Analysis of Fish-Finder records―VIII Classification and interpretation of echo trace on the tuna fishing ground

概要

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Recently an echo-sounder for tuna fishing was developed and now it has become possible to record not only fish concentration but also a larger individual fish at a depth of 500 meters. However, in tuna fishing, it has been not yet used so effectively as purse seining and trawling, because of the lack of due knowledge on a part of fishermen of tuna long-line on effective use of the echo-sounder and on interpretation of echogram to obtain useful information for the selection of good fishing ground. The classification and interpretation of echogram will become possible empirically by correlative review of the capture. The present paper is to deal with the typical echogram on the tuna fishing ground and how to distinguish the echo trace of tuna from others.
長崎大学水産学部の論文
1969-12-00