1. The bitterling is a small freshwater fish native to East Asia.

苦鱼是一种生活在东亚的小型淡水鱼。

2. The male bitterling has bright colors to attract the female during mating season.

雄性苦鱼在交配季节会展示出鲜艳的颜色来吸引雌性。

3. Bitterlings are known for their unique breeding behavior of depositing their eggs inside freshwater mussels.

苦鱼以将卵产在淡水贝类内部的独特繁殖行为而闻名。

4. Some people keep bitterlings in their aquariums because of their interesting behavior and appearance.

一些人会在他们的水族箱里饲养苦鱼，因为它们的有趣行为和外观。

5. The bitterling is a popular subject for study among biologists due to its symbiotic relationship with freshwater mussels.

苦鱼因与淡水贝类的共生关系而成为生物学家研究的热门课题。

6. Bitterlings are often found in clear, slow-moving streams and ponds in their natural habitat.

苦鱼通常生活在清澈、缓流的溪流和池塘中。