angustipons
K. baurii
K. chimalhuaca
K. cora
K. creaseri
K. cruentatum
K. dunni
K. durangoense
K. flavescens
K. herrerai
K. hippocrepis
K. hirtipes
K. integrum
K. leucostomum
K. mexicanum
K. oaxacae
K. scorpioides
K. sonoriense
K. steindachneri
K. stejnegeri
K. subrubrum — eastern mud turtle
K. vogti

Natural feeding ecology

As a group, mud turtles are opportunistic bottom-foraging omnivores, but the relative use of animal and plant material varies by species and habitat. Eastern mud turtles consume insects, mollusks, crustaceans, amphibian larvae, carrion, aquatic vegetation and occasional fish. Several tropical species forage both in shallow water and on land.

Captive diet

Use sinking pellets and whole invertebrate foods as the foundation, with plant material offered where natural history supports it. Provide shallow-water feeding opportunities for small species and terrestrial feeding areas for species known to forage on land.

Frequency / When / Where / How

Frequency: Juveniles daily or near-daily; adults commonly several meals weekly.
When: Many species are crepuscular or nocturnal in warm weather.
Where: Bottom or shallow-water feeding zones; some species also forage terrestrially.
How: Use small whole prey and sinking foods; avoid deep bare tanks that prevent normal bottom exploration in species adapted to shallow, structured wetlands.

8. Snapping Turtles — Family Chelydridae

Species included — 5 recognized species

Chelydra serpentina — common snapping turtle
C. rossignonii — Central American snapping turtle
C. acutirostris — South American snapping turtle
Macrochelys temminckii — alligator snapping turtle
M. suwanniensis — Suwannee alligator snapping turtle

Natural feeding ecology

Common snapping turtles are true opportunistic omnivores and may consume substantial aquatic vegetation in addition to fish, amphibians, invertebrates, carrion, reptiles, birds and small mammals. Alligator snapping turtles are more strongly predatory and use a worm-like lingual lure to attract fish, although their wild diet is broader than fish alone.

Captive diet

Large size and high feeding drive make chronic overfeeding a major risk. Use complete aquatic-carnivore or omnivore turtle diets plus whole aquatic prey, invertebrates and, for common snappers, some plant material. Avoid large daily meals of rodents, fish fillets, or raw meat.

Frequency / When / Where / How

Frequency: Juveniles can be fed daily. Larger subadults and adults generally require fewer substantial meals, often 2–4 weekly depending on size, temperature and body condition.
When: Feed when water is warm enough for normal activity and digestion.
Where: In water; use tools rather than hand-feeding large animals.
How: Offer whole prey of manageable size and formulated diets; spread calories across varied foods rather than feeding one large vertebrate item repeatedly.

9. Softshell and Flapshell Turtles

Species included

This chapter emphasizes commonly encountered representatives of Trionychidae, including North American Apalone ferox (Florida softshell), A. mutica (smooth softshell), A. spinifera (spiny softshell), Chinese softshell Pelodiscus sinensis, Indian flapshell Lissemys punctata, and African softshell Trionyx triunguis. Numerous additional Asian and African trionychids exist and may require species-specific refinement.

Natural feeding ecology

Softshells are generally carnivorous aquatic predators or scavengers. North American species consume aquatic insects, crayfish, snails, fish, amphibians and other aquatic animals; vegetation is minor or incidental. Their buried ambush behavior is as important as the food list.

Captive diet

Feed a varied aquatic carnivore diet: suitable formulated pellets, earthworms, crustaceans, mollusks, aquatic insects and occasional whole fish. Avoid making fish the sole food. Because the shell is leathery and skin is easily damaged, feeding areas and substrate must remain clean.

Frequency / When / Where / How

Frequency: Juveniles daily; adults several measured meals weekly.
When: During normal activity at proper water temperature.
Where: In water, preferably over fine sand or a clean bare feeding area rather than sharp gravel.
How: Present sinking or moving prey near the substrate to permit natural ambush feeding.

10. North American Pond, Spotted, Bog, Blanding's, and Wood Turtles

Species included

Actinemys marmorata — northwestern pond turtle
Actinemys pallida — southwestern/southern Pacific pond turtle
Clemmys guttata — spotted turtle
Emydoidea blandingii — Blanding's turtle
Glyptemys insculpta — wood turtle
Glyptemys muhlenbergii — bog turtle

Natural feeding ecology

These species are semi-aquatic omnivores rather than interchangeable “pond turtles.” Spotted and Blanding's turtles consume aquatic invertebrates and plant material. Wood turtles forage extensively on land for earthworms, slugs, fungi, berries and vegetation. Pacific pond turtles consume aquatic invertebrates, carrion and plant matter. Many are legally protected or conservation-sensitive.

