Annual trends in catchability and fish stock assessments
نویسندگان
چکیده
منابع مشابه
BUGS in Bayesian Stock Assessments
This paper illustrates the ease with which Bayesian nonlinear state-space models can now be used for practical sheries stock assessment. Sampling from the joint posterior density is accomplished using Gibbs sampling via BUGS, a freely available software package. By taking advantage of the model representation as a directed acyclic graph, BUGS automates the hitherto tedious calculation of the fu...
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There are differences in perception of the status of fisheries around the world that may partly stem from how data on trends in catches over time have been used. On the basis of catch trends, it has been suggested that about 70% of all stocks are overexploited due to unsustainable harvesting and 30% of all stocks have collapsed to <10% of unfished levels. Catch trends also suggest that over tim...
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San Francisco Bay is contaminated by mercury (Hg) due to historic and ongoing sources, and has elevated Hg concentrations throughout the aquatic food web. We monitored Hg in forage fish to indicate seasonal and interannual variations and trends. Interannual variation and long-term trends were determined by monitoring Hg bioaccumulation during September-November, for topsmelt (Atherinops affinis...
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ژورنال
عنوان ژورنال: Scientia Marina
سال: 2003
ISSN: 1886-8134,0214-8358
DOI: 10.3989/scimar.2003.67s163