Etheostoma nigrum Rafinesque, 1820
Johnny darter
photo by Markwell, B.

Family:  Percidae (Perches), subfamily: Etheostomatinae
Max. size:  7.2 cm TL (male/unsexed); max. reported age: 4 years
Environment:  benthopelagic; freshwater; pH range: 7; dH range: 15
Distribution:  North America: St. Lawrence-Great Lakes, Hudson Bay, and Mississippi River basins from Hudson Bay to southern Mississippi in the USA, and from Quebec in Canada and from Virginia in the USA to Saskatchewan in Canada and Colorado in the USA; and on Atlantic and Gulf Slope drainages in the USA.
Biology:  Occur in sandy and muddy, sometimes rocky, pools of headwaters, creeks, and small to medium rivers; and in sandy shores of lakes (Ref. 5723, 10294); also found in streams (Ref. 10294). Adults feed on midge larvae, mayfly nymphs, caddis larvae, and microcrustaceans; young on entomostracans and tiny midge larvae (Ref. 10294). Eggs are found clustered on underside of stone and guarded by males (Ref. 7043).
IUCN Red List Status: Least Concern (LC); Date assessed: 21 December 2011 Ref. (124695)
Threat to humans:  harmless
Country info:   

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