alarm substance A substance released from the skin of injured fish that causes an immediate alarm reaction among fish nearby, leading to the dispersal of a school formed by members of the same species. Originally discovered in minnows and other Cyprinidae, the alarm substance is probably present in several fish families.

alarm substance A substance released from the skin of injured fish that causes an immediate alarm reaction among fish nearby, leading to the dispersal of a school formed by members of the same species. Originally discovered in minnows and other Cyprinidae, the alarm substance is probably present in several fish families.