2 sentences

1. 这家农场主要养殖淡水鱼。

   zhè jiā nóng​chǎng zhǔ​yào yǎng​zhí dàn​shuǐ yú.

   This farm mainly breeds freshwater fish.

   Source: Dong Chinese Dictionary

2. 这一带的养殖业以淡水鱼为主。

   zhè yī​dài de yǎng​zhí​yè yǐ dàn​shuǐ yú wéi​zhǔ.

   The aquaculture industry in this area is dominated by freshwater fish.

   Source: Dong Chinese Dictionary