fish productivity of reservoir

例句：

1. 1. The fisherman caught a big catch this morning.
   渔民今天早上捕到了一条大鱼。
2. 2. The fish market is always crowded with people buying and selling fish.
   鱼市场总是挤满了买和卖鱼的人。
3. 3. Fish are an important source of protein for many people.
   鱼是许多人蛋白质的重要来源。