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Effect of beach-seine catching activities on changes of substrate structurein the southern coast of the Caspian Sea(inRudsar and Chaboksar)
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Shahpoor Gholamy   , Maryam Shapoori , Karim Mehdi nejad , ZabihAlla Pajand |
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Abstract: (3577 Views) |
| In this study, the effect of beach-seine catching activitieson changesof sediment structure of bed in Rudsar and Chaboksar areas were investigated. Samplesof sedimentwere takenmonthlywithaVan Veen grabcoveringasurfaceareaof 225 cm2 from seining and non-fishing areasofRudsarandChaboksar stations in depths of 3, 6 and 10 meters with 3 repetitions in each depth, in autumn and winter 2011.The results showa significant difference between the percentage of silt-clayinthe various sampling depths of seining area and the percentage of silt-clay in the various sampling depths of non-fishing area, in each of Rudsar and Chaboksar stations and each of autumn and winter seasons(P< 0.05). So that, the amount of silt-clay in seining area has been more than the amount of silt-clay in non-fishing area. In the Rudsar station, the amount of Total Organic Matter of the seining area were 2.6 and 2.2percent in autumn and winter, respectively, and these amounts for non-fishing area were 2.3 percent in autumn and 1.7percent in winter.Also in the Chaboksar station, the amount of Total Organic Matter of the seining area were 2.5 and 2.2 percent in autumn and winter, respectively, and these amounts for non-fishing area were1.5 percent in autumn and 1.3 percent in winter. Results indicateda significant difference between the amounts of Total Organic Matter in seining and non-fishing areas(P< 0.05). Also, the amount of Organic Matter has significant and positive correlation with the percentage of silt-clay. The results of this study show the sedimenttexture of seining areasin the various sampling depths are different form non-fishing areas. |
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| Keywords: Beach-seine, Grain size, Bed, RudsarandChaboksar, Caspian Sea. |
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Full-Text [PDF 126 kb]
(1370 Downloads)
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Type of Study: Research |
Subject:
Fisheries
Received: 2015/02/18 | Accepted: 2015/02/18 | Published: 2015/02/18
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