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Madtoms are freshwater catfishes (order Siluriformes) of the genus Noturus of the family Ictaluridae. It is the most species-rich genus of catfish in North America, [ 1 ] native to the central and eastern United States, and adjacent parts of Canada. [ 2 ]
Due to the tadpole madtom's secretive nature, little is known of their spawning habits. In most areas the tadpole madtom spawn in June or July when the water temperature reaches 80 °F. [8] Breeding males exhibit swelling of the lips and genital papillae as well as enlarged muscles on top of the head. Breeding tadpole madtoms do not build nests ...
Little is known about the Ouachita madtom's reproduction. However, on August 1, 1980 six Ouachita madtoms were collected in a stream only 3.9 feet (1.2 m) across. The six specimens were obviously young-of-the-year, and their presence raised speculations that Ouachita madtoms seek smaller streams during summer months to spawn.
The margined madtom is yellow to dark gray on the upper side of the body, and a pale shade on the underside. It is slimmer than other members of the family Ictaluridae. It has a square tail and lacks the rays of other tadpole madtoms. The dorsal fin and anal fins are rounded, the chin barbels are pale, and all the other barbels are dark.
The Ictaluridae, sometimes called ictalurids, are a family of catfish native to North America, where they are an important food source and sometimes fished for sport.The family includes about 51 species, some commonly known as bullheads, madtoms, channel catfish, and blue catfish.
Checkered madtoms are ready to spawn by April, but may not spawn until July. Males of three to five years guard the nests. Females most likely leave the nests while males remain to care for the embryos. [6] Checkered madtom embryos resemble the embryos of other madtoms. Larvae 10 to 12 days old begin to have proportions resembling adults. [6]
The freckled madtom is known to inhabit fast-moving and permanently moving streams that are medium to large in size. The streams usually contain rocky bottoms. Further, this species is sometimes found in the vicinity of undercut banks near masses of sticks and roots. [2] The freckled madtom is primarily an invertivore (feeding
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