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Salmon, tuna, and halibut are the fish most likely. to cause allergic reactions, but it is recommended. that individuals with any fish allergies avoid all fish. The term fish encompasses all species of finned fish, which can cause severe allergic reactions. The. protein from the fish flesh is most likely to cause an. allergic reaction, but fish gelatin and fish oil (which is. often less refined and may contain traces of fish.
Tuna is relatively high on the food chain and therefore contains higher amounts of mercury than other fish, leading to an increased risk of mercury poisoning. Tuna is also high in unsaturated fats. While it is healthy for humans to choose unsaturated fats in their diet, too much can be bad for cats.Consuming too much tuna can cause your cat to develop a Vitamin E deficiency, leading to an inflammation of the fatty tissue, a condition known as steatitis (âyellow fat diseaseâ).ish is a great source of protein, but there are a few reasons why a steady diet of human-grade canned tuna can cause health problems for your cat. Tuna alone is not nutritionally complete, and many cats are allergic to fish.