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salmon louse
The salmon louse, ''Lepeophtheirus salmonis'', is a species of copepod in the genus ''Lepeophtheirus''.
It is a sea louse, a parasite living on salmon. They are also known as "sea lice". It lives off the mucus, skin and blood of the fish. They are natural marine parasites of fish, such as adult salmon.〔 "Sea Lice." Marine Institute. Marine Institute, n. d. Web. 10 Dec. 2013. .〕 They are similar to plankton and ride on the waves.〔"Sea Lice." Marine Institute. Marine Institute, n. d. Web. 10 Dec. 2013. .〕 When they encounter a marine fish they adhere themselves to the skin, fins, the gills of the fish, and feeding off the mucous or skin.〔"Sea Lice." Marine Institute. Marine Institute, n. d. Web. 10 Dec. 2013. .〕 Sea lice only affects fish and is not harmful towards humans.〔"Sea Lice." Marine Institute. Marine Institute, n. d. Web. 10 Dec. 2013. .〕
==Life Cycle==
There has been some research on the problems caused by this species in aquaculture, but little is known about the salmon louse's life in nature. It has been shown, however, that salmon louse infections in fish farming facilities can cause epizootics in wild fish.
The life cycle consists of 8 stages, with ecdysis in between. The first two stages are free swimming nauplius I and II, where it has a length between 0.54 and 0.85 mm. The third stage is the copepodit stage, in which the length is ca. 0.7 mm, and the salmon louse attaches itself to the fish. Stages IV and V are the chalimus stages. The salmon louse eats from the fish, and grows to a length of 5 mm for the males, 10 mm for the females. Each generation takes about six weeks at a temperature of . In the pre-adult and adult stages (stage VI to IIX), the sea louse is now mobile, and it becomes possible to differentiate males and females.
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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