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首页> 外文期刊>Fisheries Oceanography >Seasonal and interannual variations of oceanographic conditions off Mangalore coast (Karnataka, India) in the Malabar upwelling system during 1995-2004 and their influences on the pelagic fishery
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Seasonal and interannual variations of oceanographic conditions off Mangalore coast (Karnataka, India) in the Malabar upwelling system during 1995-2004 and their influences on the pelagic fishery

机译：1995-2004年间马拉巴尔上升流系统中芒格洛尔海岸（印度卡纳塔克邦）海洋条件的季节性和年际变化及其对远洋渔业的影响

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摘要

Mangalore coast is well known for its multi-species and multi-gear fisheries and the fishery and oceanographic features of this region is a true representation of the Malabar upwelling system. Ten years of study (1995-2004) of oceanographic parameters has been carried out from the inshore waters off Mangalore to understand their seasonal and interannual variations and influences on the pelagic fishery of the region. Attempt has been also made to understand the influence of local and global environmental conditions on the alternating patterns of abundance between the Indian mackerel and oil sardine from the area. Field- and satellite-derived oceanographic data have shown that coastal upwelling occurs during July-September with a peak in August resulting in high nutrient concentrations and biological productivity along the coast. Nearly 70% of the pelagic fish catch, dominated by oil sardine and mackerel, was obtained during September-December, during or immediately after the upwelling season. Catches of scombroid fishes were significantly related to cold Sea Surface Temperature, while such relationships were not observed for sardines and anchovies. Significant positive correlations were observed between the ENSO events (MEI) and seawater temperature from the study area. The extreme oceanographic events associated with the cold La Nina, which preceded the exceptional 1997-98 El Nino event, were responsible for the collapse of the pelagic fishery, especially the mackerel fishery along the southwest coast of India (Malabar upwelling system). Coinciding with the collapse of the mackerel fishery, oil sardine populations revived during 1999-2000 all along the southwest coast of India. Tolerance of oil sardine to El Nino/La Nina events and the low predatory pressure experienced by their eggs and larvae due to the collapse of mackerel population might have resulted in its population revival.
机译：芒格洛尔海岸以其多物种和多齿轮渔业而闻名，该地区的渔业和海洋学特征是马拉巴尔上升流系统的真实代表。已经从芒格洛尔附近的近海进行了十年的海洋学参数研究（1995年至2004年），以了解其季节性和年际变化以及对该地区中上层渔业的影响。人们还试图了解当地和全球环境条件对该地区印度鲭鱼和沙丁鱼丰度交替变化的影响。野外和卫星得出的海洋数据表明，沿海上升流发生在7月至9月之间，8月达到顶峰，导致沿岸养分浓度和生物生产力较高。在上升季节的9月至12月期间，获得了近70％的上层鱼类捕获物，其中主要是沙丁鱼和鲭鱼油。 com类鱼类的捕获与寒冷的海面温度显着相关，而沙丁鱼和an鱼则没有这种关系。研究区域的ENSO事件（MEI）与海水温度之间存在显着的正相关。与拉尼娜（La Nina）寒冷相关的极端海洋事件，是在1997-98年厄尔尼诺现象之前，是导致中上层渔业特别是印度西南沿海的鲭鱼渔业崩溃的原因（马拉巴尔上升流系统）。伴随着鲭鱼渔业的崩溃，沙丁鱼种群在1999-2000年期间在印度西南海岸全部恢复。沙丁鱼对El Nino / La Nina事件的耐受性以及由于鲭鱼种群的崩溃而使它们的卵和幼虫经历的低掠食压力可能导致其种群恢复。

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