Download or read book Conservation of Spiny Dogfish Squalus Acanthias written by Mary Lack and published by . This book was released on 2006 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trade in and Conservation of Two Shark Species Porbeagle Lamna Nasus and Spiny Dogfish Squalus Acanthias written by Sarah Fowler and published by . This book was released on 2004 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The International Trade and Fishery Management of Spiny Dogfish Squalus Acanthias in Light of CITES List Insertion written by Andrea Dell'Apa and published by . This book was released on 2013 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spiny dogfish (Squalus acanthias) is a commercial shark species that was recently considered, unsuccessfully, for inclusion in trade-regulation lists due to international concern about its conservation status. The major commercial demand for the species is from Europe, where the Northeast Atlantic stock has been managed unsuccessfully because of dysfunctionalities of EU fishery governance. The demand from the EU market is primarily for adult females, with the U.S. North Atlantic stock being one of the major contributors to this market. This primarily female fishery has led to overexploitation and a drastic reduction in both adult female biomass and juvenile recruitment in the U.S. Atlantic stock, forcing the adoption of a Fishery Management Plan (FMP) under the requirements of the U.S. fishery management system. The stock is now considered rebuilt and the U.S. Atlantic spiny dogfish fishery was recently certified as sustainable. However, new management strategies are needed to maintain fishery sustainability in the long-term. The first objective of this study was to analyze the EU trade dynamic changes associated with the introduction of the FMP by employing social network analysis. Results indicate that the EU market demand favoured the development of dogfish fisheries in several countries in order to supply to the decrease in U.S. export, eventually affecting the global conservation status of the species. Moreover, the species listing for trade regulation would benefit the U.S. and will enhance the conservation of other regional stocks worldwide. The second objective of this study was to investigate on the sex ratio changes in fishery-dependent surveys conducted off Cape Cod, Massachusetts; and to evaluate these results in light of the sexual segregation occurring in the species. Results support the development of a male-only directed fishery off the northeast portion of the Cape Cod peninsula, based on season (summer and early fall) and time of the day (early morning). This fishery would likely enhance the sustainability of the local spiny dogfish populations by reducing fishing pressure on the adult female component. Finally, results suggest that sexual segregation in S. acanthias off Cape Cod corresponds to female avoidance of males, coupled with specific mating and/or feeding behavior by males.
Download or read book Life History Demography and Ecology of the Spiny Dogfish Squalus Acanthias in the Gulf of Alaska written by Cindy Ann Tribuzio and published by . This book was released on 2010 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The spiny dogfish (Squalus acanthias) is a small, cosmopolitan shark species, common in sub-tropical and sub-arctic waters. The species is often targeted commercially in most areas of the world throughout it's range, and in some cases it is overfished or the subject of conservation concern. In the Gulf of Alaska, spiny dogfish are not targeted and not generally retained, but incidental catches can be high for this schooling species. Previously, biological parameters for spiny dogfish in the Gulf of Alaska were assumed from estimates for this specie's neighboring areas, including British Columbia and Washington State. The purpose of this study was to examine spiny dogfish in the Gulf of Alaska and estimate important parameters for stock assessment in four stages: (1) general biology, distribution, and life history; (2) modeling age and growth; (3) population demographic modeling; and (4) ecological interactions revealed by diet analysis. Spiny dogfish are similar in length in the Gulf of Alaska to neighboring regions, but mature at larger sizes and have a greater fecundity than reported elsewhere. There is high natural variability in estimated ages for the species, which is reflected in the poor lit of the growth models, possibly owing to measurement error from using the dorsal fin spine as the aging structure. A two-phase growth model provided the statistical best fit. However, questions were raised about the biological interpretation of the model and whether more traditional models (e.g., von Bertalanffy and Gompertz) may be more appropriate. Using the life-history and growth data, Leslie matrix type, age- and stage based demographic models were created to estimate sustainable fishing mortality rates and to examine the risk of harvest scenarios. Female Gulf of Alaska spiny dogfish can support up to a 3% annual harvest rate; fisheries that target juveniles have the greatest risk of population decline below threshold levels. Spiny dogfish are generalist opportunistic feeders that feed on whichever prey is available, however shrimp are the most important prey type, followed by cephalopods. Results of this study will be used in future ecosystem modeling and stock assessments for this species. Waking into account the history of targeted fisheries for the species on the U.S. east coast and in British Columbia and Washington, as well as the susceptibility of the species to overfishing, fishery managers will need to take a cautious approach should a target fishery develop in the Gulf of Alaska"--Leaves iii-iv.
