. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 116 CALIFORNIA FISH AND GAME. Fig. 30. Brown trout and mackinaw weighing- seven and nine pounds respec- tively. Tliis is the largest brown trout recorded from Castle Lake. Largest macki- naw recorded weighed slightly less than twenty pounds. Photo 1939. than do the last two species. Tims if the browns were not present in the lake the survival rate of either rainbow or brook might be greater than that of the browns at the present time.
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 116 CALIFORNIA FISH AND GAME. Fig. 30. Brown trout and mackinaw weighing- seven and nine pounds respec- tively. Tliis is the largest brown trout recorded from Castle Lake. Largest macki- naw recorded weighed slightly less than twenty pounds. Photo 1939. than do the last two species. Tims if the browns were not present in the lake the survival rate of either rainbow or brook might be greater than that of the browns at the present time. This point will be cleared by future experiments but at the present time the brown trout in Castle Lake has a relatively high survival rate. The brown trout makes little use of the plankton in Castle Lake, feeding largely upon in- sects and to some extent upon young fish. Natural reproduction in this species is ineffective al- though spawning fish have been found around springs in the lake and in the outlet stream. Fig. 31 shows clearly that despite nearly equal plants of the three species the fishermen catch many more browns than any of the other species. At present this does not seem to mean that this species is necessarily the best one for Castle Lake. It does mean, however, that with the present mixture of all four species of trout the brown are best able to care for themselves. Although the brown are not quite as gamey as the rainbow they are well regarded by the majority of anglers at this lake. Rainbow Trout This species is the only one of the four which is native to the region but it is typically a stream rather than a lake species. Nevertheless it has been planted in all types of lakes in California and has been success- ful in most. The average survival rate of rainbow fingerlings planted in Castle Lake is not quite as high as that of the brown but it is con- siderably better than that of the brook trout. When planted as yearlings the survival to the angler is also
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