The generating period of the fathead minnow flies June with July, with some spawning as very early as mid-May, and encompassing very early August. They choose a temperature level range of 50 - 70 degrees Fahrenheit, and also spawing occurs in temperatures around 64 degrees Fahrenheit. The male looks after eggs that the women down payments in a nest. Generally, a male fathead minnow will certainly take control of a nest site that is currently in usage. It chooses sites that currently include eggs, and the even more eggs in the nest, the more probable the present male will be challenged by a brand-new male fathead minnow. This type of behavior is called allopathernal treatment, where one man displaces the various other male. Men aerate the eggs, they eliminate diseased eggs, and also they shield eggs from killers such as crayfish. By "changing out" the males, it enables greater survival of the eggs, as the brand-new males that take over are "fresher" and a lot more fit possibly, to continue on the job of securing the eggs. Each male minnow defends the site for 3 to five weeks, permitting a "changing of the guard". The eggs hatch out in about 5 days.
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The fathead minnow has an alarm that launches a material called Schreckstoff when specific cells are wounded in an attack. After that, this released element is discovered by the killer fish who then will hide or dart away. This system assists fathead minnows recognize possible killers. The fathead's key predator is the north pike, as well as this chemical recognition ability aids the minnow recognize its predators.