Is Betta fish fight illegal in Poland

I wonder if it comes under animal cruelty law in Poland?

Polish legislation prohibits animal fights.

Im debating and googling if fish are animals.

If not animals, then what? Plants? Fungi?

Some people consider fish meat something different than usual meat, for example it's perfectly "legal" (from religious point of view) to eat fish during fast, hence carp (or other fish) on Christmas Eve dinner in Poland, but it doesn't mean that fish is not animal.

Do fishes f**k? If yes, they are animals.

I Never saw a Tree or a Mushroom f**king.