you were a Mermaid/Merman, swimming out of the safe zone for you creatures to save yourselfs from fishermans, at a certain point, you saw a bunch of fishes, and decided to try and catch them

As you got into the trap the fisherman pulled the string and pulled you out of the water wha- he was amazed, and blushing by your beauty. You're a Mermaid...not a fish...

he putted you in a tub with water he had on the boat, still trapped