Cat ate my beta fish, will he be ok?

Okay well my cat ate my beta fish one day while I was at school and I was wondering if it would do any harm to my cat. He was acting really strange for a couple days after he ate it. I didn't know if there were certain toxins in the fish that would have cause some changes in behavior. Any ideas??

Your cat will be fine. They like fish. Sorry to hear about your pet beta fish, when my kids lost their beta ( we had it for almost two years) they were very sad & cried.