| Spawning biomass of Pacific sardine (Sardinops sagax) off California in 2004 and 1995 - :4661 | National Marine Fisheries Service (NMFS)
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Spawning biomass of Pacific sardine (Sardinops sagax) off California in 2004 and 1995
  • Published Date:
    2004
Filetype[PDF-1.34 MB]


Details:
  • Corporate Authors:
    Southwest Fisheries Science Center (U.S.)
  • Description:
    "The daily egg production of Pacific sardine (Sardinops sagax) off California from San Diego to San Francisco was estimated to be 0.96/0.05m² (CV = 0.24). The spawning biomass was estimated to be 281,639.27 metric tons (mt, CV = 0.3) for an area of 320,619.8 km², using the daily specific fecundity (number of eggs/population weight (g)/day of 21.86 compared to 23.55 used in the years prior to 2002 and 22.94 from the 2002 cruise). The area (320,620 km²) is similar to that in 2003 (365,906 km²). We also revisited sardine egg data collected during the April 1995 CalCOFI survey. The daily egg production for 1995 was 0.83/0.05m2 (CV = 0.5) for an area of 113,189 km². Using the daily specific fecundity from 1986-1994: 23.55 eggs/gram/day, the estimate of the spawning biomass in 1995 was 79,997 mt (CV = 0.6). The estimates of spawning biomass of Pacific sardine in 1994 - 2004 are 127,000 mt, 80,000 mt, 83,000 mt, 410,000 mt, 314,000 mt, 282,000 mt, 1.06 million mt, 791,000 mt, 206,000 mt, and 485,000 mt, 300,000 mt respectively. Therefore, the estimates of spawning biomass have been fluctuating and increasing since 1994"--Summary.

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