Possible Clues:

• Just a leg, Sir, of not a very big fish
• Salmon on first return to fresh water
• Just a little leg of salmon, sir
• A one-year old salmon
• A little salmon? Just a leg, Sir?
• Puts the question verbally: fish?
• Young salmon returning to fresh water for the first time
• Gel, sir? (anag) — young salmon
• Cook left out two thirds of sea salmon
• Fish from Algiers decapitated, then cooked