. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 138 CALIFORNIA FISH AND GAME ponchveed (Potamogeton gramineus, J', graminifolkis, and P. longi- pediculatus), averaging about 25 feet from At times, the dense plant life hindered swimming, boating and fishing in the lake. A plankton Bample indicated an abundance of this basic food for the lake, particularly in water fleas (Daphnia) and copepods (Cyclops and Diaptomus). Various bottom and marginal foods were also abundant
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 138 CALIFORNIA FISH AND GAME ponchveed (Potamogeton gramineus, J', graminifolkis, and P. longi- pediculatus), averaging about 25 feet from At times, the dense plant life hindered swimming, boating and fishing in the lake. A plankton Bample indicated an abundance of this basic food for the lake, particularly in water fleas (Daphnia) and copepods (Cyclops and Diaptomus). Various bottom and marginal foods were also abundant to common. It is little wonder then, with abundant food and shelter, that the rough fish grew fat and numerous, safe from both i rout and anglers. Until 1933, loch leven (Salmo trutta) were the only trout planted in the hike. Later, rainbow (Salmo gairdnerii) superseded the lochs and became the main basis of the sport Pig. 40. Cube mud is trolled over side of power boat travelling at moderate speed. Note "fan" of poison cloud behind boat. Photograph by author, November 5, 1941. Chemical Treatment Following detailed preparations and instruction of personnel, Crystal Lake was formally treated with cube (Lonchocarpus utilis) powder, containing 5 per cent rotenone, on November 5, 1941. The method used in treatment was essentially the same as for control of rough fish in Gull Lake,4 in which the lake was divided to facilitate uniform distribution of the chemical; the powder was mixed with water at supply stations on shore to resemble thick waffle batter and then trolled through the lake in wet burlap sacks behind two-man power 3 For species identifications of aquatic plants collected I am indebted to Mr. Charles Miller of the Bureau of Fish Conservation, California Division of Fish and Game. * Vestal, Elden H., Rough fish control in Gull Lake, Mono County, California California Fish and Game, Vol. 28, pp. 34-61, Please note that these images are extracte
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