Can Cats Eat Tuna And Salmon

Many cat owners know that felines often go wild for fish. Tuna and salmon are two of the most common fish offered as treats or added to commercial cat foods. But are these fish truly safe for your cat? While they can be given in moderation, there are important health risks to consider. This article provides evidence-based guidance from leading veterinary organisations to help you make informed decisions about feeding tuna and salmon to your cat.

Quick Q&A: Common Questions

Question: Is it safe to feed my cat tuna or salmon every day?

Answer: No. Daily feeding of tuna or salmon can lead to mercury accumulation, thiamine deficiency, and nutritional imbalances. Both fish should only be offered as occasional treats (no more than once or twice per week) and must be cooked (if fresh) and unseasoned. Always consult your veterinarian before making any significant dietary changes.

Nutritional Considerations for Cats and Fish

The Appeal of Fish for Cats

Cats are obligate carnivores, meaning they require animal-based protein to thrive. The strong odour and flavour (or flavour) of fish naturally attract many cats, making tuna and salmon popular ingredients in commercial diets and homemade treats. However, fish-based diets are not biologically appropriate for cats when fed exclusively.

Essential Nutrients vs. Risks

Fish provides high-quality protein, omega-3 fatty acids (EPA and DHA), and certain vitamins. Yet fish lacks several nutrients that cats need, such as taurine and arachidonic acid, which must be supplied from other sources. The American Veterinary Medical Association (AVMA) and the American Animal Hospital Association (AAHA) caution that feeding fish as a primary diet ingredient can lead to deficiencies unless the food is fully balanced.

Tuna: Benefits and Dangers

Mercury Accumulation

Tuna, particularly larger species like albacore, accumulates methylmercury in its flesh. Chronic exposure can cause mercury toxicity in cats, leading to neurological signs such as trembling, incoordination, and vision loss. The U.S. Food and Drug Administration (FDA) advises limiting tuna intake for humans, and the same principle applies to pets. The Canadian Veterinary Medical Association (CVMA) recommends avoiding tuna as a staple food.

Thiamine Deficiency

Tuna contains an enzyme called thiaminase, which breaks down thiamine (vitamin B1). A diet heavy in raw or improperly processed tuna can cause thiamine deficiency. Symptoms include loss of appetite, vomiting, diarrhoea (or diarrhea), and severe neurological issues like seizures and ataxia. The European Federation of Veterinarians (FVE) and the European Medicines Agency (EMA) highlight thiamine deficiency as a key risk when feeding raw fish.

Addiction and Preference

Cats can develop a strong preference for tuna, leading them to reject nutritionally complete cat food. This behavioural (or behavioral) issue can result in malnutrition over time. The Australian Veterinary Association (AVA) warns that fish-based diets often lead to picky eating.

Salmon: A Healthier Option?

Raw Salmon and Parasites

Raw salmon may contain parasites such as Neorickettsia helminthoeca, which causes salmon poisoning disease in dogs but can also affect cats. Signs include fever, vomiting, diarrhoea, and swollen lymph nodes. Freezing does not reliably kill all parasites; cooking to an internal temperature of at least 63°C (145°F) is essential. The AVMA strongly advises against feeding raw or undercooked salmon to cats.

Cooked Salmon Benefits

When fully cooked and unseasoned, salmon is a good source of omega-3 fatty acids that support skin and coat health, reduce inflammation, and may benefit kidney function. However, it should still be given as a treat, not a meal replacement. The CVMA notes that salmon oil supplements are safer than whole fish for obtaining these fatty acids.

Salmon Oil as Supplement

Salmon oil is refined to remove contaminants and is a concentrated source of DHA and EPA. It carries lower risks of mercury and thiamine problems. The AVA recommends salmon oil as a preferable alternative to whole salmon for long-term use.

Safe Feeding Guidelines

How Much is Too Much?

For an average 4 kg (9 lb) cat, a heaped teaspoon of cooked, boneless tuna or salmon once or twice per week is a safe limit. Never exceed 10% of daily calorie intake from treats. The FVE/EMA guidelines suggest that fish-based treats should be balanced with a complete commercial diet.

Preparation Methods

• Always cook fresh or frozen fish thoroughly (no pink flesh).
• Remove all skin and bones; small bones can cause choking or gastrointestinal perforation.
• Avoid any seasoning, especially garlic, onion, or salt.
• Canned tuna should be packed in water (not oil or brine) and be of low-mercury varieties (skipjack or light tuna).

When to Visit the Vet

Signs that warrant a veterinary (or vet) examination include:

• Vomiting, diarrhoea, or constipation after eating fish.
• Lethargy, weakness, or reluctance to move.
• Neurological signs such as head pressing, circling, or seizures.
• Loss of appetite lasting more than 24 hours.

If you suspect thiamine deficiency or mercury toxicity, immediate veterinary care is critical. Blood tests and supportive therapy may be needed.

Prevention and Long-Term Management

The healthiest diet for most cats is a complete, balanced commercial food formulated by a veterinary nutritionist. If you wish to include fish, treat it as an occasional supplement, not a dietary staple. Rotate protein sources (chicken, turkey, rabbit) to reduce the risk of food sensitivities and nutritional imbalances.

The AAHA/AVMA joint statement on feline nutrition emphasises that pet owners should consult their veterinarian before introducing any non-commercial food. The CVMA and AVA echo this recommendation, especially for cats with kidney disease, hyperthyroidism, or allergies.

In summary, cats can eat tuna and salmon, but only as occasional cooked treats. The risks of mercury, thiamine deficiency, and nutritional imbalance outweigh any benefits when these fish are fed regularly. Stick to a high-quality commercial diet and use fish sparingly to keep your cat healthy and happy.