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Analysis Of Spiny Dogfish Squalus Acanthias Age Size And Growth Off The Coast Of North Carolina On A Temporal Scale
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Book Synopsis Analysis of Spiny Dogfish (Squalus Acanthias) Age, Size, and Growth Off the Coast of North Carolina on a Temporal Scale by : Tiffany Yang
Download or read book Analysis of Spiny Dogfish (Squalus Acanthias) Age, Size, and Growth Off the Coast of North Carolina on a Temporal Scale written by Tiffany Yang and published by . This book was released on 2016 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Life History, Demography, and Ecology of the Spiny Dogfish (Squalus Acanthias) in the Gulf of Alaska by : Cindy Ann Tribuzio
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.
Book Synopsis Food and Feeding Habits of the Spiny Dogfish Squalus Acanthias Overwintering Off the Coast of North Carolina and the Effects on the Marine Community by : Charles W. Bangley
Download or read book Food and Feeding Habits of the Spiny Dogfish Squalus Acanthias Overwintering Off the Coast of North Carolina and the Effects on the Marine Community written by Charles W. Bangley and published by . This book was released on 2011 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spiny dogfish (Squalus acanthias) are small, highly migratory sharks that occur in large numbers in North Carolina nearshore waters between November and March. This species has long been considered a pest by commercial fishermen, and is suspected of being a major source of predation mortality for economically-valuable species. The goals of this thesis research were 1.) to assess the efficiency of a non-lethal method for collecting stomach contents from dogfish, 2.) to determine if ontogeny, sex, and habitat selection influence the dogfish diet, 3.) to identify important prey species for dogfish overwintering off of North Carolina, and 4.) to describe the predatory and competitive interactions between spiny dogfish and another piscivore (striped bass, Moronoe saxatilis) during the overwintering period. To accomplish this, 399 spiny dogfish were captured in North Carolina waters during research bottom trawl surveys in February and March, 2010. Size and sex data were recorded for each dogfish, as well as depth, salinity, and temperature data at each station. Stomach contents were sampled by either dissection or stomach tube gastric lavage, in which an acrylic tube was inserted through the esophagus and flushed with water. Prey items were identified to the lowest possible taxa and quantified in terms of number, weight, and frequency of occurrence, then importance was determined by calculating the Index of Relative Importance for each taxa. Consumption during the sampling period was estimated using estimates of daily ration from previous studies. Stomach tube lavage proved to be efficient, and tube diameters within 10-20 mm of the shark's mouth width were nearly 100% efficient. Spiny dogfish showed significant differences in habitat selection by sex and size: females occupied significantly shallower, less saline, and cooler water than males, and dogfish began utilizing shallower depths between 600-650 mm total length (TL). The dogfish diet also shifted from an invertebrate-based to a teleost fish-based diet between 650-700 mm TL. Atlantic menhaden, (Brevoortia tyrannus) and bay anchovy (Anchoa mitchili) were the most important prey for dogfish sampled in this survey, though menhaden only dominated the diet in February. Dogfish predation may account for 14.08-3.56% of menhaden landings. Spiny dogfish and striped bass showed high spatial and potential dietary overlap, and dogfish consumed the equivalent of less than 0.91% of the striped bass stock biomass. Dogfish and striped bass are potential intraguild predators, but this relationship does not appear to affect the abundance and distribution of either species.
Book Synopsis Life History Characteristics of the Spiny Dogfish (Squalus Acanthias) of North Carolina by : Lisa Nicole Litwak
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:
Book Synopsis The Spiny Dogfish (Squalus Acanthias) in the Northeastern Pacific by : Dayton L. Alverson
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:
Book Synopsis The age, growth, and maturation of the spiny dogfish, Squalus acanthias L., of the northwest Atlantic by : T. P. Slauson
Download or read book The age, growth, and maturation of the spiny dogfish, Squalus acanthias L., of the northwest Atlantic written by T. P. Slauson and published by . This book was released on 1983 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Canada. Fisheries and Marine Service. Research and Development Directorate Publisher :nanaimo, b.c. : pacific biological station, fisheries and marine service ISBN 13 : Total Pages :16 pages Book Rating :4.:/5 (299 download)
Book Synopsis Age and Growth of Spiny Dogfish (squalus Acanthias) in the Strait of Georgia, British Columbia by : Canada. Fisheries and Marine Service. Research and Development Directorate
Download or read book Age and Growth of Spiny Dogfish (squalus Acanthias) in the Strait of Georgia, British Columbia written by Canada. Fisheries and Marine Service. Research and Development Directorate and published by nanaimo, b.c. : pacific biological station, fisheries and marine service. This book was released on 1977 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variation in the Trophic Position of Spiny Dogfish (Squalus Acanthias) in the Northeastern Pacific Ocean by : Alexander G. Andrews (III.)
