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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 ]
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 slender madtom and the orangethroat darter (Etheostoma spectabile) also compete for and share the same diet. [8] The slender madtom inhabits the rocky riffles and pools of creeks and small rivers, spending much of the day hiding under large rocks and emerging to feed at night. [5] Slender madtoms feed preferably after dusk and before dawn.
The tadpole madtom is an invertivore, planktivore, but also feeds on particulate. A Common food source for the tadpole madtom are immature insects and small crustaceans such as cladocera, ostracods, hyalella, and chironomids. Another popular food source is small crustaceans such as amphipods and isopods. Smaller fish feed more on small ...
The mountain madtom (Noturus eleutherus) is a North American species of temperate freshwater fish belonging to the Noturus genus of the family Ictaluridae. The species was first described to the United States National Museum by Professors Jordan and Gilbert in the Big Pigeon River. [ 2 ]
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.
The pygmy madtom is the smallest of madtoms, reaching only about 50 mm in length at adulthood. It is dark brown dorsally and nearly white ventrally, and is similar to the least madtom, but is distinguished by its white snout and large teeth on the front edge of the pectoral spine. The caudal fin has a dark band or dusky blotches in the middle.
The diet of the northern madtom consists of small insects and invertebrates. However, because the species is found in such small numbers, no real evidence supports the specifics of their diet. Little is known as to the quality or quantity of what the northern madtom eats. The northern madtom is found in different habitats throughout its range.