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River carpsucker
The river carpsucker (''Carpiodes carpio'') is a freshwater fish found in the eastern United States. This species has a slightly arched back and is somewhat stout and compressed. While the fins are usually opaque, in older fish they may be dark yellow. It is distributed along the Mississippi River basin from Pennsylvania to Montana. The river carpsucker, like other suckers, is a bottom feeder and obtains its nutrients from algae, microcrustaceans, and other various tiny planktonic plants and animals found in silty substrates. The river carpsucker typically lives about two to four years, but may survive for up to 10 years. It begins to reproduce typically in late spring, and the female usually releases more than 100,000 eggs; it reaches sexual maturity around two or three years old. After releasing and fertilizing their eggs, all parental care is ended.
==Appearance and anatomy==
The physical appearance of the river carpsucker is fairly distinctive. It is stout, with a somewhat compressed and arched back. The area around its dorsal fin is olive-brown before it fades to silver, with a white belly. In the young, the fins are usually opaque, while in the old, their fins are a dark yellow.〔BioKIDS. ("Carpiodes Carpio" ). 2011.〕 The lower lip is projected in a similar fashion to a nipple at the midpoint, and big scales cover its whole body. It also has a distinctive 18 caudal fin rays.〔Morris, JE., Quist, MC., and Spiegel, JR. 2010. Precision of Scales and Pectoral Fin Rays for Estimating Age of Highfin Carpsucker, Quillback Carpsucker, and River Carpsucker. Journal of Freshwater Ecology 25:271-278〕 The species is frequently confused with non-native species, such as the various Asian carp species.
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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