A large, hardy basking turtle of the American Southeast, the yellow-bellied is a subspecies of the pond slider distinguished by yellow facial blotches and a yellow plastron. Cheap to buy but large, long-lived, messy, and invasive outside its range — a serious long-term commitment.
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Sexually dimorphic: males ~13-23 cm, females larger at 20-33 cm (8-13 in) carapace
Lifespan
30–40 years
Social needs
solo
Native region
Southeastern United States (Atlantic coastal plain, Virginia to Florida)
Origin
New World
Climate
⛅ Subtropical
Water type
💧 Freshwater
Family
Emydidae
Genus
Trachemys
Part of the Freshwater turtles
Aquatic and semi-aquatic turtles kept in heated, filtered aquariums or ponds with basking areas, UVB, and clean water — from tiny musk turtles to large sliders.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Adult aquarium
75–90 gal (10 gal per inch)
Trachemys scripta scripta reaches 8–13 in. Minimum is a 75–90 gal aquarium with strong filtration, large basking dock, basking 32 °C, 5–10% UVB, water 22–26 °C. Highly aquatic active swimmers.
Photo coming soon
Recommended
Larger aquarium
125 gal+ planted
A 125-gal+ aquarium with oversized canister filtration, large basking dock, and robust plants. Sliders are voracious — overfilter to manage waste.
Photo coming soon
Ideal
Outdoor pond (seasonal)
Outdoor predator-proof pond, ≥ 300 gal
Seasonal outdoor predator-proof pond with basking dock, shade, and shoreline. Best welfare for a long-lived (30+ year) species that outgrows nearly all indoor setups.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg / Neonate
Most reptiles lay leathery- or hard-shelled eggs incubated by ambient warmth, though some snakes and lizards give live birth. Incubation temperature can influence sex and development in many species.
Photo coming soon
Hatchling
Hatchlings emerge as fully formed miniatures of the adult, often using an egg tooth to slit the shell. They are independent from birth but small and vulnerable, and may show brighter or different juvenile patterning.
Photo coming soon
Juvenile
Juveniles grow steadily, shedding their skin periodically as they enlarge. Coloration and proportions shift toward the adult form, and growth rate depends heavily on temperature, diet, and basking/UVB access.
Adult
Adults reach the species' full length and mass and become sexually mature. Many reptiles show sex differences in size, coloration, or features (such as larger heads, hemipenal bulges, or femoral pores), and continue to shed throughout life.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Natural
representative
Yellow-bellied slider (T. s. scripta)
Nominate subspecies with a broad yellow blotch behind the eye, yellow vertical bars on the shell, and a mostly yellow plastron with few markings. Native to the southeastern Atlantic coastal plain.
Habitat & enclosure
Strongly aquatic with heavy basking needs. An adult requires a very large setup: minimum ~340 L (90 gallons) for a male and 450+ L (120+ gallons) or a stock tank/pond for a female — the common '10 gallons per inch of shell' guideline applies. Deep water for swimming plus a large dry basking platform. Water 24-27°C (75-80°F), basking spot 32-35°C (90-95°F). UVB is mandatory. They are powerful, active, and outgrow small tanks quickly.
Substrate
Bare-bottom is easiest to keep clean for a large messy turtle; otherwise large smooth river rocks. Avoid small swallowable gravel (impaction risk). Heavy filtration and routine water changes matter far more than decorative substrate.
Equipment & setup
Oversized canister filtration (2x+ turnover), submersible heater, strong T5 UVB (10.0/12%) over the basking area, and a basking heat lamp reaching 32-35°C. A large, sturdy, fully drying basking dock that supports the adult's weight. Thermometers and a routine for frequent partial water changes.
Diet
Omnivore that shifts from carnivorous juvenile to more herbivorous adult. Base diet of quality aquatic-turtle pellets; add protein (earthworms, snails, insects, lean fish, occasional thawed pinky) and increasing plant matter for adults — leafy greens, duckweed, anacharis, water lettuce. Provide cuttlebone/calcium. Feed juveniles daily; adults every 2-3 days and watch for obesity.
Behavior & temperament
Bold and active compared with shyer map turtles; readily learns to beg at feeding time. Generally not aggressive to keepers but will bite if mishandled and dislikes restraint — a display animal rather than a cuddly pet. Males may pester or harass tankmates and can injure smaller turtles, so housing alone is usually best.
Health
Robust but prone to husbandry-related disease: shell rot and fungal/bacterial infections from poor water or inadequate basking, vitamin A deficiency (swollen eyes), respiratory infection from cold water, and metabolic bone disease without UVB/calcium. Like all turtles they can shed Salmonella — wash hands and keep tank access away from very young children. Pristine water and a fully drying basking site prevent most problems.
Tips, DIY & hacks
Buy only captive-bred and plan for an adult female's size before purchase — most welfare problems come from undersized tanks. NEVER release a slider outdoors: Trachemys scripta is among the world's worst invasive reptiles, and the entire species (including the yellow-bellied subspecies) is banned from sale, breeding, and keeping under EU Invasive Alien Species rules. In the US, the FDA bans sale of any turtle under ~10 cm (4 in) carapace to curb Salmonella; releases also devastate native turtles through competition and hybridization. Provide pond-scale housing long term and rehome through a rescue rather than release.
