Xem 1-20 trên 22 kết quả Fisheries stock
  • Table 1 contains a summary, by species, of the information included in the stock assessments, and also indicates those that have been revised since the 1999 publication. A total of 28 of the 60 Atlantic and Gulf of Mexico stock assessment reports were revised for 2000. Most of the proposed changes incorporate new information into sections on population size and mortality estimates. The revised SARs include 15 strategic and 13 non-strategic stocks.

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  • Policy makers, for example, should feel free to conduct national macroeconomic policies without the fear of influencing capital formation and the stock trade process. Moreover, economic theory suggests that stock prices should reflect expectations about future corporate performance, and corporate profits generally reflect the level of economic activities. If stock prices accurately reflect the underlying fundamentals, then the stock prices should be employed as leading indicators of future economic activities, and not the other way around.

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  • Committed to ensuring the long-term conservation and sustainable use of fishery resources in the South Pacific Ocean and in so doing safeguarding the marine ecosystems in which the resources occur; Recalling relevant international law as reflected in the United Nations Convention on the Law of the Sea of 10 December 1982, the Agreement for the Implementation of the Provisions of the United Nations Convention on the Law of the Sea of 10 December 1982 relating to the Conservation and Management of Straddling Fish Stocks and Highly Migratory Fish Stocks of 4 December 1995 and the Agreement to...

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  • Around the world, many fisheries are shared fisheries in the sense that a common fish stock is accessed by both commercial and non-commercial fishers. Non-commercial fishers can include recreational fishers, or customary fishers, or both. A prevalent problem in these fisheries is competition between commercial and non-commercial fishers for access to a resource that is subject to increasing utilisation pressure.

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  • The fi sheries in Newfoundland and Labrador waters began in the early 1500s, were prosecuted mainly for Atlantic cod (Gadus morhua), and increased markedly, and unsustainably, in the last half of the 20th century. The terms of union of Newfoundland with Canada relinquished full authority for research and management of the marine fi sheries to the Government of Canada in 1949.

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  • This book examines the international law of high seas ®sheries in the light of the negotiations of the Third United Nations Conference on the Law of the Sea, the state and international practice that followed, and its in¯uence on the 1995 Straddling Stocks Agreement.

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  • This work is essentially orientated to present an introduction to the mathematical models applied to fisheries stock assessment. There are several types of courses about the methods used in fish stock assessment. One type considers practical application as the main aspect of the course, including the use of computer programs. The theoretical aspects are referred to and treated as complementary aspects. A second type is mainly concerned with the theoretical aspects of the most used models.

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  • The importance of fisheries in a country cannot only be measured by the contribution to the GDP, but one must also take into consideration that fisheries resources and products are fundamental components of human feeding and employment. Another aspect that makes fisheries resources important is the self renewable character. Unlike mineral resources, if the fishery resources or any other biological resources are well managed, their duration is pratically unlimited.

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  • Tham khảo sách 'stock assessment for fishery management a framework guide to the stock', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Synthesis has both an age-structured and a size/age-structured version. Both are capable of simultaneously examining data from several fisheries and several surveys, each with its own pattern of selectivity. Synthesis calculates selectivity with modified logistic functions. Parameters of these functions can take on time-specific values, thus allowing flexibility to track changes in fishery selectivity. The goodness of fit is quantified in terms of a log-likelihood function composed of independent terms for each kind of observation from each type of fishery or survey.

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  • The stock synthesis model (Methot 1989, 1990) was developed to provide a bridge between biomass-based assessment methods and full age-structured methods (Deriso et al. 1985; Fournier and Archibald 1982). Subsequently, synthesis evolved to a flexible tool (Methot 1990) and was used for many west coast and Alaska groundf ish stock assessments during 1988-2000. Synthesis consists of a forward population projection model that simulates the dynamics of a stock within a statistical estimation framework.

