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Spawning Biomass Of Pacific Sardine Sardinops Sagax Estimated From The Daily Egg Production Method Off California In 2013
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Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Estimated from the Daily Egg Production Method Off California in 2013 by : Emmanis Dorval
Download or read book Spawning Biomass of Pacific Sardine (Sardinops Sagax) Estimated from the Daily Egg Production Method Off California in 2013 written by Emmanis Dorval and published by . This book was released on 2014 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The 2013 daily egg production method (DEPM) survey was conducted within standard DEPM area (i.e., in the California Cooperative Fisheries Investigation, CalCOFI, sampling grid lines 60.0 - 95.0), encompassing the spawning core area of Pacific sardine off California from north of San Francisco to San Diego. The spawning biomass of the Pacific sardine (Sardinops sagax) in April 2013 was estimated from the DEPM based on two methods: 1) the traditional method where the egg production ( P 0 ) 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 144,880 mt (CV = 0.36) and 141,002 mt (CV = 0.34), respectively, within a total survey area of 141,397 km 2 (CalCOFI lines 63.3 - 91.7). The daily egg production estimate ( P 0 , an average weighted by area) was 1.34/.05m 2 (CV = 0.299). The estimates of female spawning biomass calculated by the two methods were 84,972 (CV = 0.33) and 82,182 mt (CV = 0.30), respectively"--Executive summary.
Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off California in 2004 and 1995 by : Nancy C. H. Lo
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.
Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off U.S. in 2011 by : Nancy C. H. Lo
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.
Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off California in 2009 by : Nancy C. H. Lo
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.
Book Synopsis Daily Egg Production and Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off California in 2001 by : Nancy C. H. Lo
Download or read book Daily Egg Production and Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off California in 2001 written by Nancy C. H. Lo and published by . This book was released on 2001 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Estimated from the Daily Egg Production Method Off California in 2015 by : Emmanis Dorval
Download or read book Spawning Biomass of Pacific Sardine (Sardinops Sagax) Estimated from the Daily Egg Production Method Off California in 2015 written by Emmanis Dorval and published by . This book was released on 2016 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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 (http://dx.doi.org/10.7289/V5/TM-SWFSC-560)]
Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off the U.S. in 2012 by : Nancy C. H. Lo
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.
Book Synopsis Biology and Ecology of Sardines and Anchovies by : Konstantinos Ganias
Download or read book Biology and Ecology of Sardines and Anchovies written by Konstantinos Ganias and published by CRC Press. This book was released on 2014-03-14 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Apart from being commercially and socially significant, anchovies and sardines populations occupy crucial positions in the oceans' ecosystems. Low in the food chain, clupeoids tend towards abundance, as if their purpose in life was to be eaten and fuel the upper levels of marine trophic chains. The present book covers a broad spectrum of topics on
Book Synopsis Sampling Rare or Elusive Species by : William Thompson
Download or read book Sampling Rare or Elusive Species written by William Thompson and published by Island Press. This book was released on 2013-04-10 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information regarding population status and abundance of rare species plays a key role in resource management decisions. Ideally, data should be collected using statistically sound sampling methods, but by their very nature, rare or elusive species pose a difficult sampling challenge. Sampling Rare or Elusive Species describes the latest sampling designs and survey methods for reliably estimating occupancy, abundance, and other population parameters of rare, elusive, or otherwise hard-to-detect plants and animals. It offers a mixture of theory and application, with actual examples from terrestrial, aquatic, and marine habitats around the world. Sampling Rare or Elusive Species is the first volume devoted entirely to this topic and provides natural resource professionals with a suite of innovative approaches to gathering population status and trend data. It represents an invaluable reference for natural resource professionals around the world, including fish and wildlife biologists, ecologists, biometricians, natural resource managers, and all others whose work or research involves rare or elusive species.
Book Synopsis Status of the Pacific Sardine (Sardinops Sagax) Resource in 1996 by :
Download or read book Status of the Pacific Sardine (Sardinops Sagax) Resource in 1996 written by and published by . This book was released on 1997 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of an Egg Production Method to Estimate the Spawning Biomass of Pacific Sardines Off Southern California in 1986 by : Cheryl L. Scannell
Download or read book Application of an Egg Production Method to Estimate the Spawning Biomass of Pacific Sardines Off Southern California in 1986 written by Cheryl L. Scannell and published by . This book was released on 1996 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Successes at the Interface of Ocean, Climate and Humans by : Nancy Knowlton
Download or read book Successes at the Interface of Ocean, Climate and Humans written by Nancy Knowlton and published by Frontiers Media SA. This book was released on 2020-12-30 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Book Synopsis Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off the U.S. in 2010 by : Nancy C. H. Lo
Download or read book Spawning Biomass of Pacific Sardine (Sardinops Sagax) Off the U.S. in 2010 written by Nancy C. H. Lo and published by . This book was released on 2010 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The estimates of spawning biomass of the Pacific sardine off California in 1994 - 2010 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, 392,00 mt, 117,000 mt, 185,000 and 108,000mt (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 the recent three years. 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 sardine"--summary.
Book Synopsis Status of the Spawning Biomass of the Pacific Sardine by :
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:
Book Synopsis The DEPM Estimation of Spawning-stock Biomass for Sardine and Anchovy by : Andrés Uriarte Seminario
Download or read book The DEPM Estimation of Spawning-stock Biomass for Sardine and Anchovy written by Andrés Uriarte Seminario and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of sardine spawning biomass off Portugal by egg production method by : Maria Emilia Cunha
Download or read book Estimation of sardine spawning biomass off Portugal by egg production method written by Maria Emilia Cunha and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Host Bibliographic Record for Boundwith Item Barcode 30112045766166 and Others by :
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 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
