Is feeding raw fish to cats safe?

Feeding excessive amounts of raw fish to cats may be detrimental because it contains thiaminase. Thiaminases are enzymes which break down Thiamin (Vitamin B1). However thiaminases are destroyed in the cooking process. As Burns is an extruded food this is not something that would harm the cat.

If oily fish is fed excessively then the cat may become deficient in Vitamin E. Vitamin E is used up when the oils begin to go rancid.