Possible Clues:

• Tiny crustacean with a shrimp-like body enclosed in a bivalve shell
• Crustacean, a sort to swim alongside fish
• Tiny crustacean to serve and possibly float this way up
• Tiny crustacean and enormous fish caught in net mostly? The opposite
• Tiny crustacean and huge fish clinging to outside of capsized craft
• Minute crustacean with a bivalve shell