. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. .124 CALIFORNIA FISH AND GAME does not. seem probable that size at planting time has been the cause of the higher survival of the brown fingerlings. It is generally believed that the larger the fish are at planting time the greater the survival. This principle no doubt holds true in general for all trout species but there seem to be si)ecial cases when this is not so. Size is not the only important factor. The health of the fish when
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. .124 CALIFORNIA FISH AND GAME does not. seem probable that size at planting time has been the cause of the higher survival of the brown fingerlings. It is generally believed that the larger the fish are at planting time the greater the survival. This principle no doubt holds true in general for all trout species but there seem to be si)ecial cases when this is not so. Size is not the only important factor. The health of the fish when planted may be very important and we have some good reasons for thinking that the rainbow fingerlings, and possibly the brown and brook, have varied in health from year to year. The rainbow fingerlings in Castle Lake seem to be less wary than the browns and it would appear that this fact alone may be sufficient to account for the greater mortality. Speed of growth is naturally an important factor in determining survival in fishes because the faster a fish grows the sooner it will get out of the dangerous fingerling stage and attain a size which is less vulnerable to cannibalism. The rainbow brood stock is now undergoing selection for speed of growth and the fingerlings planted recently grow more rapidly than those planted early in the Castle Lake study. It must not be lost sight of, however, that selection for such obvious characters as speed of growth, spawning time and egg production may be attended by harmful qualities which might reduce the survival of the Fig. 32. Castle Lake, looking northeast toward Mt. Shasta. Survival of Fingerling Brook Trout The difference between the bro^vn and rainbow fingerling survival, while probably significant, was not great. The survival of the brook fingerlings is definitely lower than the others. The range for five year classes is from to about per cent with an average of per cent. Table 7 indicates some correlati
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