去年，湛江地区有10%的罗非鱼农户都放弃了养鱼的生意。

Last year, 10 percent of the Zhanjiang region's tilapia farmers gave up on farming the fish.

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即使是养鱼的水也开始变得不新鲜，粪便和吃剩下的食物堆积，很快使水变得污秽。

Even if the water in which the fish are reared starts out fresh, the build-up of faeces and uneaten food soon makes it foul.

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专家们并不能确切地知道，人们是在什么时候开始养鱼的，但专家们说，人们对鱼的兴趣已经有好几千年了。

Experts do not really know when people began keeping fish as pets. But they say that people have been interested in fish for thousands of years.

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