Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1991-92 spawning-ground surveys

Spratt, Jerome D. and Moore, Thomas O. and Collier, Patrick (1992) Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1991-92 spawning-ground surveys. Monterey, CA, California Department of Fish and Game, Marine Resources Division, (Marine Resources Administrative Report, 92-2)

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Abstract

The spawning biomass of Pacific herring, Clupea pallasi, estimated from spawning-ground surveys in San Francisco Bay declined to 41,000 tons this season. This was the second consecutive year that the San Francisco Bay herring population estimate has declined. In Tomales Bay, the 1991-92 season spawning biomass estimate, including the catch of 24 tons from Bodega Bay, was 1,238 tons. This was the third consecutive season that the Tomales-Bodega area herring population has increased. The 1991-92 Humboldt Bay herring spawning biomass estimate of 225 tons, was nearly half of last season's estimate of 400 tons. December and January were the peak months of spawning activity in all areas surveyed. In San Francisco Bay, the first major spawn since the 1981-82 season occurred in the Sausalito area, and the Oakland-Alameda area accounted for 50% of all spawning activity. A total of 3.5 million m2 of eelgrass, Zostera marina, was measured in Tomales Bay this season. The eelgrass density declined in most beds this season. (46p.)

Item Type: Monograph or Serial Issue
Title: Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1991-92 spawning-ground surveys
Personal Creator/Author:
CreatorsEmail
Spratt, Jerome D.
Moore, Thomas O.
Collier, Patrick
Series Name: Marine Resources Administrative Report
Number: 92-2
Date: 1992
Publisher: California Department of Fish and Game, Marine Resources Division
Place of Publication: Monterey, CA
Latitude: 38.1011
Longitude: 122.544
Issuing Agency: California Department of Fish and Game
Uncontrolled Keywords: Pacific herring; Clupea pallasi
Subjects: Management
Fisheries
Biology
Item ID: 365
Depositing User: Joan Parker
Date Deposited: 19 Oct 2007 19:58
Last Modified: 29 Sep 2011 22:10
URI: http://aquaticcommons.org/id/eprint/365

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