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The back is olive-brown with 8 - 9 dark cross bars on sides. It has a orange belly, bluish-brown cheeks and irridescent golden-green gill cover. The dorsal fin is edged with blue with a row of reddish spots; the sides have about a dozen bluish blotches and the fins are light orange.
Common in the upper Mississippi River basin; found in creeks and upper reaches of rivers in northeast Iowa in moderate abundance.
aquatic insect larvae, small snails and tiny crayfish
2 1/2 inches
The Rainbow Darter is common in the upper Mississippi River basin. They are found in creeks and upper reaches of rivers in northeast Iowa in moderate abundance.
The Rainbow Darter is a fairly large and stout-bodied species about 2 1/2 inches in length. It is brownish-olive with 8 or 9 greenish-brown bars on the sides, orange belly, bluish-brown cheeks, and irridescent golden green opercle. The spinous dorsal fin is edged with blue and has a row of reddish spots, sides with about a dozen bluish blotches, and light orange fins. There are 12 dorsal fin rays, 7 anal rays, and 45 or more scales along the lateral line . This species is the most brilliantly colored of all darters.
Rainbow Darters live in creeks and small rivers of moderate gradient and riffles made of coarse gravel and rubble. Under ideal habitat conditions of this type they may be locally the most abundant darter.
They eat a variety of aquatic insect larvae and sometimes small snails and tiny crayfish.
Spawning takes place as the water temperature reaches 62 degrees F. Males have shifting, poorly defined territories and they attempt to intimidate intruding males. Females enter from pools downstream and lay eggs in gravel at the foot of riffles. The spawning act, with the male mounted on the back of the female, is repeated several times as she moves upstream. Several days may be needed for a female to deposit as many as 800 eggs.