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Blue Mesa Reservoir is the largest body of water in Colorado and is locatedon the western slope of the Rocky Mountains at an elevation of 7520 feet. BlueMesa Reservoir contains recreationally important populations of lake trout(Salvelinus namaycush), kokanee salmon (Oncorhynchus nerka), rainbow trout(Onocorhynchus mykiss), and brown trout (Salmo trutta). A management challengein recent years has been the overpopulation of lake trout, which has led to asteep decline in abundance of kokanee salmon (a preferred food source) followedby a steep decline in body condition of the lake trout. Relative weight, Wr, iscommonly used to assess body condition and prey availability of fish in avariety of ecosystems, but its seasonal variability has not been welldocumented in cold water species. Relative weight is 100 times the actualweight of a fish divided by expected weight (or standard weight) of thatspecies at the measured total length. The present study uses multi-year,multi-season length and weight data provided by the Colorado Department ofParks and Wildlife to quantify seasonal variations in mean relative weight inthese four species. It is found that lake trout consistently lose significantbody condition between the spring and the fall of a given year, with a meanloss in relative weight of 11.7 +/- 2.4. In contrast, kokanee salmon tend togain significant body condition between spring and fall with a mean gain inrelative weight of 5.2 +/- 2.9. Rainbow trout tend to lose body conditionbetween summer and fall with a mean loss of relative weight of 7.4 +/- 1.7.Brown trout tend to gain body condition between spring and fall with a meangain of 5.6 +/- 1.8. These findings can be interpreted in terms of the feedinghabits, forage availability, and metabolic activity of each species.

Seasonal Variations in Relative Weight of Lake Trout (Salvelinus  namaycush), Kokanee Salmon (Oncorhynchus nerka), Rainbow Trout (Onocorhynchus  mykiss), and Brown Trout (Salmo trutta) in Blue Mesa Reservoir, Colorado