The generating season of the fathead minnow ranges from June via July, with some spawning as very early as mid-May, and also prolonging to early August. They like a temperature level range of 50 - 70 degrees Fahrenheit, as well as spawing happens in temperature levels around 64 degrees Fahrenheit. The male looks after eggs that the female deposits in a nest. Generally, a male fathead minnow will take control of a nest site that is currently in operation. It chooses websites that already consist of eggs, and also the more eggs in the nest, the most likely the existing man will be challenged by a brand-new male fathead minnow. This kind of habits is called allopathernal care, where one male displaces the various other male. Men aerate the eggs, they get rid of unhealthy eggs, and also they guard eggs from killers such as crayfish. By "switching over out" the men, it enables higher survival of the eggs, as the brand-new men that take control of are "fresher" and also more fit perhaps, to advance the task of shielding the eggs. Each male minnow safeguards the site for 3 to five weeks, enabling a "transforming of the guard". The eggs hatch in about five days.
Fathead minnows could tolerate, relatively well, rough disorders. It could live in waters that may be unliveable to various other fish. Waste drainage sites are an instance. Nevertheless, the contaminants in these situations could impact the minnows. There can be reduced reproductive capacity.