Date of Award

Spring 1977

Document Type



Life & Environmental Sciences

First Advisor

James Manion

Second Advisor

Alfred Murray

Third Advisor

Guido Bugni


Using six surface gill nets, on October 17, 1975, a sample of Kokanee (On corhyn ohus nerka) were taken from the Helena Valley Reservoir, near Helena, Montana. The age and growth characteristics of these fish were studied by the use of otoliths and scales. A comparison with the sampled populations of 1969, 1974 and 1976 was made. An investigation of oxygen content, temperature, turbidity, and conductivity was made to see how much of the lake is suitable Kokanec habitat. Carp (Oyorlnus carpio) were also captured, for the first time, during this gill netting procedure.