Possible Clues:

• Latin American delicacy
• Tripe abruptly served with a shellfish
• Sailor, with no one else present, produces seafood
• A good deal of sausage and shellfish
• Sailor, with no one else present, produces an ear shell
• Sushi-bar selection
• Pearl source
• Sailor away from other crew members finds gastropod
• Sailor only gets shellfish
• The sort of seafood that the seaman got all by himself