. Chasse et pêche de la Californie. Pêche -- Californie ; jeu et jeu-oiseaux -- Californie ; Poissons -- Californie ; groupes de population animale ; pêches ; gibier, poissons. FISIIIOKV TIIH OK Pièces TtlK ET ABAISSER LA RIVIÈRE COLORADO 377. Fig. 72. Une capture de l'achigan à grande bouche ba.s.s de Martinez Lake, le 5 avril. 1942. Photographie par courtoisie de Joseph Lindsay. caus'ht dans les lacs de barrage impérial^ ci-dessus, et que leurs prises ont été limitées principalement à trois livres ou plus basse en poids. Ces obser- vations, si vrai, ne peut pas s'expliquer facilement. Une telle condition peut être due à n'importe quel nombre ou une (combinaison de plusieurs fac

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. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. TIIH FISIIIOKV OK TtlK LOWER COLORADO RIVER 377. Fig. 72. A catch of largemouth ba.s.s from Martinez Lake, April 5. 1942. Photograph through courtesy of Joseph Lindsay. caus'ht in tlie lakes above Imperial Dam, and that their catches have been restricted mainly to bass three pounds or over in weight. These observa- tions, if true, can not be explained easily. Such a condition could be due to any number or a (combination of several factors: overpopulation of other centrarchids; ])oor spawning seasons as because of water fluctua- tions, etc. Adult bass have but few enemies on the river other than man. Tliey prey on the other fishes and are believed to be largely responsible for the depletion of the native species. Other Fishes Which May be Present It is very likely that several other species of exotic fishes may be present in the lower river. Goldfish, Carassius auratus (Linn.), have been imported from fish dealers and kept in live-boxes at liake Ilavasu for use as bait. Fishermen have told me that fish have escaped from these boxes, and, of course, the possibility of escape from baited hooks is good. In the fall of 1942 a farmer informed me that he had "dumped several buckets of goldfish" into the Alamo River so that "the bass would have more feed. " Ooldfi.sh are well establislied in many waters of Califoi-nia, and it will be sur- prising if they are not or do not become residents of the Colorado. If so, they may be expected to compete with other fishes in somewhat the same manner as do carp. Their com])arative value as food competitors and as forage fish can not be ])rognosticated. "Buffalofish" 01" "buffalo-carp" liave been reported by residents as being caught at scA'eral places along the lower river (near Needles, below Parker, in the Imperial Valley). Some

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