Fisheries models

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  • Understanding and quantitative describing of marine ecosystems requires an integration of physics, chemistry and biology. The coupling between physics, which regulates for example nutrient availability and the physical position of many organisms is particularly important and thus cannot be described by biology alone. Therefore the appropriate basis for theoretical investigations of marine systems are coupled models, which integrate physical, chemical and biological interactions.

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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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  • Tham khảo sách 'managing small scale fisheries alternative directions and methods', 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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  • Tham khảo sách 'fishery and utilisation of mesopelagic fishes and krill in the north atlantic', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tham khảo sách 'general fisheries commission for the mediterranean', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tham khảo sách 'fao yearbook of fishery statistics', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Consequently, the first section of this paper will focus on the concept of conflict and conflict cycles. After presenting a working definition of conflict, a theoretical model of the conflict lifecycle will be provided. This section also presents an extended model of the conflict lifecycle which includes both the conflict intensity level and measures to prevent, limit and resolve the conflict.

    pdf105p tainhacmienphi 25-02-2013 17 4   Download

  • The paper is focusing on the following topics: - Assessment of natural conditions in Diem Dien Town, such as: location, relief, land, water and marine resources. - Research, assess human and economic resources such as population, labor skills, infrastructure, political mechanism and consumption market. - Analysis, assess efficiency of current producing situation and organizing agriculture, fisheries for economic structural transition oriented industrialization and goods commodity. - Set up spatial models of agro - fisheries and processing industry with its natural, social...

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  • Available data suggest that, in addition to the obvious catches of fish for human needs, the by- catches in the world’s fisheries have a significant ecological impact and cause mortality amongst fin-fish (particularly the juveniles of commercial fish species), as well as amongst benthic invertebrates, marine mammals, turtles and birds.

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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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  • The crisis has highlighted the need to improve risk management strategies at both the system-wide and institutional levels in the financial services industry. It has demonstrated that efforts limited to specific institutions or jurisdictions are insufficient to address a problem that is global in scope. New thinking is required to rebuild a damaged financial system.

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  • Contaminants from the industry discharge flows through river. Some are accumulate, interact and settle with the living organism, plant and sediment and finally reach the coastal and ocean. Plants and living organism in the ocean are important food sources for human intake. Contaminants may then enter human food chain and accumulate in fishes, molluscs (octopus, shellfish, and cockle), crustaceans (shrimp, crab, and lobster), seaweed, sea cucumber and etc. Therefore, it is essential to understand the effect to aquatic environment....

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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 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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  • 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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