There is no way in hell he is getting rid of all that. No amount of exercise in the ocean can help with that. Nor the medication, since even that has it's limits and has side effects with shark chum of all things.
Honestly there should be a scene where he becomes hedonistic for food after you fill him up like this and you and the Bat have to keep him from completely bankrupting the Bat. We love you Himbo Shark, but you better watch your waistline.
It is the story paths that appear in my mind like that which gives this game's characters rent free space in my mind. Yeah, I can't wait for January to come any time soon.