New Trawling System Equipped in NANSEI MARU of Kagoshima University

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  • 鹿児島大学南星丸に装備した新しいトロールシステム
  • カゴシマ ダイガク ナンセイマル ニ ソウビ シタ アタラシイ トロール システム

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Description

The trawling system equipped in the NANSEI MARU is composed of two parts. One displays positions of the ship and the fish school. The other controls fishing gear. This system was applied for the purpose of evaluating the length distribution of the fish school, and monitoring the position and the configuration of fishing gear. Its goals are optimizing the fishing gear configuration during towing and confirming a capture of fish school. This system was installed in the newly constructed training ship NANSEI MARU(175 G.T, 1323 kw) in Faculty of Fisheries, Kagoshima University. This system consists of scanning sonar, quantitative echo sounder, trawl sonar, and automatic tension controlled trawl winches system. The automatic tension controlled trawl winches system controls the length of warp for optimizing the configuration of fishing gear to its optimum condition. The fish schools and the fishing gear are searched with the scanning sonar. The trawl sonar measures the depth, the horizontal and vertical spread of the trawl net. The relative positions of a trawl gear and depths of otter boards are indicated on the scanning sonar screen by the signal from the transponders, which are located at the otter boards. The data on the fish schools and the fishing gear, such as relative direction, the depth and the distance, are sent to the computer. The computer system integrates these data and shows information on the positions of the fish school and the fishing gear on the display screen. It can also display a three-dimensional image on the screen from various viewpoints. The skipper can direct the trawl gear towards the fish school by manipulating the warp length and the towing speed while watching monitor screen. This trawling system showed satisfactory performance during the field experiment.

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