The fathead minnow has an alarm that releases a compound called Schreckstoff when specific cells are harmed in a strike. After that, this launched material is identified by the killer fish that after that will certainly hide or dart away. This system helps fathead minnows realized possible killers. The fathead's primary predator is the northern pike, and also this chemical recognition capability aids the minnow recognize its predators.

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Fathead minnows could tolerate, fairly well, extreme disorders. It could populate waters that could be unliveable to various other fish. Waste drain websites are an instance. However, the toxins in these scenarios could have an effect on the minnows. There can be decreased reproductive capability.