1. Pinyin of 鳉: jiāng. Definition: Fish, with flat sides, about three to four centimeters long, flat head, protruding abdomen, small mouth, silvery gray. Lives in fresh water and likes to eat larvae.

2. Killifish, whose English name is killifish, is a fish in the Aplocheilidae family (Aplocheilidae) of the order Afherinoformes. Most of its origins are in tropical and subtropical swamps and streams in South and North America and Africa. It is a small ornamental fish. There are many species of killifish, broadly including oviparous killifish and ovoviviparous killifish. The suitable water temperature environment is 18-26℃, and generally should not exceed 30℃.