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Reproductive Potential Of Snow And Tanner Crab In Alaska
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Book Synopsis Reproductive Potential of Snow and Tanner Crab in Alaska by : Joel Benjamin Webb
Download or read book Reproductive Potential of Snow and Tanner Crab in Alaska written by Joel Benjamin Webb and published by . This book was released on 2014 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fisheries for snow (Chionoecetes opilio) and Tanner (C. bairdi) crab in Alaska are managed with large male only harvest regulations. Management of sex-selective crab fisheries could be enhanced by improved understanding of the functional relationship between male harvest and female reproductive potential. This research advances knowledge of factors associated with variation in reproductive potential by characterizing factors influencing female sperm reserves for Tanner crab, identifying factors associated with variability in fecundity for female snow crab in the eastern Bering Sea (EBS), and developing refined indices of egg (embryo) production and recruitment for snow crab that revealed a positive functional relationship that has not been previously described for this stock. Sperm reserves of female Tanner crab varied with mature female ontogeny, sex ratio, and harvest. Increasing exploitation rate is associated with decreased average sperm reserves of primipara (first reproductive cycle) while increased availability of large, sexually-dominant, adult males, was associated with increased cumulative sperm reserves for multipara (second or greater reproductive cycle) among Tanner crab stocks. A white-layer of fresh ejaculate in the spermathecae (sperm-storage organ) was a robust indicator of increased sperm reserves in both primiparous and multiparous females and is likely a useful tool for evaluating risk of sperm limitation in Chionoecetes. Fecundity of female snow crab in the EBS was influenced by both intrinsic and extrinsic factors. Fecundity increased with increasing female size and decreased for older multipara likely due to senescence. Variability in fecundity-at-size was higher among multipara than primipara and this may be associated with contrasting mating dynamics, tempo of reproduction, maternal age, or environmental influences on maternal condition. Mating success may also influence fecundity of multiparous females; females with fresh ejaculate had higher fecundity (~10%) than those that did not. Substantial embryo loss during brooding was not observed for snow crab, and embryo quality did not vary with female size or age relative to maturity. Refining indices of female reproductive potential with demographic and fecundity information resulted in reduced estimates of reproductive output. A positive functional relationship between reproductive potential and recruitment was detected at a lag of four years due to coherence between high reproductive output in the late 1980s and strong recruitment in the early 1990s. Stock productivity reached a minimum thereafter, preceding a rapid decline in mature abundance.
Book Synopsis Investigations on Reproductive Potential of Snow and Tanner Crab Females from the Eastern Bering Sea in 2005 by : Kirsten A. Gravel
Download or read book Investigations on Reproductive Potential of Snow and Tanner Crab Females from the Eastern Bering Sea in 2005 written by Kirsten A. Gravel and published by . This book was released on 2007 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses the stock reproductive potential of mature snow crab, Chionoecetes opilio, and Tanner crab, C. bairdi, females which were collected from the eastern Bering Sea during the summer of 2005.
Book Synopsis Reproductive Potential of Female Eastern Bering Sea Tanner Crab by : Michael Knutson (Fishery biologist)
Download or read book Reproductive Potential of Female Eastern Bering Sea Tanner Crab written by Michael Knutson (Fishery biologist) and published by . This book was released on 2020 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Changes in abundance and sex ratio can contribute to variation in the reproductive potential of a population. The commercially important Bering Sea Tanner crab (Chionoecetes bairdi) are distributed throughout the north Pacific Ocean and display cyclical population dynamics. The goal of this study was to examine how fishing pressures and population dynamics affected the reproductive potential of Bering Sea Tanner crab to better inform sustainable fishery management. I quantified female stored sperm levels and fecundity for both primiparous (in their first reproductive cycle) and multiparous (in their second or later reproductive cycle) crab to examine spatial and temporal variation in reproductive potential. Multiparous female crab had higher spermathecal load than primiparous ones, but spermathecal load varied widely across female size. Higher sperm cell counts were associated with visual indication of fresh ejaculate for primiparous crab but not for multiparous crab. Sperm cell counts increased with increasing spermathecal load for both primiparous and multiparous crab, although the slope of the regression line varied for the two categories. Female fecundity was highest in crab in their second year after the terminal molt to maturity and was lower in the first year and in the third and subsequent years. Female fecundity (size-corrected) did not differ among management areas. Measures of mature female sperm storage and quantification of reproductive stage can provide fishery managers with an early warning of reproductive failures.
