Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 4991
Title: Egg production of Pacific sardine (Sardinops sagax) off Oregon in 1994
Author: Paul J. Bentley, Robert L. Emmett, Nancy C. H. Lo, H. G. Moser
Publication Year: 1996
Journal: California Cooperative Oceanic Fisheries Investigations Reports
Volume: 37
Pages: 193-200

Since the late 1970s, the Pacific sardine (Sardinops sagax) population off the west coast of the United States has been increasing.  In 1994, an ichthyoplankton survey to assess anchovy biomass was conducted off the Oregon coast from the Columbia River to the Coquille River (just north of Cape Blanco) and out to 190 km offshore.  Samples collected during the survey contained numerous Pacific sardine eggs and larvae, which were used to estimate daily egg production (0.42 eggs/0.05 m2/day) and egg mortality (0.13/day).  The spawning biomass of Pacific sardine was calculated to be about 50,000 MT.  There appears to be an association between geographic distribution of sardine eggs and the 14°C isotherm derived from the 1–m to 10–m depth zone.  We hypothesize that the isotherm of 14°C forms a distinct boundary for spawning sardine off Oregon and may prove useful for determining boundaries for future spawning surveys.   

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