1990 Grayling Spawning Report 



spring of 1989 and, hopefully, this year class will remain strong 

 and grow to maturity. It is probable that the Big Hole River 

 grayling population will be dependent upon this 1988 year class. 



Of 38 grayling recaptured during spring 1989 sampling, fifteen 

 were tagged during the same sampling, seventeen were tagged in 

 1988, one was tagged in 1987, and five tagging locations could not 

 be determined. Tagging data illustrated that movements between the 

 lower river near Fishtrap Creek and upper river near Wisdom, and 

 between the main stem river and its tributaries were occurring. 

 This tag return information lends additional support to our 

 observations that at least a segment of the Big Hole River grayling 

 population uses the entire river above Divide on a seasonal basis. 

 We believe a portion of the grayling population normally moves to 

 the upper river (near Wisdom) during the spring, remains in this 

 area of the river during the summer, before emigrating down river 

 to winter habitats. Use of the lower portions of at least some 

 tributaries by Big Hole River grayling was further supported. 



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