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  • In Portugal, the fisheries contribution to the GDP is less than 1.5 percent. However, with regard to food, the annual consumption value of 60 kg of fish per person, is very high. Only countries like Iceland, Japan and some small insular nations reach a higher value. We still have to consider that of the total amount of protein necessary in our food consumption, 40 percent comes from fisheries. This corresponds to 15 percent of the total amount spent on food by the Portuguese population. From a social point of view, we estimate that there are, at present, 34 000...

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  • Geographic structure is not yet included in the size model. In both configurations, synthesis maintains a full age-structured description of the population and employs conventional equations to describe the population dynamics. A wide hierarchical range of model complexity can be defined for either version (Methot 1998). At one extreme, the model can be used with no age or size data (with external estimation of selectivity and weight-at-age) and the est imation process can be condensed to a few stock-recruitment parameters that mimic stock-reduction analysis (Kimura and Tagart 1982).

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  • The performance of synthesis in a variety of situations has been evaluated through its application to simulated data. Bence et al. (1993) investigated the importance of adult surveys versus recruitment surveys in stabilizing the results of model results. Sampson (1993) explored the importance of providing sufficient flexibility in the specification of fishery selectivity. Methot (1994) showed that the size model was capable of extracting information on population characteristics from size composition data.

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  • In this paper we analyse in more detail the implications of Gabaix’s theory, taking as well an international perspective that looks at four economic areas. However, we do not restrict ourselves to considering big firms. Rather, we analyse the predictive power stemming from a large cross section of firms’equity prices with the key finding that, in a given month, it is only a small subset of these firms that help improve predictability. Overall, the composition of the set of most predictive firms remains stable for around half a year.

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  • The link between Önancial asset prices and macro variables has become a popular Öeld of the economic research over the past decades. Many studies, mostly applied on the United States, have shown that the term spread, measured as the di§erence between yields on longer maturity bonds and money market interest rates, has predicted macro variables more accurately compared with other Önancial asset classes. Results concerning the ability of stock prices, usually in the form of broad-based indices, in predicting such variables have been mixed.

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  • The U.S. findings prompt us to expand our investigation internationally. We use Datastream data to derive results for 24 other countries over the last 30 years, covering essentially all major stock exchanges in the world. We find that the pattern of U.S. results is largely repeated in these other countries. If anything, the results are more pronounced for foreign countries. More specifically, the daily returns around new moon dates are more than double those around full moon dates, with annualized differences on the magnitude of 7 to 10 percent. In addition, combining U.S.

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  • Thông điệp của Chủ tịch Hội đồng Quản trị Tóm lược lịch sử hoạt động Báo cáo của Hội đồng Quản trị Báo cáo của Ban Tổng Giám đốc Tổ chức và nhân sự của Công ty Thông tin về cổ đông Các thông tin khác Báo cáo tài chính và báo cáo của kiểm toán độc lập Tên tổ chức niêm yết: Công ty Cổ phần Xuất Nhập khẩu Thủy sản An Giang Tên giao dịch: Tên viết tắt: Angiang Fisheries Import Export Joint Stock Company AGIFISH Co. Vốn điều lệ: 128.592.880.

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  • for Scottish Aquaculture, 2003). This success story has been accompanied by growing concern over the environmental impact and sustainability of the industry. This has mainly been based around the localised impact upon the production sites, concern over the impact upon wild salmon and sea trout stocks as well as wider ecosystem effects. One of the factors considered in the latter category is the need for considerable volumes of fish meal and fish oil in carnivorous fin fish diets.

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  • WWF-Norway has, during the writing of this report, received great interest both from industry, governments and other NGOs. WWF hopes that addressing this issue will contribute in the long quest for protecting the biodiversity in our oceans. The report looks into the raw materials used for feed in aquaculture, specifically of salmon and trout. It examines the sustainability of the fisheries which are exploited to produce the feed, the added pressure the fish farming industry puts on those stocks, the efficiency of feeding fish to carnivorous fish, and some of the alternatives....

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