Tilapia — Food safety facts
Safe to share · Cats · full breakdown on the linked food page
A mild white fish that is safe cooked and unseasoned.
The full verdict, portion guidance and serving notes are collected on the Tilapia food facts page.
Short answer
No need for concern — plain, cooked tilapia is a safe and mild fish for cats to eat in small amounts. It's a good source of protein, and as long as it was unseasoned and boneless, a little taste is fine. There's no risk to your other pets who didn't eat any, so you don't need to monitor them. Just offer your cat some fresh water and continue with their normal routine; call your own vet only if you notice any unexpected vomiting or diarrhea later on.