Shell Height-meat Weight Allometry of Georges Bank Scallop (Placopecten Magellanicus) Stocks PDF Download
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Author: Canada. Department of Fisheries and Oceans. Halifax Laboratory. Biological Sciences Branch
Publisher: Halifax, N.S. : Canadian Atlantic Fisheries Scientific Advisory Committee
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
Author: Canada. Department of Fisheries and Oceans. Halifax Laboratory. Biological Sciences Branch
Publisher: Halifax, N.S. : Canadian Atlantic Fisheries Scientific Advisory Committee
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
Author: Christopher L. Sarro
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Book Description
Author: Sandra E. Shumway
Publisher: Elsevier
ISBN: 0080480772
Category : Technology & Engineering
Languages : en
Pages : 1501
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Book Description
Scallops are among the better known shellfish and are widely distributed throughout the world. They are of great economic importance, support both commercial fisheries and mariculture efforts and occupy a unique niche in the marine environment. Contributions from world leaders in scallop research and culture cover all facets of scallop biology including anatomy, taxonomy, physiology, ecology, larval biology and neurobiology. Chapters are also devoted to diseases and parasites, genetics, population dynamics and the adductor muscle, with extensive reference lists provided for each chapter. Since the publication of the first edition of Scallops: Biology, Ecology and Aquaculture in 1991, commercial interest in scallops has grown globally and this is reflected in the seventeen extensive chapters covering both fisheries and aquaculture for all species of scallops in all countries where they are fished or cultured. The Second Edition is the only comprehensive treatise on the biology of scallops and is the definitive reference source for advanced undergraduate and graduate students, mariculturists, managers and researchers. It is a valuable reference for anyone interested in staying abreast of the latest advances in scallops.* Offers over 30 detailed chapters on the developments and ecology of scallops* Provides chapters on various cultures of scallops in China, Japan, Scandinivia, Eastern North American, Europe, and Eastern North America* Includes details of their reproduction, nervous system and behavior, genetics, disease and parasites, and much more* Complete updated version of the first edition
Author: Sandra E. Shumway
Publisher: Elsevier Publishing Company
ISBN:
Category : Science
Languages : en
Pages : 1124
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Book Description
Author: Clyde L. MacKenzie
Publisher:
ISBN:
Category : Placopecten magellanicus
Languages : en
Pages : 48
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Book Description
Author: Bedford Institute of Oceanography
Publisher:
ISBN:
Category : Marine biology
Languages : en
Pages : 464
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Book Description
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.
Author: Han-Lin Lai
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 73
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Book Description
The 1996 Northeast Fisheries Science Center sea scallop survey was conducted during July 29 - August 9 and August 15 - 26 using the RIV ALBATROSS IV. The purpose of the survey was to monitor trends in abundance, population composition, and recruitment of sea scallop (Placopecten magellanicus) resources in the Mid-Atlantic and Georges Bank regions in depths between 28-110 meters (15 to 60 fin). A total of 429 sampling tows were conducted during the 1996 survey. Survey indices of relative abundance (stratified mean number per tow) and biomass (stratified mean meat weight per tow) were calculated for the principal scallop areas within the Mid-Atlantic and USA Georges Bank regions. Indices were derived for: 1) pre-recruits [80 meat count]; 2) recruits or harvestable-sized scallops [70 mm shell height; 80 meat count]; and 3) total scallops [all sizes]. In addition, percentage distributions of the number of scallops within five meat count intervals were calculated for each stratum, area, and region. Meat count refers to the number of scallop meats per pound. Results of the 1996 survey indicate that the indices of relative abundance and biomass in the Mid-Atlantic region decreased substantially from the relatively high levels observed in 1995. In the USA Georges Bank region, the indices of relative abundance and biomass increased substantially from the 1995 value. The most substantial increases of abundance and biomass indices occurred in the Northern Edge and Peak area; however, the indices decreased in the Southeast Part area between 1995 and 1996. . The Mid-Atlantic scallop resource had a high proportion of small scallops in 1996: 17% of the scallops caught were >80 count and 56% were in the 80-40 count category. Of the harvestable biomass
Author: Bradley Paul Harris
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Book Description
Author: Brad Hubley
Publisher:
ISBN:
Category : Scallops
Languages : en
Pages : 43
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Book Description
