名詞 killifish:

1. small mostly marine warm-water carp-like schooling fishes; used as bait or aquarium fishes or in mosquito control

kil.li.fish

n.（名詞）
【復數(shù)】 killifish 或 kil.li.fish.es
Any of numerous small fishes of the family Cyprinodontidae, including the guppy and mosquito fish, inhabiting chiefly fresh and brackish waters in warm regions.
鳉魚：屬于鳉科的許多種小型魚，包括虹鳉和蚊魚，主要棲居在溫暖地帶的淡水和咸水中

來源：
Perhaps kill 2
可能為 kill2
fish
fish