Qurbaani & Halaal Slaughter

Fishing

Q: I have some doubts regarding fishing, which I would like you to please clear.

1. Is permissible or haraam to fish without the intention of eating/selling/giving away the fish, that is the fisherman practise catch and release.

2. If the above is not permissible, would it be permissible for me to only take home the smaller fish, as I live alone and have no use for the larger fish.

3. If (1) and (2) are not permissible, what may I do with my fishing equipment. May it be sold or given away?