1. 鳕鱼   shellfish   salmon   cod   tuna   Hint Half-n-half Clue   2. 蛤蜊   clam   crab   cod   lobster   Half-n-half Clue   3. 螃蟹   trout   crab   lobster   shark   Half-n-half Clue   4. 鱼   sardine   shellfish   fish   crab   Half-n-half Clue   5. 沙丁鱼   shark   sardine   shrimp   tuna   Half-n-half Clue   6. 金枪鱼   trout   salmon   shrimp   tuna   Half-n-half Clue   7. 鳟鱼   clam   crab   tuna   trout   Half-n-half Clue