Possible Clues:

• Tiny creatures of the deep, a hundred on board
• Stupid person, not returning for seafood?
• Work out Kathleen is not going back for a fishy dinner?
• Seafood? Bucketload put on board
• Board to name organisms drifting at sea
• Fish food: idiot has loads
• Tiny plant or animal organisms that drift in water
• Ocean drifters not put back on board
• Marine organisms
• Board not coming up for food