Publication Date:
2021-06-29
Description:
This report covers the 39th annual inventory of chinook salman, Oncorhynchus tshawytscha, spawner populations in the Sacramento-San Joaquin River system." It is a compilation of reports estimating the fall-, winter-, late-fall-, and spring-run salman spawner populatiens fer streams which were surveyed.Estimates were made from counts of fish entering hatcheries and migrating past dams, from surveys of dead and live fish and redds on spawning areas, and from aerial counts.The estimated 1991 total escapement of chinook salmon in the Central Valley was 147,080 fish. This total consisted of 132,571 fall-, 5,921 spring-, 190 winter-, and 8,398 late-fall-run spawners. All of the spring-, late-fall-, and winter-run salmon were estimated to be in the Sacramento River system, while 1,176 fish of the fall run were in the San Joaquin River system.Spawner populations in all individual tributaries (except the American River) and the Sacramento River mainstem were lower than in 1990; but it should be noted that fall run populations in the Feather and Yuba rivers, two of the larger tributaries, were not surveyed that year. The winter run in the mainstem Sacramento River was at a record low level.(PDF contains 42 pages.)
Keywords:
Fisheries
;
Biology
;
chinook salmon
;
Oncorhynchus tshawytscha
;
spawner populations
;
fish populations
;
spawning area
;
Sacramento River system
;
Feather River
;
Yuba River
;
San Joaquin River system
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
