Fishy leaves the skeld, The pressure of dying to a imposter or even phobia collapsed on him. He just wants to live to see his son prosper and smile. He feels bad about leaving lemon, Red and wall-e but it needed to be done. He will peacefully go back into the ocean with his son and maybe make a few new friends.

TLDR and Real reason: im not going to draw fishy as a among us character due to among us being cringe to me with the cringy ads and annoying memes