Captive diet

Use species-specific zoological or rehabilitation protocols rather than a generic slider ration. For legally held animals, combine formulated turtle diets with earthworms, snails, insects, aquatic prey and appropriate plant or fruit items where natural history supports them.

Frequency / When / Where / How

Frequency: Juveniles usually daily; adults several meals weekly.
When: Follow seasonal activity and temperature; several species undergo winter dormancy.
Where: Provide both aquatic and terrestrial feeding opportunities for strongly semi-terrestrial species such as wood turtles.
How: Scatter naturalistic small prey and plant foods through a complex enclosure rather than forcing all feeding into deep water.

11. Asian Pond and Temple Turtles

Species included

The Asian pond-turtle genus Mauremys currently includes nine species: M. annamensis, M. caspica, M. japonica, M. leprosa, M. mutica, M. nigricans, M. reevesii, M. rivulata, and M. sinensis. This chapter also includes the yellow-headed temple turtle Heosemys annandalii and giant Asian pond turtle H. grandis.

Natural feeding ecology

Mauremys are generally omnivorous, often with greater animal-food use when young and more vegetation in larger animals. The yellow-headed temple turtle is substantially more herbivorous than a typical slider and readily consumes aquatic plants, leaves, vegetables and fruit. These differences justify keeping them in the same husbandry chapter but not feeding them identically.

Captive diet

For Mauremys, combine pellets, invertebrates and aquatic/leafy vegetation, increasing plants with age where appropriate. For Heosemys annandalii, emphasize vegetation and aquatic plants, with animal foods limited. Avoid indiscriminate high-protein feeding of large herbivore-leaning temple turtles.

Frequency / When / Where / How

Frequency: Juveniles generally daily; adults several meals weekly, while low-energy vegetation may be available more often in herbivorous species.
When: Warm daytime period.
Where: Aquatic feeding for pond turtles; shallow-water and shoreline feeding zones are useful for large temple turtles.
How: Match the animal-to-plant ratio to species and age rather than using one “Asian turtle” formula.

12. Neotropical Wood Turtles — Rhinoclemmys

Species included — 9 recognized species

R. annulata
R. areolata
R. diademata
R. funerea
R. melanosterna
R. nasuta
R. pulcherrima
R. punctularia
R. rubida

Natural feeding ecology

These tropical American geoemydids range from highly terrestrial forest forms to strongly semi-aquatic species. Many consume fruit, leaves, fungi, invertebrates and carrion, and some feed readily both on land and in water. They should not be managed as miniature sliders.

Captive diet

Use a varied semi-aquatic omnivore diet: leafy vegetation, safe fruits in species known to be frugivorous, mushrooms or fungi only when positively identified and appropriate, earthworms, snails, insects, and a quality turtle pellet. The exact ratio depends strongly on species.

Frequency / When / Where / How

Frequency: Juveniles daily or near-daily; adults several meals weekly with low-energy plant foods available more often.
When: During warm active periods, often morning or evening in humid tropical setups.
Where: Both land and shallow water, according to species.
How: Scatter fruit/plant items and invertebrates across moist terrestrial feeding zones and shallow water to encourage foraging.

13. African Side-Neck Turtles — Pelomedusa and Pelusios

Species included

Current taxonomy recognizes 10 Pelomedusa species: P. barbata, P. galeata, P. gehafie, P. kobe, P. neumanni, P. olivacea, P. schweinfurthi, P. somalica, P. subrufa, and P. variabilis. The genus Pelusios currently contains 18 species, including commonly encountered P. castaneus and P. sinuatus, and the recently named P. hyneki (2025).

Pelusios adansonii
P. bechuanicus
P. broadleyi
P. carinatus
P. castaneus
P. castanoides
P. chapini
P. cupulatta
P. gabonensis
P. hyneki
P. marani
P. nanus
P. niger
P. rhodesianus
P. sinuatus
P. subniger
P. upembae
P. williamsi

Natural feeding ecology

African side-necks are generally animal-food-oriented omnivores or carnivores. Helmeted turtles consume insects, worms, crustaceans, snails, fish, amphibians, carrion and occasionally plant material. Many Pelusios are opportunistic feeders in permanent or seasonal African wetlands.

Captive diet

Use high-quality omnivorous/carnivorous aquatic turtle pellets plus earthworms, snails, crustaceans, insects and occasional whole fish. Offer vegetation to omnivorous individuals but do not force a slider-style plant-majority diet on species whose natural feeding ecology is strongly carnivorous.

