Download or read book Status of the Spawning Biomass of the Pacific Sardine 1977 78 written by Richard A. Klingbeil and published by . This book was released on 1978 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the Spawning Biomass of the Pacific Sardine written by and published by . This book was released on 1977 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the Spawning Biomass of the Pacific Sardine written by and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the Spawning Biomass of the Pacific Sardine 1978 79 written by Richard A. Klingbeil and published by . This book was released on 1979 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the Spawning Biomass of the Pacific Sardine 1979 80 written by Richard A. Klingbeil and published by . This book was released on 1980 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book California Cooperative Oceanic Fisheries Investigations Progress Report written by and published by . This book was released on 1992 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Host Bibliographic Record for Boundwith Item Barcode 30112045766166 and Others written by and published by . This book was released on 2013 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spawning Biomass of Pacific Sardine Sardinops Sagax Off California in 2004 and 1995 written by Nancy C. H. Lo and published by . This book was released on 2004 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.
Download or read book Collected Reprints written by Southwest Fisheries Center (U.S.) and published by . This book was released on 1986 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Resources Administrative Report written by and published by . This book was released on 1979 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book California State Publications written by California State Library and published by . This book was released on 1981 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collected Reprints written by and published by . This book was released on 1990 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography and Literature Database written by and published by . This book was released on 1989 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spawning Biomass of Pacific Sardine Sardinops Sagax Off U S in 2011 written by Nancy C. H. Lo and published by . This book was released on 2011 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spawning biomass of the Pacific sardine (Sardinops sagax) in April 2011 was estimated using the daily egg production method (DEPM) calculated by two methods: 1) the traditional method where the egg production (P0) was a weighted mean while 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 383,286 mt (CV = 0.32) and 373,348 mt (CV = 0.28), respectively, for the standard DEPM survey area of 314,480.69 km2 off the west coast of North America from San Diego, California to north of San Francisco, California (CalCOFI line 60.0-95.0). The daily egg production estimate (P0, a weighted average with area as the weight) was 1.16/.05m2 (CV = 0.26). In the standard DEPM area, the estimates of female spawning biomass calculated by the two methods were 225,155 mt (CV = 0.32) and 219,386 mt (CV = 0.28), respectively. A small region close to Astoria, Oregon (47.1° - 45.9°N) was sampled for sardines. No eggs and only 2 immature sardine were collected in this area. Hence, coastwide estimates of sardine spawning biomass and female spawning biomass were not calculated. The estimated daily specific fecundity was 19.04 (number of eggs/population weight (g)/day) using the following estimates of reproductive parameters from 244 mature female Pacific sardines collected from 30 positive trawls: F, mean batch fecundity, 38,369 eggs/batch (CV = 0.07); S, fraction spawning per day, 0.1078 females spawning per day (CV = 0.18); Wf , mean female fish weight, 127.6 g (CV = 0.05); and R, sex ratio of females by weight, 0.587 (CV = 0.06). Since 2005, trawling has been conducted randomly or at CalCOFI stations, which resulted in sampling adult sardines in both high (Region 1) and low (Region 2) sardine eggdensity areas. During the 2011 survey, the number of tows positive for mature female sardines was similar in Regions 1 and 2 (14 and 16 respectively), while four tows in Region 2 contained solely immature sardines. The estimates of spawning biomass of the Pacific sardine off California in 1994 - 2011 based on the traditional method 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, 485,000 mt, 300,000 mt, 600,000 mt, 837,000 mt, 392,000 mt, 117,000 mt, 185,000, 108,000mt and 383,000 mt (for the standard DEPM area), respectively. These estimates of spawning biomass indicate that there has been considerable fluctuation during this time (the peaks occurred in 2000 and 2006) and that biomass has declined in 2008-2010 and increased in 2011. The time series of spawning biomass was one of the fishery-independent inputs to the annual stock assessment of the Pacific sardine from 1985 - 2008. Since 2009, the time series of spawning biomass was replaced by female spawning biomass for years when sufficient trawl samples were available and the total egg production for other years as inputs to the stock assessment of Pacific sardines.
Download or read book Spawning Biomass of Pacific Sardine Sardinops Sagax Off California in 2009 written by Nancy C. H. Lo and published by . This book was released on 2009 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.
Download or read book Spawning Biomass of Pacific Sardine Sardinops Sagax Off the U S in 2012 written by Nancy C. H. Lo and published by . This book was released on 2013 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The spawning biomass of the Pacific sardine (Sardinops sagax) in April 2012 was estimated using the daily egg production method (DEPM) calculated by two methods: 1) the traditional met hod where the egg production (P0) was a weighted mean while 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 282,110 mt (CV=0.43) and 255,391 mt (CV = 0.32 ), respectively, for the standard DEPM survey area of 270,991 km2 off the west coast of North America from north of San Francisco to San Diego, California, California (CalCOFI line 60.0 - 95.0). The daily egg production estimate ( P0, an average weighted by area) was 0.84 /.05m2 (CV = 0.27). In the standard DEPM area, the estimates of female spawning biomass calculated by the two methods were 120,902 mt (CV = 0.3 6) and 113,178 mt (CV = 0.27), respectively. Samples taken north of CalCOFI line 60 found no eggs in either CalVET tows or CUFES collections, and one trawl out of three caught sardines north of CalCOFI line 60 during the R/V Ocean Starr cruise. Hence, coastwide estimates of sardine spawning biomass and female spawning biomass were not calculated"--summary.
Download or read book The Ecology of Marine Fishes written by Dr. Larry G. Allen and published by Univ of California Press. This book was released on 2006-02-15 with total page 1353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine fishes have been intensively studied, and some of the fundamental ideas in the science of marine ecology have emerged from the body of knowledge derived from this diverse group of organisms. This unique, authoritative, and accessible reference, compiled by 35 luminary ecologists, evolutionary biologists, and ichthyologists, provides a synthesis and interpretation of the large, often daunting, body of information on the ecology of marine fishes. The focus is on the fauna of the eastern Pacific, especially the fishes of the California coast, a group among the most diverse and best studied of all marine ecosystems. A generously illustrated and comprehensive source of information, this volume will also be an important launching pad for future research and will shed new light on the study of marine fish ecology worldwide. The contributors touch on many fields in biology, including physiology, development, genetics, behavior, ecology, and evolution. The book includes sections on the history of research, both published and unpublished data, sections on collecting techniques, and references to important earlier studies.
