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| rainbow darter ： ウィキペディア英語版 |
rainbow darter
The rainbow darter (''Etheostoma caeruleum'') is a native North American fish found in small, fast-moving streams and small to medium-sized rivers. It grows to in length. The species is very sensitive to pollution and silt, staying in clean, pollution-free water. The rainbow darter is easily identified by three dark spots on the back, and blue and orange in the dorsal and anal fins. It is a small perch-like fish found in freshwater streams in North America.
==Life==
The rainbow darter spawns in clean, rocky riffles from March through June. It has a lifespan of about 4 years. The males can grow up to 48 mm long, while the largest female reaches just under 43 mm. The male form is resplendent in bright oranges and iridescent blue spots, stripes, and checks.
The record largest rainbow darter, caught in the summer of 2010 just outside of Barrie, Ontario, measured 80 mm in length. It was released.
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