Title: California fish and game
Identifier: californiafishga74_4cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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HOOKING MORTALITY OF LAHONTAN CUTTHROAT TROUT 223 Klein (1965) observed no difference in mortality of rainbow trout (Salmo gairdneri) hooked with treble and single hooks at Parvin Lake at 6.5° C, but at 14.5° C, lures with single hooks cause about double the nnortality of treble hooks. Warner (1978) reported no significant difference in mortality of Atlantic salmon caught on lures with single or treble hooks. Falk et al. (1970), Hunsaker et al. (1970), and Bjornn also concluded that barbless hooks did not reduce hooking mortality.
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8 10 12 14 16 18 WATER TEMPERATURE CO 10 FIGURE 2. Relationship between hooking mortality of cutthroat and rainbow trouts and water temperature. CT = cutthroat trout, RT = rainbow trout, TROUT = theoretical cut- throat trout at 24° C. Data taken from Benson and Bulkley (1963), Klein (1965), Hunsaker et. al. (1970), Marnell and Hunsaker (1970), Dotson (1982), and this study. Size of Fish Because post-spawning stress can cause high mortality of adult cutthroat trout (Ball and Cope 1961), we expected higher mortality for larger adult fish than for smaller subadults at Heenan Lake. Heenan Lake cutthroat reach sexual maturity at approximately 350 mm PL (Eric Gerstung, California Department of Fish and Game, pers. commun.). However, mortality for small fish (66%) was higher than for intermediate (53%) or large fish (41%) (Table 3); these differences were not significant (X^ = 2.55, 2 df, p> .05). Klein (1966) and Warner (1978) also showed no significant differences in hooking mortality between different sizes and ages of salmonids. Marnell and Hunsaker (1970) found no mortality difference between hooked spawning and non-spawning cutthroat trout.

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