. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 248 CALIFORNIA FISH AND GAME until the presenl time, , the tributary streams from the Merced River to the Cosumnes now supporl the entire San Joaquin River salmon runs. In 1948 and 1!>4!) the San Joaquin River system seaward migrants did not reach the Delta near Stockton until the first week in April. This was six weeks after those from the Sacramento River drainage began entering the Delta waters near Hood. During 1949, salmon
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 248 CALIFORNIA FISH AND GAME until the presenl time, , the tributary streams from the Merced River to the Cosumnes now supporl the entire San Joaquin River salmon runs. In 1948 and 1!>4!) the San Joaquin River system seaward migrants did not reach the Delta near Stockton until the first week in April. This was six weeks after those from the Sacramento River drainage began entering the Delta waters near Hood. During 1949, salmon fingerlings moved seaward through the lower San Joaquin and into the Delta while the stream flow was actually receding, and it continued to recede during the migration period. In 1955 the peak of the down- stream migration near Newman occurred between mid-March and mid- April. Thus, with the elimination of the early spawning spring run which formerly used the gravels above Mendota, and the storage of water at Friant, the juvenile salmon migration time pattern in the San Joaquin has changed considerably. During years of normal runoff, il formerly peaked near Stockton in February and it now peaks there around the last of March. Irrigation Season Records for the 10-year period (1946-55) show the irrigation season along the San Joaquin River between Stockton and the mouth of the Merced River to be principally between March and October, with some water diverted in February and November (Figure 9). Upstream, at Mendota, water is usually diverted during all months of the year. The monthly diversion of water in percentage of the seasonal total indicates that—between Stockton and the Merced River— percent is diverted in March. 14 percent in April, and 14 percent in May. About (iT percent is diverted from May through August, inclusive. On an average, about. y / y / ^ \ \ version in Percentage of Seasonal Total i \ ( Average I945"55) \ \ \ \ Salmon Losses in Diversions Sampl
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