SUMMARY
Species composition, CPUE (catch number per 1000 hooks) of sharks and length frequency of dominant shark species caught in the Atlantic Ocean are discussed using Japanese tuna longline fisheries from 1995 to 2003. Seventeen (17) species of sharks consisting of 14599 individuals were observed through...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.683 http://www.iccat.int/documents/cvsp/cv058_2005/no_3/cv058031106.pdf |
| Summary: | Species composition, CPUE (catch number per 1000 hooks) of sharks and length frequency of dominant shark species caught in the Atlantic Ocean are discussed using Japanese tuna longline fisheries from 1995 to 2003. Seventeen (17) species of sharks consisting of 14599 individuals were observed throughout the Atlantic Ocean during this period. The most abundant species was blue shark throughout all areas, especially in the area of 40-60°N, where the proportion ob blue shark to total shark was over 90%. Shortfin mako shark was seen 30-50°N but the proportion was 12 % at highest. Bigeye thresher and tiger shark were abundant in the areas near the equator with deep set and coastal region of 30-40°N, respectively. The porbeagle was frequently observed in the cold northern area of 50°N. The highest CPUE of blue shark was observed around the area of 30-50°N and that of shortfin mako shark showed similar trend. The CPUEs of bigeye thresher, tiger shark and porbeagle were high in the area near the equator, coastal region and offshore area around 40°N, respectively. From length distribution of blue shark, it was indicated that the area of 30-40°N was used as nursery grounds and they showed different distribution by sex and growth stage. Though the distribution before maturity differed by sex, they moved southward as they matured. The length frequency of shortfin mako shark |
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