Possible Clues:

• Drifting microorganisms
• Board with weight of seafood
• Drifters in the sea not about to join piece of wood
• Part of wooden boat has not overturned — they're adrift in the ocean
• Leader of trust blocking deal over marine organisms
• Seafood not sent back on board
• Marine organism
• Food source for aquatic creatures
• Board not set up to provide food for school, possibly
• Food for fish board has not raised