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| Citation: | Li Ya'nan, Chen Xinjun. Spatial-temporal variation on skipjack resources and its relationship with ENSO for purse seine fishery in the Indian Ocean[J]. Haiyang Xuebao, 2017, 39(4): 72-78. doi: 10.3969/j.issn.0253-4193.2017.04.007
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Skipjack is one of the important tuna species in the Indian Ocean, and the relationship between resource abundance and marine environment is very close. In this paper, according to the production statistics of skipjack for tuna purse seine in the Indian Ocean during 1980 to 2010, marine environmental factors and El Niño Southern Oscillation (ENSO) index, the spatial distribution skipjack resources for tuna purse seine fishery in the Indian Ocean, and its relationship with marine environmental factors were analyzed during El Niño and La Niña years. The results showed that the increasing trend of catches from 1980 to 2010 for skipjack purse seine in the Indian Ocean was remained, but the value of CPUE varied greatly, the lowest is only 0.68 t/d (1997), the highest reached 1.58 t/d (2002). At the same time, the skipjack resource abundance (CPUE) and Niño3.4 index had significant negative correlation, that is during El Niño years, the CPUE decreased, while during La Niña years, CPUE increased. ENSO phenomenon also greatly affected fishing ground distribution of skipjack. During El Niño occurence, the center of gravity for skipjack fishing ground moves eastward and northward, while during La Niña years the center of gravity for skipjack fishing ground moves westward and southward.
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