mosquitofish

例句：

1. 1. The guppy is a small fish that lives in freshwater ponds.
   金鱼是一种生活在淡水池塘中的小型鱼类。
2. 2. The zebrafish is a popular pet because of its bright colors and playful nature.
   斑马鱼因其鲜艳的颜色和活泼的性格而成为受欢迎的宠物。
3. 3. The guppy's ability to adapt to different environments makes it a valuable research subject.
   金鱼适应不同环境的能力使其成为一个宝贵的研究主题。