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Fundulus olivaceus : ウィキペディア英語版
Fundulus olivaceus

''Fundulus olivaceus'' is a species of fish in the family Fundulidae, the topminnows and North American killifishes. It is known by the common name blackspotted topminnow.〔Froese, R. and D. Pauly, Eds. (''Fundulus olivaceus''. ) FishBase. 2011.〕 It is native to the south-central United States, where it is known from the drainages of the Mississippi River from Illinois to the Gulf of Mexico and as far west as Galveston Bay.〔
This fish has an elongate body up to 9.7 centimeters long. It is brownish yellow to olive green on its upper side and has a wide, dark lateral band and distinct dark spots. The male has longer fins than the female and the fins of the male may take on a yellowish color during breeding. This species is very similar to the blackstripe topminnow (''Fundulus notatus''), which also has a dark lateral band. It can be distinguished from ''F. notatus'' by its darker, more numerous spots. The two may hybridize.〔Hendrickson, D. A. and A. E. Cohen. (''Fundulus olivaceus''. ) Fishes of Texas Project and Online Database (www.fishesoftexas.org). Published by Texas Natural History Collection, a division of Texas Natural Science Center, University of Texas at Austin. 2012.〕
This species lives in clear streams with fast currents and sand or gravel substrates. It can often be found near the thick vegetation along the banks of the streams. It is omnivorous, consuming some plant matter along with a main diet of insects and other arthropods.〔
The fish spawns between March and September, its spawning season peaking around May. Males are aggressive toward other males and actively court females. The male and female come together to spawn in the gravel bottoms of the streams. The eggs are about 2 millimeters wide and are attached with filaments, forming a tuft. They hatch within two weeks. The life span of the fish is probably about 3 years.〔
==References==



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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