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首页> 美国政府科技报告 >Spawning Biomass of Pacific Sardine (Sardinops Sagax) Estimated from the Daily Egg Production Method Off California in 2015.
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Spawning Biomass of Pacific Sardine (Sardinops Sagax) Estimated from the Daily Egg Production Method Off California in 2015.

机译：太平洋沙丁鱼（sardinops sagax）的产卵生物量估计来自2015年加利福尼亚州的每日鸡蛋生产方法。

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The 2015 daily egg production method (DEPM) survey for Pacific sardine (Sardinops sagax) was conducted in March/April off the west coast of the USA from about Winchester Bay, Oregon (43.75 degrees N) to Morro Bay, California (California Cooperative Fisheries Investigation, CalCOFI line 75.0). Pacific sardine eggs, larvae and adults were most abundant between 41.0 degrees N and 42.9 degrees N (north of Eureka, CA to north of Cape Blanco, OR) indicating that the stock was located outside of the spawning core traditional area, which has been mostly centered between north of San Francisco to San Diego (CalCOFI lines 60.0 - 93.0) over the last decade. The spawning biomass of the Pacific sardine in April 2015 was estimated from the DEPM based on two methods: (1) the traditional method where egg production (P0) was a weighted mean, and each adult parameter was an unstratified estimate; and (2) a stratified procedure where the estimate of total spawning biomass is the sum of the estimated spawning biomass in each of two regions representing high and low spawning activity. The two estimates of the spawning biomass were 33,412 mt (CV = 0.74) and 39,495 mt (CV = 0.56), respectively within a total survey area of 181,250 km2. The daily egg production estimate (P0, an average weighted by area) was 0.17/.05m2 (CV = 0.72). The estimates of female spawning biomass calculated by the two methods were 16,207 (CV = 0.74) and 19,376 (CV = 0.58), respectively.

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