Book Synopsis New Frontiers in Crustacean Biology by :
Download or read book New Frontiers in Crustacean Biology written by and published by BRILL. This book was released on 2011-06-09 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the Proceedings of The Crustacean Society Summer Meeting held between 20 and 24 September 2009 in Tokyo, Japan. It is the world's premier event on crustacean biology and organized under the auspices of the Carcinological Society of Japan and The Crustacean Society. It reports presentations of plenary keynote addresses, special symposia, and contributed papers given at the meeting, all of which have been peer reviewed and edited. The book represents some of the best research from leading international researchers from all over the world and presents major reviews of all areas of crustacean research, including systematics, evolution, ecology, behaviour, development, physiology, symbiosis, genetics, biogeography, palaeobiology, fisheries, and aquaculture.
Book Synopsis Tanner Crab Off Alaska, Fisheries Management Plan (FMP) by :
Download or read book Tanner Crab Off Alaska, Fisheries Management Plan (FMP) written by and published by . This book was released on 1977 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crabs in Cold Water Regions by : A. J. Paul
Download or read book Crabs in Cold Water Regions written by A. J. Paul and published by Alaska Sea Grant College Program. This book was released on 2002 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international group of specialists presented these 53 papers at the sixth crab symposium in the Lowell Wakefield symposium series at the U. of Alaska in January of 2001. The main themes include crab life cycles, reproductive biology and behavior, recruitment and population dynamics, fisheries and stock assessment, environment and habitat, and fisheries management. Individual papers present the results of research on topics that include the bitter crab syndrome in Tanner crab, re-stratification of red king crab assessment, population structure of blue king crab, habitat use by juvenile crabs, the impact of the European green crab in the Pacific, and use of tag recapture data to estimate natural mortality. Annotation copyrighted by Book News, Inc., Portland, OR.
Book Synopsis Tanner Crab Off Alaska, Fisheries Management Plan (FMP) by :
Download or read book Tanner Crab Off Alaska, Fisheries Management Plan (FMP) written by and published by . This book was released on 1977 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Federal Register written by and published by . This book was released on 1978-05 with total page 1482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundfish Total Allowable Catch Specifications and Prohibited Species Catch Management Plans for the Groundfish Fishery of the Bering Sea and Aleutian Islands Area and Groundfish of the Gulf of Alaska by :
Download or read book Groundfish Total Allowable Catch Specifications and Prohibited Species Catch Management Plans for the Groundfish Fishery of the Bering Sea and Aleutian Islands Area and Groundfish of the Gulf of Alaska written by and published by . This book was released on 1998 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis King and Tanner Crabs, East Bering Sea, PMP by :
Download or read book King and Tanner Crabs, East Bering Sea, PMP written by and published by . This book was released on 1977 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Bering Sea Tanner Crab Resource by : Alaska Sea Grant Program
Download or read book The Bering Sea Tanner Crab Resource written by Alaska Sea Grant Program and published by . This book was released on 1977 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aspects of the Reproductive Biology of Female Snow Crabs, Chionoecetes Bairdi, from Prince William Sound, Alaska by : John R. Hilsinger
Download or read book Aspects of the Reproductive Biology of Female Snow Crabs, Chionoecetes Bairdi, from Prince William Sound, Alaska written by John R. Hilsinger and published by . This book was released on 1975 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reproductive biology of the female snow crab, Chionoecetes bairdi, from Prince William Sound, Alaska is examined. Size at 50% maturity is 80 mm carapace width. All but a few females undergo a terminal anecdysis after maturity. Primiparous spawners molt to maturity and mate in winter or early spring while multiparous spawners extrude their eggs in May. Egg hatching occurs in both groups in April or May. All recently molted females and 90% of the old shell females are ovigerous. Egg number decreases from an average of 169,000 eggs per female after extrusion to 133,000 eggs per female before hatching. The ratio of females to males increases with size. This relationship is used to predict a ratio of 2.1 females per male at 96 mm, the average size of adult females. A comprehensive bibliography is given on the genus Chionoecetes.
