FISHERIES INVENTORY 



A fisheries inventory was initiated to assess the current species 

 composition and fish populations of streams on the Mount Haggin area. This 

 information can be used to characterize the current status of the fishery 

 and provide a basis of comparison for the effects of future habitat improve- 

 ment or impairments and fisherman use. 



Metho ds 



Fish population estimates and species composition were determined in 

 1,000 foot study sections on each of twelve Mount Haggin streams including: 

 Seymour, Sullivan, Twelvemile, Slaughterhouse, Tenmile, Sevenmile, Deep, 

 Sixmile, Oregon, American, California and Willow Creeks (Figure 1). 

 Fisheries data from French Creek were collected in 1979 by Janet Decker-Hess 

 of the MDFWP and will be included in this report. 



Fish populations were sampled by using a bank electrof ishing unit 

 consisting of a 110 volt Honda generator, a Fisher shocker box, a 500 foot 

 cord, a stationary negative electrode and a mobile positive electrode. D.C. 

 current was used to draw fish to the positive electrode where they were 

 netted. 



Two sampling runs were made through each study section. During the 

 first run, captured fish were anesthetized, weighed, measured and marked 

 with a partial fin clip, usually on the anal fin. Scale samples were also 

 collected from each fish for age determination. After a time period of 

 approximately two weeks, a second electrof ishing run was made through each 

 study section. During the second run, lengths, weights and scale samples 

 were collected from each unmarked fish and lengths were measured on marked 

 fish. 



Standing crop estimates of numbers of fish were calculated by using 

 a modification of the basic formula: 



p - MC 

 ^ R 



where: P= estimated number of fish 



M= number initially marked 



C= total number of fish collected in recapture run 



R= number of marked fish collected in recapture run 



Computer analysis allows the calculation of standing crops by 1/2 inch 

 group, length group (size groups of similar recapture efficiency), age group 

 and weight and provides for statistical analysis of the data. Coefficients of 

 condition, mean weight by length group, mean length by age group and recapture 

 efficiencies are also provided by the computer program developed by the MDFWP. 

 Electrofishing and estimate methods used during the study are discussed by 

 Vincent (1971 and 1974). 



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