Salmon , brown trout , char , pollan and eel all occur naturally and other varieties such as pike , roach and rainbow trout have been introduced from outside 鲑鱼、斑鳟、红点鲑、爱尔兰白鲑和鳗鱼都是天然品种，其它品种如梭鱼、石斑鱼、和虹鳟鱼，则是从外海引进的。
2.
And mr pollan notes that only one - fifth of the energy associated with food production across the whole food chain is consumed on the farm : the rest goes on transport and processing 博兰指出食品生产过程所耗能源仅为整个食品供应链能源消耗的1 / 5 ，其余能源均用于食品运输和加工。
