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Any of several small freshwater North American catfishes of the genus Noturus, having poison glands at the base of the pectoral and dorsal fin spines.

[mad + tom(cat) (probably so called because the fish swim in an excited zigzag manner when agitated).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) any of various North American catfish
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



any of several small North American freshwater catfishes of the genus Noturus, having a poisonous pectoral spine.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The redbreast sunfish [right] and other species such as spotted sunfish and tadpole madtom have been shown to decline from flathead and blue catfish introductions in North Carolina.
Effects of rearing density on the growth of larval madtom catfish, Noturus flavipinnis, raised in captivity.
Food habits of the Brindled Madtom. Noturns miurus Jordan, and the Redfin Shiner, Notropis umbratilis Girard, from west central Indiana.
(2007) reported increased susceptibility of bluegill, Lepomis macrochirus, to predation at power densities of ~1,050 [micro]W/[cm.sup.3], and Miranda and Kidwell (2010) induced injury (mortality, spinal injury, and tissue hemorrhage) to four nongame species (creek chub, Semotilus atromaculatus; bluntnose minnow, Pimephales notatus; tadpole madtom, Noturus gyrinus; and redfin darter, Etheostoma whipplei) at higher power densities between 1.0 x [10.sup.5] and 6.8 x [10.sup.7] [mu]W/[cm.sup.3].
Ralph Taylor, Assistant Curator at the National Museum of Natural History, examined faded brindled madtom specimens collected by Jordan and other biologists in the upper Tennessee drainage and discover a new species--the yellowfin madtom (Noturus flavipinnis).
Besides largemouth and smallmouth bass, the more-is-better thinkers of the past also introduced bluegills, bowfin, rainbow trout, coho salmon, sockeye salmon, brown trout, central mud minnow, northern pike, goldfish, red mimic shiner, blunt-nose minnow, flathead minnow, white catfish, yellow bullhead, channel catfish, tadpole madtom, margined madtom, rockbass, green sunfish, white crappie and walleye.
2002 Intraspecific phylogeography of the slender madtom: The complex evolutionary history of the Central Highlands of United States.
Number of 5 5 5 5 3 5 3 5 darter + madtom species 5.
(45) See generally Dinnell & Russ, supra note 11, at 584 (for example, "Lake Erie [alone] is home to various endangered and threatened species, including the Lake Erie water snake, American burying beetle, bald eagle, copperbelly water snake, Indiana bat, lakeside daisy, Scioto madtom, purple cat's paw pearly mussel, running buffalo clover, and the migratory piping plover").
Most importantly, the brown madtom, Notorus phaeus is reported from Arkansas for only the second time since its original discovery in Columbia County in 1972.
The Naked sand darter, Scaly sand darter, Firebelly darter, Blue sucker, Bigmouth sucker, Plains minnow, and Northern madtom are among the rare nongame fish in the Region.
Some companion species that share the hellbender stream are other non-game aquatic indicator species such as log perch, darters, freshwater mussels, aquatic insect larva, freshwater sponge, crayfish, madtom catfish, mudpuppies, frogs, toads and turtles.