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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 ]
The Ozark madtom can by found in riffles and rocky pools, as well as cool, clear, high-gradient creeks and small to medium-sized rivers. They are found in shallow depths (usually of less than half a meter deep) and high velocity currents. [1] During the day, they use the rocky bed bottom as cover. [4]
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.
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 frecklebelly madtom is a robust, boldly patterned member of the monophyletic saddled madtom subgenus Rabida. [4] Historically, the population thrived in large rivers in the Mobile Basin and Pearl River drainages in the southeastern United States. [5] However, it is currently limited to the Coastal Plain rivers. [6]
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]
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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.