Frequency / When / Where / How

Frequency: Juveniles often daily; adults typically every other day or 3–4 times weekly.
When: Warm active periods; seasonal species may feed heavily after rains and reduce activity during dry-season dormancy.
Where: In water; shallow-water feeding often works well for helmeted turtles.
How: Provide varied whole invertebrate prey and sinking pellets; remove leftovers rapidly in warm tropical water.

14. South American Side-Necks and Mata Mata

Species included

This broad chelid chapter covers commonly referenced South American side-necks such as Phrynops hilarii, Phrynops geoffroanus, several Mesoclemmys species, and the highly specialized mata mata (Chelus fimbriata and related current Chelus taxa). Because feeding ecology varies markedly, species identification is essential.

Natural feeding ecology

Many Phrynops and Mesoclemmys are opportunistic carnivores or omnivores consuming arthropods, mollusks, fish, amphibians and carrion. Mata matas are specialized suction-feeding aquatic predators, primarily taking fish and other aquatic animals.

Captive diet

Use whole aquatic prey, earthworms, crustaceans, insects and appropriate carnivorous turtle diets. Mata matas require a predominantly aquatic animal-prey diet and should not be fed salad or fruit. Avoid feeder-fish-only management; rotate nutritionally appropriate whole prey and use veterinary supplementation when needed.

Frequency / When / Where / How

Frequency: Juveniles daily; adults several meals weekly depending on size and species.
When: During normal warm activity; many are ambush feeders.
Where: In water, with sufficient depth for normal suction feeding in long-necked or mata mata forms.
How: Present appropriately sized moving or sinking prey and minimize handling at feeding time.

15. South American River Turtles — Family Podocnemididae

Species included — 8 recognized species

Erymnochelys madagascariensis — Madagascar big-headed turtle
Peltocephalus dumerilianus — big-headed Amazon river turtle
Podocnemis erythrocephala
P. expansa — giant South American river turtle
P. lewyana
P. sextuberculata
P. unifilis — yellow-spotted river turtle
P. vogli

Natural feeding ecology

Several Podocnemis are strongly herbivorous or frugivorous as adults. Giant Amazon river turtles consume fruits, seeds, flowers, roots and soft vegetation from seasonally flooded forests. Yellow-spotted river turtles use floating and submerged vegetation heavily and also consume fruit. Juveniles may be more opportunistic.

Captive diet

For herbivore-leaning Podocnemis, emphasize aquatic plants, leafy vegetation, appropriate riparian fruits and seeds in moderation, and a formulated diet chosen for lower-protein omnivore/herbivore use. Do not feed them like snapping turtles. Peltocephalus and Erymnochelys require their own natural-history refinements and should not simply inherit the Podocnemis formula.

Frequency / When / Where / How

Frequency: Juveniles commonly daily; adults may receive plant foods frequently with concentrated foods several times weekly.
When: Daytime and in relation to seasonal river activity.
Where: In water; floating leaves and fruits can encourage natural surface foraging.
How: Offer whole leaves, aquatic plants and modest fruit pieces rather than a high-protein pellet-only diet.

16. Australasian Long-Necked and Short-Necked Turtles

Species included

This chapter covers common captive representatives of the family Chelidae, including long-necked turtles such as Chelodina longicollis and short-necked turtles such as Emydura macquarii, Emydura subglobosa, Elseya species, and Myuchelys latisternum. These animals must be separated nutritionally within the chapter because neck form tracks major feeding differences.

Long-necked turtles

Chelodina longicollis and many other snake-necked turtles are carnivorous suction or ambush predators consuming aquatic invertebrates, tadpoles, fish, crustaceans and carrion. They require an animal-prey-based diet.

Short-necked turtles

Emydura macquarii is an opportunistic omnivore; field studies found large amounts of filamentous algae along with carrion, macrophytes and invertebrates. Several Elseya are much more herbivorous as adults, feeding heavily on algae, aquatic ribbon weed, leaves, fruit and other riparian vegetation.

Captive diet

Do not feed all Australian turtles the same way. Long-necks need whole aquatic animal prey and carnivore pellets. Emydura requires both animal and plant foods. Herbivorous Elseya should receive substantial aquatic and riparian plant material with animal foods limited.

Frequency / When / Where / How

Frequency: Juveniles daily; adults several meals weekly, with vegetation available more frequently to herbivore-leaning short-necks.
When: During the natural activity period at appropriate water temperatures.
Where: In water; provide depth and open strike space for long-necked suction feeders.
How: Long-necks: moving/sinking whole prey. Emydura: mixed omnivore presentation. Elseya: floating/riparian vegetation plus limited concentrated foods.