Book Synopsis Some Aspects of Reproductive Biology of the Crab Chionoecetes Bairdi by : A. J. Paul
Download or read book Some Aspects of Reproductive Biology of the Crab Chionoecetes Bairdi written by A. J. Paul and published by . This book was released on 1983 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Commercial Tanner Crab Fishery Fisheries Management Plan (FMP), Amended to Include Amendment 7 by :
Download or read book Commercial Tanner Crab Fishery Fisheries Management Plan (FMP), Amended to Include Amendment 7 written by and published by . This book was released on 1981 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reproductive Buffers on Exploitation in Male-only Fisheries by : Madison Anne Shipley
Download or read book Reproductive Buffers on Exploitation in Male-only Fisheries written by Madison Anne Shipley and published by . This book was released on 2020 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eastern Bering Sea Tanner crab (Chionoecetes bairdi), one of Alaska's more cyclical fisheries, has one of the most complex harvest strategies of any Bering Sea-Aleutian Islands crab stock. This stock experiences major fluctuations in annual abundance and, although a male-only fishery, the state harvest control rule (HCR) used to set the allowable catch depends on the abundance of females. Failure to meet minimum thresholds on female abundance has led to fishery closures during five of the last ten fishing seasons. The economic performance of the fishery, linked to its frequent closures required by current management regulations, led to an industry-initiated effort to modify the state HCR to better account for stock status and reduce large inter-annual changes in catch, as well as to evaluate the utility of including mature female biomass in the HCR. A workshop involving stakeholders, university affiliates, and managers concluded that management strategy evaluation was the most appropriate way to test candidate HCRs. Fifteen HCRs with various levels of incorporation of female stock levels (from primary to ignored) were tested using 100-year forecasts to evaluate how including females in harvest policies affected stock sustainability and productivity based on conservation and economic criteria. Several male-only HCRs performed similarly to HCRs that accounted for females, including those using mature female biomass (MFB) to determine the maximum exploitation rate on mature male biomass (MMB) as part of the HCR rather than as a threshold to open the fishery. HCRs including both sexes appropriately balanced conservation and economic considerations while acknowledging the uncertainty around reproductive dynamics given the lack of an identified stock-recruitment relationship. The harvest policy selected by the Alaska Board of Fisheries included: 1) a threshold for opening the fishery of 25% of average MMB during 1982--2018, 2) an exploitation rate for males based on the ratio of MMB to its long-term average, and 3) a maximum exploitation rate determined by the ratio of MFB to average MFB during 1982-2018. This HCR also included a maximum exploitation of 50% of exploitable, industry-preferred size legal male abundance.
Author :Alaska Sea Grant College Program Publisher :Computer Technology Research Corporation ISBN 13 : Total Pages :736 pages Book Rating :4.:/5 (318 download)
Book Synopsis High Latitude Crabs by : Alaska Sea Grant College Program
Download or read book High Latitude Crabs written by Alaska Sea Grant College Program and published by Computer Technology Research Corporation. This book was released on 1995 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings builds on knowledge brought together during four previous north latitude crab symposia, and has recommendations for future crab research. Forty-eight papers were presented at the 1995 symposium in Anchorage, Alaska. Research is included from Argentina, Australia, Canada, Japan, Norway, Russia, and the United States. Long-term goals of the symposium are to better conserve the resource, strengthen the industry, and provide accessible healthful protein to the consumer. Winner of a Gold Award for editing, Agricultural Communicators in Education.
Book Synopsis Fishery Management Plan and Environmental Impact Statement for the Tanner Crab Off Alaska by : North Pacific Fishery Management Council
Download or read book Fishery Management Plan and Environmental Impact Statement for the Tanner Crab Off Alaska written by North Pacific Fishery Management Council and published by . This book was released on 1977 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
