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Northern madtom
The northern madtom (''Noturus stigmosus'') is a freshwater fish. It is one of the 324 fish species found in Tennessee.
==Introduction==
This report looks at the life history and characteristics of ''Noturus stigmosus'', the northern madtom, in order to provide a plan for the monitoring of the species. ''Noturus stigmosus'' can be found in the Ohio River valley stretching into distinct locations in Canada where it is considered endangered. It is a fairly rare species with little data available because there are such small numbers observed.〔Holm E., N.E. Mandrak. 2001. Updated status of the northern madtom, ''Noturus stigmosus'', in Canada. Canadian Field Naturalist 115:138-144〕 The northern madtom prefers habitats with relatively swift currents along with sand, silt, or rocky substrates. The species begins spawning at around 23 degrees Celsius, which is sometime in early summer throughout its range. It is a cavity nester and builds its nests under large rocks and logs.〔Parsons Glenn R. 1994. Notes on the status and life history of the northern madtom, ''Noturus stigmosus'', in Mississippi. Southeastern Fishes Council Proceedings 30:1-3〕 Presently, not much is known about the ecology or life history of this species because it is found in such small numbers throughout its range.
It is recorded that the species can survive in waters with some turbidity but not in waters with a high amount of sediment pollution. One of the leading management actions aiding in the successful reproduction of this species is keeping the waters void of sediment pollution and habitat alterations.〔DFO. 2012. Recovery potential assessment of Northern Madtom (''Noturus stigmosus'') in Canada. DFO Can. Sci. Advis. Sec. Sci. Advis. Rep. 2012/051〕 Both of which could be detrimental to ''Noturus stigmosus''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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