17. Pig-Nosed Turtle — Carettochelys insculpta

Species included

Carettochelys insculpta is the only living species in its family and one of the most highly aquatic freshwater turtles. It is a specialized, conservation-sensitive species and is not an appropriate beginner turtle.

Natural feeding ecology

Adults are opportunistic omnivores with a strong plant and fruit component. Wild foods include fruits, seeds, leaves and flowers of riparian vegetation, submerged aquatic plants, algae, mollusks, crustaceans, insects, fish and carrion. Juveniles use proportionally more small animal prey.

Captive diet

Provide a varied plant-rich omnivore diet: aquatic vegetation, leafy browse, suitable low-acid fruits that approximate riparian fruit, quality pellets, mollusks, crustaceans and other controlled animal foods. A fish-heavy carnivore diet is inappropriate for adults.

Frequency / When / Where / How

Frequency: Juveniles daily; adults several measured meals weekly with plant foods offered frequently.
When: During the warm active period.
Where: Entirely in water; males essentially never leave the water and females leave primarily for nesting.
How: Float fruits/leaves and aquatic vegetation and offer small animal foods separately so intake can be monitored.

Foods and Practices to Avoid Across Groups

Dog food, cat food, hot dogs, lunch meat, seasoned human foods, or bread as routine feed.
Boneless chicken, beef, hamburger, liver, or fish fillet as the nutritional foundation.
Dried shrimp as a complete diet.
One species of feeder fish used continuously.
Wild-caught fish, frogs, tadpoles, snails, crayfish, or insects from uncontrolled environments.
Unrestricted high-protein feeding of adult herbivore-leaning turtles.
Forcing carnivorous softshells, long-necks, or mata matas to eat a slider-style salad.
High-dose vitamin A or vitamin D supplementation without a diagnosed need.
Feeding in chronically cold water or without proper basking/UVB husbandry where required.
Releasing unwanted turtles or aquarium plants into natural waterways.

Salmonella and Food-Hygiene Safety

Healthy turtles can carry Salmonella without appearing ill. Wash hands after handling turtles, food dishes, filters, aquarium water, or enclosure equipment. Do not clean turtle equipment in kitchen food-preparation areas. Children, older adults, pregnant people, and immunocompromised individuals require particular caution.

When to Seek Veterinary Care

Persistent anorexia, weight loss, swollen or closed eyes, aural swelling, nasal discharge, abnormal buoyancy, inability to submerge, soft or distorted shell, shell ulceration, limb swelling, weakness, tremors, neurologic signs, abnormal feces, or inability to climb onto the basking area should prompt examination by a veterinarian experienced with reptiles. Dietary correction alone is not adequate treatment for established metabolic, infectious, renal, hepatic, or reproductive disease.

Selected References

Turtle Taxonomy Working Group. 2025. Turtles of the World: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status. 10th ed. Chelonian Research Monographs 10:1–575.
The Reptile Database. Current taxonomy pages for Trachemys, Pseudemys, Chrysemys, Graptemys, Kinosternidae, Chelydridae, Apalone, Pelomedusa, Pelusios, Podocnemididae, Mauremys, Rhinoclemmys, and related genera. Accessed August 2026.
Merck Veterinary Manual. Nutrition in Turtles. Full review September 2025.
Merck Veterinary Manual. Nutrition in Reptiles. Full review September 2025; updated October 2025.
Merck Veterinary Manual. Nutritional, Metabolic, and Endocrine Diseases of Reptiles.
LafeberVet. Care of Aquatic & Semi-Aquatic Turtles. Client education handout.
Pollock C, Donoghue S. LafeberVet. Basic Information Sheet: Red-Eared Slider.
Bouchard SS, Bjorndal KA. Ontogenetic diet shifts and digestive constraints in the omnivorous freshwater turtle Trachemys scripta. Physiol Biochem Zool. 2006.
Bulté G, et al. Trophic morphology and diet differences in northern map turtles, Graptemys geographica. Functional Ecology. 2008.
Spencer RJ, Thompson MB, Hume ID. The diet and digestive energetics of an Australian short-necked turtle, Emydura macquarii. Comp Biochem Physiol A. 1998.
U.S. National Park Service, U.S. Fish & Wildlife Service, NatureServe, Canada Species at Risk, Queensland Government, Australian DCCEEW, Animal Diversity Web, and IUCN/TFTSG species accounts cited for natural-history and feeding ecology.