977 resultados para Ficción actual
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This report presents an analysis of existing information on fisheries of shad and shrimp. It explains the use of Schaefer model and based on this and other available information, the author suggests the measures to be implemented for a better management of these resources.
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A summary of the shrimp fishery history as well as the most important recommendations for the period 1977-1990 is presented. During the last years the catch rates have decreased. Although many possible causes can be appointed, such as, weather conditions and increase of effort, there is no clear explanation for it. A relationship between catch rates in the main period of recruitment (January to March) and the level of recruitment of the same year was established. Based on this relationship, the total annual catch is predicted for the level of fishing mortality chosen. Fishing mortality is estimated as 2.28 yearˉ¹ and a gradual reduction of fishing effort is recommended until 2.17 yearˉ¹ calculated as F(sub)0.1.
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30 hojas : ilustraciones, fotografía.
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35 hojas : ilustraciones, fotografías.
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[20] hojas : ilustraciones, fotografías.
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27 hojas : ilustraciones, fotografías.
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[79] hojas : ilustraciones, fotografías.
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17 hojas : ilustraciones, fotografías.
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32 hojas.
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145 hojas : ilustraciones, fotografías a color.