Inventory And Survey of Selected Stream Fisheries of the Red Rock, Ruby And Beaverhead River Drainages of Southwest Montana [electronic Resource (Cd-Rom)]: 2003-2006 2006
Inventory And Survey of Selected Stream Fisheries of the Red Rock, Ruby And Beaverhead River Drainages of Southwest Montana [electronic Resource (Cd-Rom)]: 2003-2006 2006
Montana.Dept. of Fish, Wildlife, And Parks
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The 1999 population estimate of 292 grayling per mile represented in a decline in the number of fish planted in 1999 and was 16 dominated by yearling fish. Standing crop in both years approximated 100 pounds per mile indicative of larger sized yearling plants in 1999 and the presence of Age II fish in the population. Subsequent samples through 2002 showed a marked decrease in grayling survival with decreasing flow regime, diminished planting efforts and high overwinter mortality. Wild reproduct...ion of grayling was documented (Oswald 2003) but observed recruitment was limited due to low survival of stocked fish to reproductive adulthood. Resumption of yearling plants in 2003 again resulted in an immediate population increase that, again, diminished over the 2003 - 2005 period. While the 2005 population density was relatively low compared with past introduction samples, the population was marked by two age classes (0 and I) of wild juvenile recruits as well as some older fish from past spawning efforts of planted fish.
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