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Mountain brook lamprey
The mountain brook lamprey or Allegheny brook lamprey (''Ichthyomyzon greeleyi'') is a lamprey found in parts of the Mississippi river basin, New York, Pennsylvania, Ohio, and in the Cumberland River and Tennessee River. This fish is jawless with a small sucker mouth and a long, eel-like body. It is fairly small, only growing to about in length.
The mountain brook lamprey is a non-parasitic lamprey, meaning that they do not attach themselves to larger species of fish. The mountain brook lamprey is believed to have evolved from the parasitic Ohio lamprey (''I. bdellium'') and occurs, often in abundance, within many of the tributaries of the Ohio and Tennessee River systems.〔Vladykov, V.D. & I. Kott. 1979. List of northern hemisphere lampreys (Petromyzonidae) and their distribution. Misc. Spec. Publ. 42, Dept. Fish. Oceans, Ottawa.〕 All non-parasitic lampreys require two distinctly different habitats that are connected by free flowing (free of dams) stretches of streams. Adults are found in clear brooks with fast flowing water and either sand or gravel bottoms. Juveniles or ammocoetes are found in slow moving water buried in soft substrate of medium to large streams.〔http://www.dnr.state.oh.us/Default.aspx?tabid=22726〕 As previously stated, the Mountain Brook lamprey is non parasitic and does not attach itself to other fish. In the larval stage before metamorphosis, the lampreys feed on detritus and algae, and after they complete metamorphosis, they obtain energy from stored fat reserves. The spawning season for lampreys is from late April to early May.〔http://www.dec.ny.gov/animals/26031.html〕
==Geographic distribution==
The mountain brook lamprey has a fragmented range in the Mississippi basin with populations being found in New York, Pennsylvania and adjacent areas of Ohio. Mountain brook lamprey are also found in the Cumberland and Tennessee Rivers in Tennessee, northern Alabama, Kentucky, and Virginia. In New York State, this lives in French Creek, and other northern and central parts of the Allegheny basin. The mountain brook lamprey is found in gravel riffles and sandy runs of clean, clear streams and in the sand, mud and debris in pools and backwaters. It spends its life in creeks without moving to larger rivers.〔
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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