. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. RAINBOW TROUT COSTS 261 TABLE 9—Tag Returns, Mortality and Survival Rates, and Cost/Lb to the Angler's Creel of Tagged Rainbow Trout Planted in Lake Isabella in 1969 Total* returns Number tagged Percent total harvest Annual rates Percent Strain Fishing mortality (u) Survival (s) Natural mortality (v) total returns before Oct. 1 1969 RTSt RTW RTK-C 141 (26) 79 (65) 93 (29) 398 399 397 ---
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. RAINBOW TROUT COSTS 261 TABLE 9—Tag Returns, Mortality and Survival Rates, and Cost/Lb to the Angler's Creel of Tagged Rainbow Trout Planted in Lake Isabella in 1969 Total* returns Number tagged Percent total harvest Annual rates Percent Strain Fishing mortality (u) Survival (s) Natural mortality (v) total returns before Oct. 1 1969 RTSt RTW RTK-C 141 (26) 79 (65) 93 (29) 398 399 397 --- Total 313 (120) 1,194 * Figures in parentheses represent tags returned from fish caught in Kern River and irrigation canals below Lake Isabella, t RTS = Shasta strain RTW = Whitney strain RTK-C = Coleman Kamloops present during tagging operations and placed undue stress on tagged fish. Thus, a differential mortality between tagged and untagged fish probably occurred, making mortality and survival estimates unreliable. Their smaller mean size and radically different length frequency (Fig- ure 1) may also have been a factor in reduced harvests (Weidlein 1971). DISCUSSION This study confirmed previous findings that Coleman Kamloops rain- bow trout proved superior when compared to the Whitney strain of domestic trout (Kawstron 1972). In the present study they w^ere def- initely superior not only to the Whitney but also the Shasta strain. In every test, they showed the highest survival rate while their annual 100 T 90 $5 80-- £ 70 t ^° + 50 + UJ > —I 30 o I0-- 1969. o— SHASTA WHITNEY — COLEMAN KAMLOOPS M 1970 FIGURE 9. Cumulative percentages of tog returns by month for three strains of tagged rain- bow trout planted in Lake Isabella in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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Keywords: ., bookauthorcaliforniadeptoffishandgame, bookauthorcaliforniafish
