写真及び音響的技法による魚の音響反射強度計測〔英文〕

概要

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An echo sounder system attached to an underwater stereo camera system was used to obtain optical and acoustical information on fish. From the photographic data, the species, size, aspect and bearing angles of fish, and the distance between the fish and the transducer were obtained. The effect of transducer directivity was removed from the echo signal by using the bearing angle which is taken to be the same as the directional angle of the fish relative to the acoustical axis. The target strength of the fish was determined from the acoustic data after removal of the effect of aspect angle on the echo signal. Thus, the relationship between the target strength of the fish and its size could be obtained.These results are thought useful not only for the measurement of the target strength of free-swimming fish, but also for the estimation of fish abundance.
社団法人日本水産学会の論文