It's not the fact that they fish as a hobby. Lots of women fishers too.

It's the fact that it's not an appropriate pic for a profile unless it's for a fishing magazine or something like that.

Are you trying to date a fish?

Are you offering up that fish in trade for sex?

Are you trying to wingman for the fish? Are you suggesting she should date the fish?

Pictures tell a story. They're not just about the objects in the picture.

Your dating profile pic should not be a caricature. It should tell the story of who you are.

Fishing pics, just one, are appropriate in the album section. They should not be the profile pic.

How many women fishers do you see with a fishing profile pic?

Exactly.

They're not advertising the fish.