reptile

Cooter Turtle

Pseudemys concinna (river cooter) / Pseudemys floridana (Florida cooter) — both sold under the common name

Cooters are close relatives of the red-eared slider and share most of the same basic aquatic-turtle husbandry — basking platform, UVB, filtered water, the same core setup this site covers in depth on the slider's page — but two facts make them a genuinely different keeping proposition rather than an interchangeable substitute. First, they run larger: a mature female cooter regularly outgrows a mature female slider, and the eventual tank and filtration needs scale up accordingly, on top of an already-substantial commitment. Second, and more distinctively, adult cooters are among the most strongly herbivorous of the commonly kept basking turtles — where a slider's diet shifts toward roughly half plant matter by adulthood, a cooter's shifts much further, with a well-supported adult diet running 80-95% aquatic vegetation and leafy greens and only a small remaining share of protein. Feeding a cooter like a slider, with a persistently protein-heavy diet carried into adulthood, is one of the more common and avoidable husbandry mistakes specific to this species, linked to shell pyramiding and kidney strain in ways that mirror concerns seen in other reptiles fed against their natural dietary balance. Juveniles are more omnivorous than adults, similar in direction to a slider's own juvenile-to-adult shift, but the transition toward heavy herbivory happens faster and goes further in a cooter than it does in its more famous slider relative.

Husbandry

Enclosure size

Minimum 10 gallons of water per inch of shell length as a starting baseline (the same rule used for red-eared sliders), but a mature female cooter's larger adult size means the practical tank volume needed regularly exceeds 125 gallons

Source: Merck Veterinary Manual — Chelonian Husbandry (checked 2026-07-13)

Temperature gradient

Basking platform 88-95°F (31-35°C); water temperature 74-78°F (23-26°C), similar to a slider's range

Source: Association of Reptilian and Amphibian Veterinarians (ARAV) husbandry guidance (checked 2026-07-13)

UVB lighting

10-12% UVB tube positioned over the basking platform with no glass or plastic in the light path, replaced every 6-12 months

Source: UVGuide UK / ARAV lighting guidance (checked 2026-07-13)

Diet

Juveniles: a more balanced mix of commercial turtle pellets, occasional feeder fish or insects, and aquatic plants. Adults: shift decisively toward 80-95% aquatic vegetation and leafy greens (romaine, dandelion, aquatic plants like anacharis and duckweed), with only a small remaining share of protein — a considerably more herbivore-leaning adult diet than a red-eared slider's

Source: Merck Veterinary Manual — Chelonian Nutrition (checked 2026-07-13)

Supplementation

Cuttlebone or a calcium block available at all times, with particular attention to calcium given how plant-heavy the adult diet is

Source: ARAV husbandry guidance (checked 2026-07-13)

Cohabitation

Can be kept in groups with generous space and multiple basking spots, but the larger adult body size of this species means overcrowding becomes a problem at a smaller headcount than it would with sliders in the same tank footprint

Source: Merck Veterinary Manual — Chelonian Husbandry (checked 2026-07-13)

Handling

Cooters share the same limited handling tolerance as red-eared sliders — they are not a cuddly species, and can scratch or bite defensively when lifted. Their larger adult size makes proper two-handed support even more important than with a slider of the same age, since an unsupported large cooter is both heavier and stronger, and a slipping grip risks a fall injury to the shell or plastron that a smaller, lighter slider would be less likely to sustain from the same drop height. As with any aquatic turtle, thorough hand-washing after handling or tank maintenance is a genuine hygiene requirement given the well-documented Salmonella risk associated with the group, and this applies equally regardless of how healthy a specific cooter appears on the surface. Most cooters do settle into recognizing a consistent feeding routine and keeper presence over time, showing anticipatory swimming at feeding time, without ever becoming a genuinely handling-tolerant pet in the way a bearded dragon or blue-tongue skink can be. Because cooters are less commonly sold than red-eared sliders, a prospective keeper may need to seek out a specialist breeder or a reptile-focused rescue rather than a general pet-store hatchling bin, and a rescued adult cooter — not an uncommon outcome once an owner realizes how large this species eventually gets — often benefits from an early veterinary check to catch any diet-related shell or kidney issues carried forward from a previous, slider-style feeding regimen.

Signs of good health

• Hard, evenly colored shell with no soft spots or flaking beyond normal scute shedding
• Clear eyes with no swelling, a classic vitamin A deficiency sign in aquatic turtles fed too little plant matter
• Active swimming and consistent basking behavior on a platform sized for this species' larger adult body
• Steady appetite for offered vegetation, with normal buoyancy and no floating to one side
• Clean nares with no bubbling or discharge

Common problems

14 common reptile problems are tracked for this species; 0 have full guides published so far.

Recommended gear for this taxon

Equipment categories that are genuinely correct for this species' welfare needs — see the full Gear Guide for the complete list.

Some links below are Amazon Associates / Chewy affiliate links — Keepers Guide may earn a small commission on qualifying purchases, at no extra cost to you. We only recommend equipment categories that are genuinely correct for the species' welfare needs; we never recommend a product because of the commission.