Can Turtles Eat Tuna? Discover the Facts!

Turtles kept as pets have unique dietary needs. Their food should provide balanced nutrition to keep them healthy and active.

As omnivores, turtles can eat a varied diet including vegetables, fruits, and proteins. Fish can be an excellent source of protein for aquatic turtles. This leads many turtle owners to wonder: can turtles eat tuna?

Tuna is a popular fish for human consumption and can be readily purchased at most grocery stores. It’s a lean source of protein and omega-3 fatty acids. But is it safe and nutritious for turtles?

This article provides an overview of the key considerations around feeding tuna to pet turtles. We’ll explore the nutritional value of tuna, benefits and risks, proper portion sizes, and best practices for including tuna as part of a balanced turtle diet.

Turtles as Pets

Pet Turtles

Turtles are a popular choice of pet and have been kept as companion animals for many years. Their small size, relative ease of care, and long lifespans make them appealing to reptile enthusiasts and families alike.

The most common species of turtles kept as pets include:

  • Red-eared slider – This semi-aquatic turtle is arguably the most popular pet turtle. They stay small enough to be housed indoors and have outgoing, active personalities.

  • Box turtle – Box turtles are friendly, gentle reptiles that make great pets. Their terrestrial nature enables them to live happily in indoor enclosures.

  • Painted turtle – Hardy and easy to care for, painted turtles adapt well to life in captivity. Their attractive red, yellow, and black markings also make them fun to watch.

  • Musk turtle – Small musk turtles only grow to around 5 inches, making them ideal for pet owners with limited space. Despite their small size, they have big appetites and lively personalities.

  • Snapping turtle – While not recommended for novice reptile owners, snapping turtles can make for interesting pets. However, they require extensive space and specialized care.

With proper habitat setup, lighting, heating, nutrition, and handling, turtles can live for decades in captivity. Their ancient looks and peaceful temperaments explain why they remain beloved pets today.

Turtles as Omnivores

Turtles are omnivores, meaning they eat both plants and meat. As reptiles, turtles have evolved to consume a varied diet from both the plant and animal kingdoms. Their natural habitats contain diverse food sources, allowing turtles to obtain nutrients from vegetation, insects, mollusks, and small fish.

A turtle’s status as an omnivore gives it dietary flexibility to thrive in aquatic and terrestrial environments. Species like the red-eared slider inhabit ponds teeming with vegetation as well as small invertebrates to hunt. Box turtles in woodland areas consume berries and foliage while also eating worms, slugs, and carrion.

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Turtles employ jaws suited for tearing, biting, and chewing both plant and animal matter. Their digestive systems can break down the cellulose in plant cell walls as well as process the proteins obtained from an insect or fish. Being omnivorous provides nutritional balance and allows turtles to survive in locales where food sources may be scarce or seasonal.

Overall, the omnivorous diet of turtles allows them to consume diverse food items, gain a wide spectrum of nutrients, and adapt to changing environments and food availability. Their evolutionary physiology equips them to process and thrive on mixed plant and animal diets.

Can Turtles Eat Fish?

Turtles Fish Food

Yes, most turtles can safely and healthily eat fish as part of a balanced diet. Fish have nutritional benefits for turtles, providing important protein, essential fatty acids, amino acids, vitamins, and minerals that support growth and shell health. Some fish varieties are especially recommended over others for pet turtle diets.

While turtles mainly eat plants and vegetables like leafy greens, many species are omnivores that enjoy and benefit from occasional fish treats. Both aquatic and land-dwelling turtles can eat fish. The essential nutrients and lean protein in fish balance out a turtle’s diet, adding diversity for optimal health.

As long as fish is not the main part of a turtle’s diet, and other sources of protein and produce are incorporated, fish offers a great natural supplement. However, some discretion is required to ensure the fish you feed is safe, fresh, and size appropriate for your turtle. Guidelines and precautions apply to make fish feeding healthy. Moderation and proper preparation is key.

Nutrition Facts of Tuna

Tuna Nutrition

Tuna is a nutritious source of protein and healthy fats for both humans and animals.

Here are some of the key nutrients found in tuna:

  • High in Protein – A 3 ounce serving of light tuna contains about 22 grams of protein. Tuna is an excellent source of high-quality protein that provides amino acids that support growth and maintenance in the body.

  • High in Omega-3s – Tuna contains beneficial omega-3 fatty acids like DHA and EPA. These healthy fats support brain development and function, heart health, and offer anti-inflammatory effects. Canned tuna can have 300-500 mg per serving.

  • Low in Saturated Fat – Compared to red meats, tuna is low in saturated fat. A 3 ounce serving of light tuna only has about 1 gram of saturated fat. This makes tuna a healthier protein source.

The impressive protein content along with omega-3s from tuna can make it a great occasional supplemental food for turtles. It provides nutrients that support a turtle’s health. The low saturated fat content also makes it easier for turtles to digest compared to fattier options. When fed in moderation, tuna can be a nutritious protein boost.

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Benefits of Feeding Tuna

Tuna can be a beneficial food source for turtles for several key reasons:

  • Protein – Tuna is a great source of protein for turtles, providing components like amino acids that are important for building strong muscles, tissues, and shell. Many turtle keepers recommend providing some amount of protein for a balanced diet. Fish like tuna offer high-quality, lean protein.

