. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 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 ° C, but at ° 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), Hunsa
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 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 ° C, but at ° 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 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 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloratio
Size: 1878px × 1331px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcaliforniadeptoffishandgame, bookauthorcaliforniafish
