Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1990-91 spawning-ground surveys
1991
Spratt, Jerome D.
The spawning biomass of Pacific herring, Clupea pallasi,estimated from spawning-ground surveys in San Francisco Baydeclined to 45,850 tons this season, following a peak of71,000 tons in the 1989-90 season. This is the first majordecline since the 1983-84 El Nino.In Tomales Bay the 1990-91 spawning biomass more thandoubled to 779 tons. The spawning biomass has increasedthe past two seasons, while the fishery has been closed.There was no biomass estimate for Bodega Bay, but anadditional 95 tons of herring were caught in Bodega Baythis season. The total herring biomass for the Tomales-Bodega area is a minimum of 874 tons.Humboldt Bay was surveyed by the Department for the firsttime this season, and spawning biomass was estimated to be400 tons.January was the month of peak spawning activity in allspawning areas surveyed.In San Francisco Bay, 62% of all spawning occurred alonqthe San Francisco waterfront; for the first time therewas no significant spawninq in the northern part of the bay. Nearly 70% of the spawning activity in San Francisco Bay occurred on January 3-6, 1991.A total of 3.5 million m2 of eelgrass, Zostera marina,was measured in Tomales Bay this season. The change ineelgrass density this season varied from bed to bed, however the overall density of eelgrass in Tomales Bay declined. (44pp.)
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