  • Healthy Fats – The oils in tuna provide healthy omega-3 fatty acids like DHA. These fats support brain development and function for turtles. The oils also promote skin and shell health.

  • Vitamins and Minerals – Tuna contains a variety of vitamins and minerals that turtles need – vitamin A for vision, B vitamins for metabolism, vitamin D for bone health, selenium for antioxidant protection, and more. These nutrients contribute to all aspects of a turtle’s health.

  • Palatability – Most turtles really enjoy the taste of tuna. The scent and flavor can encourage picky eaters to eat. This makes tuna a good occasional treat to stimulate appetite.

  • Convenience – Tuna is an easy protein addition for turtles. Canned tuna is inexpensive, readily accessible at any grocery store, and requires no prep or cooking before feeding to turtles. Fresh tuna can also be cut into bite-size pieces.

Risks of Feeding Tuna

Red Eared Sliders

While tuna can be a healthy part of a balanced diet for turtles, there are some risks to be aware of:

  • Mercury levels – Like many large, predatory fish, tuna contains high levels of mercury. When tuna is fed as a regular part of a turtle’s diet, mercury can accumulate in the turtle’s body over time and become toxic. Mercury poisoning in turtles can cause neurological damage, liver and kidney failure, and even death. It’s important to limit tuna to an occasional treat.

  • Lacking nutrients – While tuna contains beneficial omega-3s, it is relatively low in some key nutrients turtles need like vitamin E, calcium, and fiber. Relying too heavily on tuna could lead to nutritional imbalances and deficiencies over time. Tuna should be part of a varied diet including vegetables, fruits, and other proteins.

It’s best to feed tuna to turtles only 1-2 times per month as part of a balanced diet. This limits mercury exposure while still allowing turtles to benefit from tuna’s positive attributes. Variety is key when feeding any omnivorous turtle.

How Much Tuna to Feed

Tuna should only be an occasional treat for turtles, not a regular part of their diet. While tuna can provide some beneficial nutrients, it also contains a high amount of protein and fat compared to greens and vegetables.

It’s recommended to limit tuna to only 1-2 times a month for your turtle. When you do provide tuna, only offer a small quantity. For an adult turtle, start with just 1-2 bites of tuna, which is about 1/8 to 1/4 cup. See how your turtle reacts and if they have any digestive issues before considering offering more.

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For baby or juvenile turtles, provide even less tuna since their bodies are much smaller. Try starting with just a fork tip’s worth of tuna, then gradually increase over time as they grow.

Overfeeding tuna can lead to obesity and other health problems in turtles. It’s best to keep it as an infrequent snack. Focus on quality turtle pellets, leafy greens, vegetables, and occasional fruits as the bulk of your turtle’s diet.

Best Practices

Turtle Shell Care

When offering tuna to pet turtles, follow these best practices:

  • Choose tuna packed in water, not oil, to reduce fat content. Drain and rinse the tuna before feeding.

  • Chop or mince the tuna into bite-sized pieces for easier eating. Cut away any bones, which could pose a choking hazard.

  • Feed tuna in moderation 1-2 times per week at most. It should be an occasional treat, not a staple of their diet.

  • Mix a small amount of tuna into your turtle’s regular food rather than offering tuna alone. This prevents an unbalanced diet.

  • Avoid light tuna, which tends to be higher in mercury. Instead choose skipjack or young yellowfin tuna, lower in mercury.

  • Don’t feed tuna that smells bad or is past expiration date. This could cause food poisoning in turtles.

  • Wash hands before and after handling raw tuna to prevent bacteria transfer. Also thoroughly clean any surfaces touched by raw tuna.

  • Remove any uneaten tuna within 15 minutes after feeding, as it will spoil in the tank water. Don’t leave sitting out overnight.

  • Never feed tuna daily or in large quantities. Overfeeding protein can cause shell and bone issues in turtles.

Following these tips will help make tuna an occasional treat both turtles and owners can enjoy safely. Be sure to consult your vet too.


In summary, turtles can eat tuna in moderation as an occasional treat. Tuna contains beneficial nutrients like protein, omega-3 fatty acids, vitamin A, and more. However, tuna also contains risks like heavy metals, sodium, and unsaturated fat.

Turtles can safely eat tuna 1-2 times per month in small quantities. Avoid tuna packed in oil or saltwater, and drain the liquid before feeding. Chop tuna into bite-size pieces no larger than the turtle’s head. Always feed tuna along with the turtle’s usual balanced diet.

By carefully preparing and monitoring tuna intake, the benefits of nutrients can be harnessed while reducing potential health risks. Variety and moderation are key when feeding tuna or any human foods to pet turtles. It’s best to consult an exotics veterinarian if you have any concerns over your turtle’s unique nutritional needs.

Samantha Jenkins
Samantha Jenkins

I am Samantha Jenkins, a devoted turtle enthusiast and conservationist. My love for nature and my special connection with turtles have shaped my life's purpose. In my free time I like to travel and hang out with friends!

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