鳉鱼，英文名killifish，是银汉鱼目（Afherinoformes）齿鲤科（Aplocheilidae）中的鱼类。原产地大多在南、北美洲和非洲的热带、亚热带沼泽和溪流中，是小型观赏鱼类。鳉鱼种类繁多，广义上包括卵生鳉鱼和卵胎生鳉鱼。适宜水温环境在18-26℃，一般不应超过30℃。概述图引自中国动物志数据库。
当他到达市场时，他发现鳉鱼看起来像小金鱼，而且它们便宜得多。
When he got to the market, he found that the killifish looked like small goldfish, and they were much cheaper.
哈德逊鳕鱼和新贝尔福德鳉鱼都拥有特殊的AHR。
Both Hudson tomcod and New Bedford killifish, however, have unusual AHR molecules.
斯蒂门记录有另一种对有毒的多氯联苯和多环芳烃有抵抗作用海岸物种，那是一种鳉鱼。
Stegeman has been chronicling resistance to toxic PCBs and polycyclic aromatic hydrocarbons in another coastal species, a killifish.
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