Download or read book ESSENTIAL FISH HABITAT SOURCE DOCUMENT SPINY DOGFISH SQUALUS ACANTHIAS LIFE HISTORY AND HABITAT NOAA TECHNICAL MEMORANDUM NMFS NE 150 written by United States. National Oceanic and Atmospheric Administration and published by . This book was released on 2000* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Incorporating Migration and Local Movement Patterns Into Management Strategies for Spiny Dogfish squalus Acanthias written by Jennifer L. Cudney and published by . This book was released on 2015 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall purpose of this dissertation is to increase understanding of migration and movement behaviors associated with a highly migratory elasmobranch species. In particular, I seek to determine whether sufficient evidence exists to warrant the separation of the northwest Atlantic Spiny Dogfish (Squalus acanthias) into separate management units. These management units are not genetically distinct, but rather would be based on unique behaviors adopted by hypothesized groups of dogfish that connect reproductive, feeding, and overwintering grounds ("contingents"). This dissertation includes an introductory chapter that introduces the reader to the Spiny Dogfish resource and recent management actions undertaken, followed by a chapter that provides technical and design recommendations based on a meta-analysis and a case study, which address the challenges of conducting behavioral research in dynamic environments through the use of acoustic telemtry. Approximately 30 percent of papers reviewed had no details on design specifications. Meta-analyses suggest that more fish were redetected when more acoustic equipment was deployed for longer periods of time, exemplifying the need for robust equipment that can withstand the rigors of an offshore, dynamic environment. In particular, we found that a heavy anchor, a subsurface float holding a mooring line, and a highflier-float system produced the best results in our case study. New behavioral information, derived from an analysis of data collected through a long-term conventional mark-recapture program and a multi-year acoustic tagging program, suggest that spiny dogfish tagged off North Carolina in overwintering grounds routinely make seasonal migrations to summer feeding habitats off southern New England (specifically, Massachusetts), but do not necessarily follow the same pathway each year. Sharks were often not detected on acoustic receivers for lengthy periods of time, and mark-recapture data indicated extremely lengthy times at liberty (1,000+ days). Spiny Dogfish were also noted to be locally abundant but exhibit short residency times on the Hatteras Bight acoustic array. An evaluation of potential environmental drivers of localized behavior in the southern extent of the Spiny Dogfish range noted that certain factors (i.e., water temperature and weather) had an effect on the presence and absence of dogfish in the Hatteras Bight. Finally, the dissertation discusses the Spiny Dogfish Contingent Hypothesis, which suggests that the northwestern Atlantic stock could comprise as many as five behaviorally distinct groups of Spiny Dogfish. The work presented in this dissertation identifies predictable behavioral patterns undertaken by individual Spiny Dogfish and inferred from recapture data, which can be used in context with future studies to further evaluate and refine the Spiny Dogfish Contingent Hypothesis. Despite many examples in the literature where Contingent Theory has been applied to describe spatially complex behavior in fish stocks, it is rarely applied in management plans. The current management structure in place for Spiny Dogfish is complex, has evolved to respond to fishery needs over the past 16 years, and involves multiple state and federal agencies, councils and commissions. Future research would likely need to quantify contingent "vital rates" and/or contribution to overall spawning stock biomass or fisheries to fully justify the development of a new management framework.
Download or read book Shark Biology and Conservation written by Daniel C. Abel and published by Johns Hopkins University Press. This book was released on 2020-09-01 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enhanced by hundreds of original color photographs and beautifully detailed line drawings, Shark Biology and Conservation will appeal to anyone who is spellbound by this wondrous, ecologically important, and threatened group, including marine biologists, wildlife educators, students, and shark enthusiasts.
Download or read book On a Globulin from the Egg Yolk of the Spiny Dogfish Squalus Acanthias L written by Carl Alsberg and published by . This book was released on 1908 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book COSEWIC Assessment and Status Report on the Spiny Dogfish Squalus Acanthias Atlantic Population in Canada written by Committee on the Status of Endangered Wildlife in Canada and published by . This book was released on 2010 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Mechanical Properties of Raw Flesh and Skin of Spiny Dogfish Squalus Acanthias written by Juan Adalberto Menjivar and published by . This book was released on 1979 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Fisheries Commission for the Mediterranean Report of the forty fifth session written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2023-06-09 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the discussions held during the forty-fifth session of the General Fisheries Commission for the Mediterranean and twelfth session of the Committee on Administration and Finance. During the session, progress in activities related to fisheries, aquaculture, compliance and other strategic activities was reviewed. The Commission adopted 17 binding recommendations and four resolutions related to fisheries management and conservation, aquaculture and compliance. Moreover, the Commission adopted the revised GFCM Rules of Procedure and approved the proposal for the appointment of the new GFCM Executive Secretary. Finally, the Commission adopted its programme of work for the next intersession and approved its autonomous budget for 2023, 2024 and 2025, as well as a number of strategic actions to be funded through extrabudgetary resources. The Commission also endorsed the new Bureau of the Committee on Administration and Finance and extended the mandate of the Bureau of the Scientific Advisory Committee on Aquaculture until 2024.
Download or read book Spiny Dogfish Fishery Management Plan written by and published by . This book was released on 1999 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Purification and Properties of NADP dependent Isocitrate Dehydrogenase from Squalus Acanthias spiny Dogfish Shark written by Kristine Margaret Saxrud and published by . This book was released on 1995 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Report written by U.S. Fish and Wildlife Service and published by . This book was released on 1964 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Report written by and published by . This book was released on 1961 with total page 1358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sharks and Their Relatives written by Merry Camhi and published by IUCN. This book was released on 1998 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sharks and their relatives, the rays and chimaeras, are the diverse group of cartilaginous fishes that have evolved over 400 million years. Historically considered of low economic value to large-scale fisheries, today many of these fishes have become the target of directed commercial and recreational fisheries around the world, and they are increasingly taken in the by-catch of fisheries targeting other species. This report emphasizes the widely-acknowledged need to improve shark fishery monitoring, expand biological research and take management action. It serves as an introduction to the ecology, status and conservation of the sharks and their relatives for a general audience. Shark fisheries can only be managed sustainably, and shark populations remain viable, with the introduction of new conservation and management initiatives.
Download or read book Guide for the Dissection of the Dogfish Squalus Acanthias written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
