海面高度偏差図を使ったマグロ漁場探索への基礎的研究

概要

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To predict the region of high tuna abundance in a fishing ground, fishermen recently use near to real-time maps of the sea surface height anomaly (SSHA) field provided by altimeter satellites. These can be found on the Internet by general users as a service from some research institutes around the world. In order to establish the prediction method of tuna abundant regions with the SSHA map, we investigated temperature and salinity distributions by T/V Kagoshima-maru across a warm eddy deduced from the satellite altimetry SSHA map in the East Indian Ocean in August 2003. Hydrographic observations showed two types of water masses : the Australasian Mediterranean Water (AAMW), which occupied the upper layer of the entire warm eddy, and the Indian Central Water (ICW), which was located just south of the warm eddy. A front between the two water masses corresponded to the southern edge of the satellite-deduced warm eddy. This suggests that the satellite altimetry SSHA map is effective for predicting a water mass front, which has the potential of aggregating mechanisms for plankton, and therefore also for large predators such as tuna.
鹿児島大学の論文
2004-12-24