Measurement Techniques of Fish in Set Net by Use of the Acoustic Camera

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  • OCHI Yousuke
    National Research Institute of Fisheries Engineering, Fisheries Research and Education Agency
  • YAMASAKI Shintaro
    National Research Institute of Fisheries Engineering, Fisheries Research and Education Agency

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Other Title
  • 音響カメラを用いた定置網内における魚群計測
  • オンキョウ カメラ オ モチイタ テイチアミ ナイ ニ オケル ギョグン ケイソク

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Description

Laboratory experiments and field surveys in a set net were conducted by use of the acoustic camera, DIDSON, as a device to observe behaviours of various fish species without an influence on them. As a result of laboratory experiments, it was shown that a frame rate of images taken by DIDSON peaked out when an observation distance was shorter than 5m, while the resolution of subject improved in proportion to a shortening of an observation distance and a frame rate improved in inverse proportion to it when a distance was longer than 5m. This may cause an image deformation of the moving subject at a shorter observation distance because DIDSON draws it by the interlace scan. As a result of observations in the set net under the optimized setting of DIDSON taking above results into consideration, it was possible to discriminate images of bluefin tuna from other species.

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