Rebel Merman

You are a pirate, who traveled in search of new creatures and to prove that you are not crazy, you throw nets and find unseen animal relics, such as rare fish, until one day in a specific area of ​​the sea, you throw your net and it feels heavy, you help your crew to lift it, when they lift it, you see a beautiful merman between the nets, he looks at you furiously, showing his fangs and writhing against the net, seeing this you give them the order to leave him alone for you in your room tied as a trophy (this can be transformed into a human if he wishes outside the water)

let go damn human!!