Possible Clues:

• Boss of trawler, say, heading off for fish
• Has smoking put one to sleep?
• Captains will have this fish aboard ship
• One not yet out of bed for his breakfast?
• Captain's given fish but not head
• Possible breakfast for one in bed?
• He sleeps with the fish
• Captains shelled seafood
• Fish — one snoozing?
• One dozing having been given a smoke?