Red-Eared Slider

Is a red-eared slider right for you?

For decades the red-eared slider (Trachemys scripta elegans) was sold as a palm-sized hatchling in a small plastic tub. That picture is completely misleading. This turtle grows, lives for decades, needs a large tank with powerful filtration and, because it is an invasive species, its trade is banned in the EU, Turkey and a number of other places.

Before you adopt

Legal status. In the European Union, Trachemys scripta (all subspecies) has been on the list of invasive alien species of Union concern since 2016: importing, selling, breeding and releasing it are prohibited. Owners who already had a pet slider before the listing may keep it for its natural life, provided they prevent breeding and escape. In Turkey the species is not native, is treated as invasive by the nature conservation authority, and import and sale are banned; shops still sell them illegally, and in February 2026 turtles seized from shop shelves in Bursa were sent to a wildlife rehabilitation centre. Rules differ elsewhere, so check your local law. If you see sliders for sale where they are banned, report it rather than buy one.

"It stays small" is a myth. Hatchlings are a few centimetres long but grow quickly. According to the RSPCA, females reach a shell length of about 25 cm and males about 21 cm; released individuals measured in Turkey range from 12 to 28 cm. A small tub does not stop growth, it only makes the turtle ill.

A long life. Sliders have been reported living 30-40 years in captivity.

Never release one into the wild. Owners dumping grown turtles into lakes and park ponds is the main way this species spreads. Established populations now exist in wetlands across Europe and Turkey. Sliders compete with native species such as the European pond turtle (Emys orbicularis) for nesting sites, food and basking spots, eat the eggs of native species and affect frogs, fish and insects. If you cannot keep your turtle, contact a reptile rescue or your wildlife authority.

Tank set-up

Water volume The RSPCA recommends about 80 litres of water per 5 cm of shell length, so a 25 cm adult needs roughly 400 litres. VCA advises water depth of at least 1.5-2 times shell length and a swimming area 4-6 times shell length.

Basking area A dry platform covering 15-25% of the surface area, with an easy ramp out of the water.

Water heaters must be guarded and thermostat-controlled, and temperatures checked daily. Sudden temperature swings impair immunity and digestion. In hot summers, direct sun through a window can overheat a tank quickly; keep it out of direct sunlight.

UVB

• A 7-12% UVB tube with a reflector, covering at least two-thirds of the tank.
• No glass or plastic between lamp and turtle; distance typically 30-45 cm.
• UVB output fades even while the tube still lights; replace per the manufacturer (VCA: about every 6 months).
• 12 hours on, 12 hours off.

Filtration and water care Sliders produce a lot of waste. Use a strong filter rated well above the tank volume. The RSPCA suggests weekly 20% water changes, VCA 50%; either way, test for ammonia and nitrite. Avoid gravel and small stones, which can be swallowed and cause blockages; a bare floor or fine sand is better.

Keep heat and light cycles constant; VCA advises against letting pet aquatic turtles hibernate.

Feeding

Sliders shift from mostly carnivorous to omnivorous as they age.

Hatchlings and juveniles: Fed daily; about two-thirds of the diet animal protein (quality turtle pellets, insects, earthworms, thawed freshwater fish).

Adults: Fed every 2-3 days; animal protein drops to about half, the rest greens and aquatic plants. The RSPCA suggests offering what the turtle eats in 5 minutes and netting out leftovers. Sliders overeat readily; obesity and too-rapid growth cause disease.

Suitable: Quality turtle pellets, dark leafy greens (kale, collards, endive, dandelion), red bell pepper, carrot tops, aquatic plants such as duckweed and elodea, earthworms, locusts.

Do not feed: Iceberg lettuce (little nutrition; contributes to vitamin A deficiency), raw supermarket meat or chicken, processed foods such as sausage or bread, wild-caught fish or frogs (parasite risk), an all-meat diet.

Supplements: Keep cuttlebone in the tank for calcium; a weekly multivitamin if your vet recommends it. With good UVB, high dietary vitamin D3 is not needed.

Feeding in a separate container helps keep the main tank water clean.

Health and lifespan

Sliders can live 30-40 years in captivity; poor husbandry shortens this dramatically. Have a new turtle checked by a reptile vet within the first weeks, including a faecal parasite test.

Common problems:

• Vitamin A deficiency: Swollen, closed eyes with discharge, ear swellings (abscesses), loss of appetite. Usually caused by a monotonous or iceberg-lettuce diet. A turtle with closed eyes that is not eating needs a vet promptly.
• Respiratory infection: Bubbles or mucus from mouth and nose, wheezing, breathing with neck stretched or mouth open, listing to one side when swimming. Often linked to cold or dirty water; needs urgent veterinary care.
• Metabolic bone disease: Soft, rubbery or unevenly growing shell, deformed legs. Caused by lack of UVB or calcium.
• Shell rot and shell infections: Pitting, bad smell, ulcers. Constant wetness, poor water quality and injuries contribute.
• Internal parasites: Often no signs; weight loss and diarrhoea can occur.

Salmonella: Turtles can carry and shed Salmonella while looking perfectly healthy. Wash your hands after every contact, feeding and tank cleaning; do not empty tank water into the kitchen sink or bathe the turtle there. Children under 5, pregnant women, older people and anyone with a weakened immune system are most at risk.

Handling and behaviour

Sliders are fascinating to watch but do not enjoy being held. Limit handling to health checks, weighing and cleaning.

1. Hold the shell from both sides. This stops the turtle turning to bite; adults can bite hard.
2. Do not handle hatchlings. They are fragile and stress easily.
3. Wash your hands straight away.

Reading behaviour:

• Long basking sessions: Normal; the turtle warms up and dries its shell.
• A male fluttering his front claws in front of a female's face: Courtship.
• Staying at the surface or listing to one side: Possible respiratory problem; see a vet.
• Keeping several together: They can become aggressive when overcrowded. Do not house them with fish, which they will hunt.

History and life in the wild

The red-eared slider is a semi-aquatic, day-active turtle native to the Mississippi basin and southern United States. When it senses danger it slides quickly off its basking log into the water, which gives it the name "slider".

For many years it was one of the world's best-selling pet reptiles, and released pets have established populations in many countries. That is why its trade is now banned in the EU and Turkey: the problem is not the turtle itself, but that it was marketed as small and easy and then abandoned.