Distribution, Population Dynamics and Stock Assessment for the Atlantic Sea Scallop (Placopecten Magellanicus) in the Northeast US PDF Download
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Author: Samuel B. Truesdell
Publisher:
ISBN:
Category : Placopecten magellanicus
Languages : en
Pages : 326
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Book Description
Author: Samuel B. Truesdell
Publisher:
ISBN:
Category : Placopecten magellanicus
Languages : en
Pages : 326
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Book Description
Author: D. R. Hart
Publisher: DIANE Publishing
ISBN: 1428996680
Category : Biology
Languages : en
Pages : 30
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Book Description
Author: Richard Mallory Jr.
Publisher:
ISBN:
Category : Dredging (Fisheries)
Languages : en
Pages : 134
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Book Description
The northwestern Atlantic sea scallop population supports highly valuable fisheries in the United States and Canada. With the common interest of ensuring the sustainability of the sea scallop resource, significant effort has been focused on fishery research and monitoring. Two types of fishery-independent surveys are used to observe Atlantic sea scallop distributions. These surveys employ optical and dredge methods, which serve as input into scallop stock and habitat assessment. However, a criticism of optical survey methods is the lack of physical samples, leading to questions regarding the accuracy of shell height measurements, abundance estimates and sediment classification. To address these specific issues, we utilized video survey research trips, which concurrently deployed survey dredges in areas of Canadian and U.S. waters. Selectivity curves generated using Millar's SELECT model indicated the size selectivity of optical and dredge methods was relatively consistent for scallops 40 mm shell height and larger during sampling in Canadian waters; however sampling in U.S. waters revealed a low selectivity for juvenile scallops (
Author: Clyde L. MacKenzie
Publisher:
ISBN:
Category : Placopecten magellanicus
Languages : en
Pages : 48
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Book Description
Author:
Publisher:
ISBN:
Category : Shellfish
Languages : en
Pages : 476
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 378
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Book Description
Author: Charles Grant Law
Publisher:
ISBN:
Category : Patinopecten
Languages : en
Pages : 120
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Book Description
This project focuses on the population dynamics of sea scallops in the Middle Atlantic Bight and Georges Bank/Southern New England regions. Most sea scallop biomass now occurs within the confines of large federally mandated closed areas and the fishery has moved toward a rotational harvesting strategy. With this dissertation we develop a biophysical model that enables the role of physical variability in this system, and how it interacts with life history processes to shape local and global population dynamics for sea scallops. The modeling effort will link hind-cast circulation simulations, an individual- based model for larval drift and an adult, size-structured, spatial population model. The results of these modeling efforts are compiled and interpreted in such a way as to be useful to managers of the sea scallop fishery. The final goal is to provide information about the impacts of environmental factors on sea scallop population dynamics so that the fishery can be managed proactively instead of reactively. Understanding the connections between sea scallop sub-populations, and how they vary from year to year, should be valuable in assessing the impacts of various real-world management strategies. The thesis is organized in four chapters: the first is an introduction, the second develops the dispersal kernels, the third integrates them into a metapopulation model, and the fourth describes the entire project in a style appropriate for a technical magazine.
Author: Jason S. Link
Publisher: Oxford University Press
ISBN: 019284346X
Category : Nature
Languages : en
Pages : 713
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Book Description
"By examining a suite of over 90 indicators for nine major U.S. fishery ecosystem jurisdictions, Link and Marshak systematically track the progress the U.S. has made toward advancing ecosystem-based fisheries management (EBFM) and making it an operational reality. Covering a range of socioeconomic, governance, environmental forcing, major pressures, systems ecology, and fisheries criteria, they evaluate progress toward EBFM in the U.S., covering a wide range of longitude, latitude, and parts of major ocean basins, representing over 10% of the world’s ocean surface area. They view progress toward the implementation of EBFM as synonymous with improved management of living marine resources in general, and highlight lessons learned from a national perspective. Although US-centric, the lessons learned are applicable for all parts of the global ocean. Though much work remains, significant progress has been made to better address many of the challenges facing the sustainable management of our living marine resources"--Publisher's description.
Author: Sandra E. Shumway
Publisher: Elsevier
ISBN: 0444627197
Category : Technology & Engineering
Languages : en
Pages : 1216
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Book Description
Scallops: Biology, Ecology, Aquaculture and Fisheries, Third Edition, continues its history as the definitive resource on scallops, covering all facets of scallop biology, including anatomy, taxonomy, physiology, ecology, larval biology, and neurobiology. More than thirty extensive chapters explore both fisheries and aquaculture for all species of scallops in all countries where they are fished or cultured. This treatise has been updated to include the most recent advances in research and the newest developments within the industry. As aquaculture remains one of the fastest-growing animal food-producing sectors, this reference becomes even more vital. It has all the available information on scallops needed to equip researchers to deal with the unique global issues in the field. - Offers 30 detailed chapters on the development and ecology of scallops - Provides chapters on various cultures of scallops in China, Japan, Scandinavia, Europe, Eastern North America, and Western North America - Includes details of scallop reproduction, nervous system, and behavior, genetics, diseases, parasites, and much more - Completely updated edition with valuable information on one of the most widely distributed shellfish in the world
Author: Megan M. Levesque
Publisher:
ISBN:
Category : Placopecten magellanicus
Languages : en
Pages : 142
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Book Description
The sea scallop (Placopecten magellanicus) fishery is the most valuable wild scallop fishery in the world. Landings are primarily' adductor muscles, which are ideally creamy white and firm. Recently, significant numbers of dark brown to gray, flaccid and stringy-meats, caused by an apicomplexan, have been caught in areas of Georges Bank and the mid-Atlantic, and are a concern for the industry and management. To investigate the impacts of this disease, a technique to isolate gray from white meat scallops using anesthesia was developed. A four-month laboratory study was conducted comparing mortality rates and shell height-meat weight ratios of healthy and diseased scallops. The density of parasites with decreased meat quality was quantified using histological analysis, and GIMP (GNU Image Manipulation Program) software.Furthermore, age and frequency of infestation by boring sponge (Cliona vastifica) and boring worm (Polydora sp.) were examined with their association to meat quality. Significantly higher mortality in gray-meat scallops compared to white-meat scallops correlated with an increase in the number of parasite nuclei and boring intensity. Additionally, smaller meat weights and extensive myodegeneration were observed with higher levels of infection. Based on these findings, it is important to consider diseased scallops in formulating applied harvestable biomass estimates and in future management strategies. Three general shell height-meat weight relationships are used in the stock assessment for sea scallops; however, a change in this relationship represents a change in biomass estimates. Gray-meat indicates imminent mortality, which also changes the estimate of natural mortality used in stock assessments. The frequency of diseased individuals affects the effort/day as well as the estimate of landings/day used to distribute allocations in the fishery. Understanding the impacts of this disease and how to manage the fishery in its presence is important for the future of the fishery.
