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

Details

• Personal Author:
  Lo, Nancy C. H. ; Macewicz, Beverly J. ; Griffith, David A. (David Anthony)
• Corporate Authors:
  Southwest Fisheries Science Center (U.S.)
• NOAA Program & Office:
  NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)
• Description:
  "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.
• Content Notes:
  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).
• Series:
  NOAA-TM-NMFS-SWFSC ; 449
• Document Type:
  Technical Memorandum
• Place as Subject:
  California ; Pacific Coast
• Rights Information:
  Public Domain
• Compliance:
  Library
• Download URL:
  https://repository.library.noaa.gov/view/noaa/3921/noaa_3921_DS1.pdf
• File Type:
  [PDF - 2.56 MB]
• Collection(s):
  National Marine Fisheries Service (NMFS)
• Main Document Checksum:
  urn:sha-512:407a59a1ca25b021720374d40294c8de879ad6612d612c19ce9e8e8d5758787762b9429aa0348cda2696d923c587dff68c8f2a5eb3796dcb0da6b553ab75e583