Johnny darter (Etheostoma nigrum) fish species and information / pictures of Johnny darter - Etheostoma nigrum

Johnny darter (Etheostoma nigrum) fish species information

Scientific Name
Etheostoma nigrum

Common Name
Johnny darter

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).

Classification

Classified By
Rafinesque, 1820
Class
Ray-finned fishes (Actinopterygii)
Order
Perch-like fish (Perciformes)
Family
Perches (Percidae)

Distribution

Region
North America
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.
Range
59°N - 32°N

Environment

Climate
Temperate
Water Temperature From
4 °C
Water Temperature To
18 °C
Depth From - meters
Unknown m
Depth To - meters
Unknown m
Zone
benthopelagic
Environment
Freshwater; ; pH range: 7.0 - ? ; dH range: ? - 15 benthopelagic
Trophic Level
3.19 s.e. 0.40 Based on food items.
Occurs in Marine / Salt water
False
Occurs in Brackish water
False
Occurs in Fresh Water
True
Occurs on Reefs
False
Is kept in Aquariums
False

Physical Size and Genetics

Maximum Length
7.2 cm
Common Length
3.9 cm
Phylogenetic Diversity Index
PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses
Unknown
Vulnerability
Low vulnerability (14 of 100)
Resilience
Medium, minimum population doubling time 1.4 - 4.4 years (K=0.95; tmax=4; Fec=47-691)
Threat To Humans
  Harmless
IUCN Red List Status
  Not Evaluated