Spawning biomass of Pacific sardine (Sardinops sagax) off California in 2009

"The spawning biomass of the Pacific sardine (Sardinops sagax) in April - May 2009 was estimated by the daily egg production method (DEPM) to be 185,084 mt (CV = 0.26) for an area of 274,895 km2 off California from San Diego to south of San Francisco (CalCOFI lines 95.0-63.3). The daily egg production estimate (P0) was 0.59/.05m2 (CV = 0.22), with the majority of eggs found south of Point Conception. The daily specific fecundity was calculated as 17.53 (number of eggs/population weight (g)/day) using the estimates of reproductive parameters from 467 mature female Pacific sardine collected from 29 positive trawls: F, mean batch fecundity, 29,790 eggs/batch (CV = 0.06); S, fraction spawning per day, 0.11 females spawning per day (CV = 0.15); Wf , mean female fish weight, 112.4 g (CV = 0.04); and R, sex ratio of females by weight, 0.602 (CV = 0.04)"--Summary. Nancy C.H. Lo, Beverly J. Macewicz, David A. Griffith. "October 2009." Mode of access: World Wide Web. System requirements: Adobe Acrobat Reader. Includes bibliographical references (p. 14-16).