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Monday, January 29 • 2:20pm - 2:40pm
SALMONIDS: Occurrence of Salmincola sp. on Brook Trout Salvelinus fontinalis in Tobin Harbor, Isle Royale National Park

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AUTHORS. Evan Boone, Henry Quinlan - U.S. Fish & Wildlife Service

ABSTRACT. Copepods of the genus Salmincola (family Lernaeopodidae)parasitize fishes from the family Salmonidae and are commonly referred to as gill lice or gill maggots. Large infections in the gills can have detrimental effects on host wellness. Brook trout Salvelinus fontinalis were macroscopically examined for gill lice during electrofishing surveys in Tobin Harbor, Isle Royale National Park from 2005 to 2017.  Annual gill lice prevalence varied significantly over the 12 year study period. Prevalence was negatively correlated with the percentage of substock (Salmincola sp., 79% were less than 20 cm in length. The majority of substock fish were not infected or displayed a light infection in the gills, whereas the majority of preferred plus (> 40cm) size hosts were infected at either moderate or heavy levels. Similarly, condition varied by Brook Trout length. Relative weights of stock and quality size Brook Trout were significantly higher than relative weights of substock and preferred plus size fish. Overall, the accumulation of large lice densities seem to contribute to declining condition scores in the Tobin Harbor Brook Trout population. 

Monday January 29, 2018 2:20pm - 2:40pm CST