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Spawning biomass of Pacific sardine (Sardinops sagax) estimated from the daily egg production method off California in 2015
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    "Fishery independent surveys are critical for assessing and managing Pacific sardine stocks along the North American Pacific coast. These surveys provide relative abundance indices to calibrate stock assessment and to monitor stock productivity as environmental conditions change. The Daily Egg Production method (DEPM) is one of two fishery-independent surveys that are currently used to assess the northern Pacific sardine stock from Ensenada to British Columbia and to set harvest guidelines for annual management in the USA. The DEPM was developed by Lasker (1985) to estimate the spawning stock biomass of northern anchovy (Engraulis mordax) based on growth, mortality and abundance of eggs and larvae, and the adult reproductive biology of this species. The method was later applied to assess the spawning of Pacific sardine off California from 1986 to 1996 (Wolf 1988a, Wolf 1988b, Lo et al. 1996, Scannel et al. 1996, Barnes et al. 1997). Since 2004, spawning biomass computed from the DEPM has been integrated in annual stock assessments of Pacific sardine by: 1) calculating the daily egg production from ichthyoplankton survey data; 2) computing the reproductive parameters of females from adult fish samples; and 3) calculating the biomass of spawning adults"--Introduction. [doi:10.7289/V5/TM-SWFSC-560 (]
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