广播电视英语短句 第 73 课：池塘养鱼-3

They can eat weeds and small organisms, like plankton and algae. 它们可以吃水草和小生物，比如浮游生物和水藻。

Fish can also be raised in tanks, either indoors or outdoors. 也可以在罐子里面养鱼，室内室外都可以。

Deciding which kind of fish to raise depends on the water quality, salt content and temperature. 养殖哪种鱼是由水的质量，含盐量和温度决定的。

The best idea, experts say, is to raise fish that normally live in the source of water that you use. 专家说，饲养正常生活在你使用的水源里的鱼是最佳的方法。

Also, you should remove wild fish, or else they could eat your fish. 还有，你要去除野生鱼类，否则他们会吃掉你的鱼。