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.
Author :K. S. Ketchen Publisher :Fisheries and Oceans, Scientific Information and Publications Branch ISBN 13 :9780660120492 Total Pages :78 pages Book Rating :4.1/5 (24 download)
Book Synopsis The Spiny Dogfish (Squalus Acanthias) in the Northeast Pacific and a History of Its Utilization by : K. S. Ketchen
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:
Book Synopsis Analysis of Flow Around Living Spiny Dogfish (squalus Acanthias) Using an Information System by : Yu. N. Varich
Download or read book Analysis of Flow Around Living Spiny Dogfish (squalus Acanthias) Using an Information System written by Yu. N. Varich and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Distribution and Life History of the Spiny Dogfish (Squalus Acanthias) Off the Oregon and Washington Coasts by : Jaclyn M. Richards
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:
Book Synopsis Life History and Management of Spiny Dogfish, Squalus Acanthias, Off the Northeastern United States by : Marta F. Nammack
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:
Book Synopsis Growth, Maturation, and Fecundity of the Spiny Dogfish, Squalus Acanthias, in the Northwestern Atlantic by : Timothy Pierson Slauson
Download or read book Growth, Maturation, and Fecundity of the Spiny Dogfish, Squalus Acanthias, in the Northwestern Atlantic written by Timothy Pierson Slauson and published by . This book was released on 1982 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The International Trade and Fishery Management of Spiny Dogfish (Squalus Acanthias) in Light of CITES List Insertion by : Andrea Dell'Apa
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.
Book Synopsis Population Dynamics of Spiny Dogfish, Squalus Acanthias, in the NW Atlantic by : Helder Guerreiro Marques da Silva
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:
Book Synopsis Population Characteristics of the Spiny Dogfish, Squalus Acanthias Linnaeus, 1758, from Geographically Distinct Locations in Atlantic Canada During the Summer and Fall of 1996 by : Tina Mae Moore
Download or read book Population Characteristics of the Spiny Dogfish, Squalus Acanthias Linnaeus, 1758, from Geographically Distinct Locations in Atlantic Canada During the Summer and Fall of 1996 written by Tina Mae Moore and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A total of 1684 dogfish were sampled to determine population characteristics from three regions in Atlantic Canada: the Minas Basin, the outer Bay of Fundy, and the Gulf of St. Lawrence. The posterior dorsal spine was removed from 211 male and 475 female dogfish for ageing. Ages were determined from the spines and annuli lost to wear were calculated using a spine dimension standardized equation. This study was the first attempt to define a complete reproductive stage assessment of a shark. A total of 475 females had the reproductive tracts removed and categorized as one of six stages. The Minas Basin sample exhibited the highest number of reproductively mature females (56.1%) and female dogfish captured in the outer Bay of Fundy were predominantly immature (97.6%). Maturity for 50% of female dogfish in Atlantic Canada was calculated at 17 years of age and a total length of 83.4 cm. Male dogfish age and total length were similar between the three regions but only 11 male dogfish were taken during the entire season in the Minas Basin (male:female ratio; 1:99). The Minas Basin female dogfish were significantly larger, older, and more mature than females in the other two sampling locations. Few comprehensive studies exist on spiny dogfish in the Northwest Atlantic because it is has only recently been commercially exploited. If commercial exploitation of dogfish were to begin in Atlantic Canada it would be more economically and biologically successful as a bycatch fish with other fisheries.
Author :Wilfred Templeman Publisher :St. John's, Nfld. : Department of Natural Resources ISBN 13 : Total Pages :108 pages Book Rating :4.F/5 ( download)
Book Synopsis The Life-history of the Spiny Dogfish (squalus Acanthias) by : Wilfred Templeman
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:
