. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 32 FISH AND GAME COMMISSION Studies of Young Salmon: Fyke-netting studies of downstream migrants have included studies of the time of migration in the Feather, American, Cosumnes, Mokelumne, and San Joaquin Rivers, and studies of the damage done by various large unscreened and inadequately screened irrigation diversions. The diversions are all taking salmon, but the ones in the Mendota area are the Figure 10. Fyke net being us
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 32 FISH AND GAME COMMISSION Studies of Young Salmon: Fyke-netting studies of downstream migrants have included studies of the time of migration in the Feather, American, Cosumnes, Mokelumne, and San Joaquin Rivers, and studies of the damage done by various large unscreened and inadequately screened irrigation diversions. The diversions are all taking salmon, but the ones in the Mendota area are the Figure 10. Fyke net being used to estimate the loss of baby salmon into a canal. The canal was taking very little water when this photograph was made and practically the entire flow was going into the fyke net. Photograph by Donald H. Fry, Jr. Electric Screen Testing: Since the cost of screening irrigation canals, particularly the largest ones, by fine mesh screens (rotary drum or similar) would be almost prohibitive, the Fish and Game Commission decided to investigate the possibilities of electrical screening. Two screens were installed at Mendota and one at Dos Palos. Intensive tests carried out when small salmon were migrating in the early part of 1946 showed that the screens as purchased would not keep small salmon out of the canals, but frequent changes made by the manufacturer and the division have resulted in improved performance, and give hope that eventually such methods may prove adequate. It should be kept in mind that small fish are much harder to deflect electrically than large ones, and that fish which are actively migrating are much harder to turn than ones which are merelj'' wandering. Thus it will be seen that screening of small salmon electrically is a very difficult problem which must be approached with 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 m
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