1. 牡蛎   herring   kipper   cockle   oyster   Hint Half-n-half Clue   2. 大虾   mussel   prawn   squid   kipper   Half-n-half Clue   3. 扇贝   scallop   herring   cockle   crayfish   Half-n-half Clue   4. 鲥鱼   crayfish   scallop   turbot   anchovy   Half-n-half Clue   5. 鸟蛤   winkle   cockle   hake   mullet   Half-n-half Clue   6. 鲱鱼   herring   mullet   scallop   mussel   Half-n-half Clue   7. 单一   anchovy   whiting   scallop   sole   Half-n-half Clue