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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 ]
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]
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 Neosho madtom (Noturus placidus) is a small North American freshwater catfish. It has been listed as a near-threatened species in the United States since 1996 by the International Union for Conservation of Nature [ 1 ] and as a federally threatened species under the Endangered Species Act of 1973 since June 1990.
The northern madtom shares its habitat with several similar species ranging from the very similar mountain madtom to some invasive species, which create competition for both food and resources. However, not much is known about the specifics of the effect of this competition on the northern madtoms because they are found in such small numbers.
The least madtom's spawning season lasts from June through August. During this time the males increase in size. The females spawn during their second summer. To prepare for spawning, adults take shelter, either singly or in pairs, under stones, shells, or in debris. An average of 19 orange oocytes are laid in these areas. Both parents guard the ...
Brindled madtoms are approximately 10.1 to 12.6 centimeters (4.0 to 5.0 in) long. The brindled madtom, like other Noturus species, has a caudally-fused adipose fin which extends from the caudal fin and runs nearly to the dorsal fin. The caudal fin spreads around the caudal peduncle, terminating just prior to the anal fin.
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