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 Updated Life History and Population Structure Assessment of Spiny Dogfish Squalus Acanthias in the Gulf of Maine written by Walter Bubley and published by . This book was released on 2010 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biology of Sharks and Their Relatives Second Edition written by Jeffrey C. Carrier and published by CRC Press. This book was released on 2012-04-09 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Virtually every area of research associated with sharks and their relatives has been strongly impacted by the revolutionary growth in technology. The questions we can now ask are very different than those reported even two decades ago. Modern immunological and genetic techniques, satellite telemetry and archival tagging, modern phylogenetic analysis, GIS, and bomb dating, are just a few of the techniques and procedures that have become a part of our investigative lexicon. A modern synthesis of the biology of Chondrichthyans, Biology of Sharks and Their Relatives, Second Edition discusses significant advances in the development and application of new molecular techniques to the understanding of the phylogenetic relationships among and between these groups. The book considers the effect of global changes on the status of sharks and their relatives, and how advances in technology and analytical techniques have changed not only how we approach problem solving and scientific investigations, but how we formulate questions. The book also introduces applications of new and novel laboratory devices, techniques, and field instruments. This second edition of the award winning and groundbreaking original exploration of the fundamental elements of the taxonomy, systematics, physiology, and ecology of sharks, skates, rays, and chimera, presents cohesive and integrated coverage of key topics and discusses technological advances used in modern shark research. Offering a well-rounded picture for students and researchers, and far above competitors in scope and research, this new volume holds a wealth of data on the current status of Chondrichthyan research and provides the basis and springboard for original research. Cover photo by Justin Gilligan

Download or read book The Spiny Dogfish Squalus Acanthias in the Northeastern Pacific written by Dayton L. Alverson and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Life history of the Spiny Dogfish squalus Acanthias written by Wilfred Templeman and published by St. John's, Nfld. : Department of Natural Resources. This book was released on 1944 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Fisheries Review written by and published by . This book was released on 2015 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Spiny Dogfish Squalus Acanthias in the Northeast Pacific and a History of Its Utilization written by K. S. Ketchen and published by Fisheries and Oceans, Scientific Information and Publications Branch. This book was released on 1986-01-01 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2013 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History and Management of Spiny Dogfish Squalus Acanthias Off the Northeastern United States written by Marta F. Nammack and published by . This book was released on 1982 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Distribution and Life History of the Spiny Dogfish Squalus Acanthias Off the Oregon and Washington Coasts written by Jaclyn M. Richards and published by . This book was released on 2004 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History Characteristics of the Spiny Dogfish Squalus Acanthias of North Carolina written by Lisa Nicole Litwak and published by . This book was released on 2016 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Variation in the Trophic Position of Spiny Dogfish Squalus Acanthias in the Northeastern Pacific Ocean written by Alexander G. Andrews (III.) and published by . This book was released on 2010 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Spiny dogfish (Squalus acanthias) are among the most abundant shark species in the Gulf of Alaska (GOA). An increase in relative biomass of spiny dogfish in 2003 and 2007 inspired interest in this species as a commercial resource. However, very little was known about the ecology of this species in the GOA. This study investigated the trophic role of spiny dogfish in the GOA, British Columbia (BC), and Washington using stable isotope analysis of carbon and nitrogen. Specifically, we examined the trophic position (TP) of spiny dogfish in relation to length, sex, and geographic region. Weathervane scallops (Patinopecten caurinus) were used as a stable isotopic baseline organism. Spiny dogfish between 52 to 113 cm length had [delta]15N values that ranged geographically from 10.8°/00 to 15.6°/00; [delta]15N was linearly related to length. In contrast, lipid-normalized [delta]13C, values ranged from -21.28°/00 to -16.88°/00 and were not linearly related to length. In the GOA, TP of spiny dogfish ranged from 3.3 to over 4.1, with Kodiak having the highest TPs for spiny dogfish of a given length. Our results indicated that size-based ontogenetic changes in TP of spiny dogfish are important and should be incorporated into mass-balance, food-web models such as Ecopath"--Leaf iii.

Download or read book Northeast Pacific Shark Biology Research and Conservation Part A written by and published by Academic Press. This book was released on 2017-09-04 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Northeast Pacific Shark Biology, Research and Conservation, Part A, Volume 77 highlights the biological attributes of, and the conservation efforts targeted at, populations of vulnerable sharks in the Northeastern Pacific Ocean bordering the west coast of the United States, one of the most economically and ecologically important oceanic regions in the world. Updates in this new volume include chapters on Biodiversity, Conservation and Life History of Northeastern Pacific Chondrichthyans, a Review of current genetic analyses of Northeast Pacific sharks and conservation implications, and a section on the Trophodynamics and ecological impacts of eastern North Pacific sharks. Brings together subject experts on all aspects of shark biology, ecology, fishery management and conservation Summarizes current knowledge Focuses scientific attention on key issues embedded in the concept of shark conservation, both from a species and an ecosystem perspective

Download or read book Essential Fish Habitat Source Document written by Donald G. McMillan and published by . This book was released on 1999 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Freshwater Research written by and published by . This book was released on 2011 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Northeast Pacific Shark Biology Research and Conservation Part B written by and published by Academic Press. This book was released on 2017-10-24 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Northeast Pacific Shark Biology, Research and Conservation, Part B, Volume 78, the latest release in the Advances in Marine Biology series contains updated chapters that focus on a variety of topics, including, but not limited to, an Introduction to Northeast Pacific shark biology, ecology, and conservation, Shark Interactions with Directed and Incidental Fisheries in the Northeast Pacific Ocean: historic and current encounters and challenges for shark conservation, An Introduction to modeling abundance and demographic parameters in shark populations, and Sharks in Captivity: The Role of Husbandry, Breeding, Education and Citizen Science in Shark Conservation. Specialty areas in this longstanding series include marine science, both applied and basic, a wide range of topical areas from all areas of marine ecology, oceanography, fisheries management and molecular biology, and the full range of geographic areas from polar seas, to tropical coral reefs are included making this an ideal reference and resource for postgraduates and researchers in a variety of fields. Reviews articles on the latest advances in marine biology Authored by leading figures in their respective fields of study Presents materials that are widely used by managers, students, and academic professionals in the marine sciences Provides value to anyone studying bottlenose dolphins, deep-sea macrofauna, marine invertebrates, pinna nobilis and ecology, amongst other study areas

Download or read book Population Dynamics of Spiny Dogfish Squalus Acanthias in the NW Atlantic written by Helder Guerreiro Marques da Silva and published by . This book was released on 1993 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: