adults = variable, but generally prefers still waters over flowing waters spawning = underside of an object in shallow water; Fathead Minnow exhibits lacustrine and riverine life history types. In southern areas, spawning occurs from April to mid-August. The male constructs a nest under rocks, logs, branches, boards, or occasionally lily pads in 0.61─0.91 m of water. The female deposits adhesive eggs on the undersurface of the nest. The male fertilizes the eggs and defends the nest. Incubation generally lasts from 4.5─6 days and is dependent on water temperature. The young are often found in shallow water over sand and mud substrates in protected areas such as marshes, harbours, and creek mouths. Adults are typically more active at night, while juveniles are more active during the day (Richardson et al. 2001; Evans et al. 2002). Fathead Minnows are tolerant of high water temperatures, low dissolved oxygen, and turbidity (Evans et al. 2002).