Oh, and jobs for the other able bodied sea-fish:
Snails, Plecos: They are deck hands, in charge of swabbing the deck
Mollies, Platies: They are in charge of raising the sails (if it is a sailing ship) or maybe they are engineers (if this is a powered ship).
White Cloud Minnow: Cabin boy. (or girl)
Now on to back story!!!!!!
Definitely a sailing ship..
Their goal.. The Chest of Eden..