. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. at the head of a steep gorge and the problem of get- ting fish by both gorge and dam was a difficult one. Establishment of a run by transplanting ripe adults into such a stream was attempted. In cooperation with the U. S. Fish and Wildlife Service's Coleman Station personnel, 1,428 adult king salmon were trapped at Keswick Dam on the Sacramento River, and released in Clear Creek above the dam. Survey crews observed later, and some wer
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. at the head of a steep gorge and the problem of get- ting fish by both gorge and dam was a difficult one. Establishment of a run by transplanting ripe adults into such a stream was attempted. In cooperation with the U. S. Fish and Wildlife Service's Coleman Station personnel, 1,428 adult king salmon were trapped at Keswick Dam on the Sacramento River, and released in Clear Creek above the dam. Survey crews observed later, and some were cap- tured for identification. Complete results of this ex- periment will not be available until after 1957, when most of the fish that are going to return will have done so. By the time the fish return, the department plans to have an adequate fish ladder completed through the gorge and over the dam. JACK MACKEREL The meteoric rise of the jack mackerel fishery in 1947 was attributable in a large part to the almost complete failure of the sardine fishery and the dimin- ishing Pacific mackerel landings. A second important factor was the increased use of depth-sounding devices for locating schools of fish not visible at the surface. After seven years of fairly heavy fishing effort the fishery is now confined almost exclusively to Southern California because the jack mackerel have disappeared from other waters. During the years 1947 to 1950, Monterey was a fairly important port of landing but since 1950 the contribution from that area has been of little significance. The catch since 1947 has fluctuated almost yearly" with little correlation to observed con- ditions. Preliminary age work completed during the bien- nium indicates the commercial fishery is largely de- pendent upon fish ranging from one to four years of age. Fish of this age vary in size from about five to 14 inches. Each year, however, several purse seine loads of very large jack mackerel are taken and these
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