The Collaborative International Dictionary
brook fish
Killifish \Kil"li*fish`\, n. (Zo["o]l.) Any one of several small American cyprinodont fishes of the genus Fundulus and allied genera. They live equally well in fresh and brackish water, or even in the sea. They are usually striped or barred with black. Called also minnow, and brook fish. See Minnow.
Usage examples of "brook fish".
As a chieftain of the semi-departed Communist Party, he would have lived under greater personal restrictions than were now the case, and would always be at the end of a telephone line to Moscow, like a brook fish at the end of a long leader.