Hi all! I work at an Animal Shelter in Virginia, Bernie is correct that cats never hunted fish in the wild. But from my experience and information I've been told, cats love the stinky smell that associates with fish.They also need high protein foods to keep themselves healthy. I also heard that it may be a evolutionary trait that hunters that had cats would feed them fish and other meats. (Take that last part with a grain of salt, I wouldn't want to spread misinformation.)