Flounder

Flounder is a white ocean fish used as a named protein in a few cat foods. The FDA places flounder in its best choices group for low mercury in its fish advice for people. Like other fish, it can trigger a food allergy in some cats. If your cat has a medical condition or a known fish allergy, ask your veterinarian before choosing a food with flounder.

Source: fda.gov

Flounder adds lean, easily digested animal protein. Pettings groups it with cod, haddock, pollock and sole as a white fish that carries trace minerals such as iodine and selenium. Cornell Feline Health Center explains that cats are obligate carnivores and rely on nutrients found only in animal products. A named fish on the label tells you the exact source.

Source: vet.cornell.edu

No, flounder is a low-mercury fish. In its advice about eating fish, the FDA lists flounder among the best choices, the group with the lowest mercury levels. That guidance was written for people, but it shows where flounder sits compared with other seafood. Large predatory fish, such as king mackerel, are at the opposite end of the chart.

Source: fda.gov

Yes, flounder is a flatfish. It lives on the sea floor and has both eyes on one side of its head. Its flesh is white, mild and lean, which is why Pettings treats it like cod, haddock and sole. In cat food it usually appears in fish-based recipes alongside other ocean species rather than on its own.

Pettings gives flounder 5 out of 5 and lists it as a named animal protein. It appears on 1 of the 149 dry cat foods we list, so it is rare in dry food. The score rates the ingredient only. Each food's page shows how the whole recipe scores overall.