@article{oai:oacis.repo.nii.ac.jp:00001974,
 author = {Hasegawa, Kohei and Miyamoto, Yoshinori and Uchida, Keiichi},
 issue = {2},
 journal = {Fisheries Science},
 month = {Jan},
 note = {A system for real-time monitoring the depth of small fishing gear was developed using acoustic telemetry to improve the efficiency of fishing operations. The system consisted of an acoustic transmitter (pinger), an omni-directional hydrophone with a depressor, and a receiver. Using a pinger equipped with a depth sensor, a fisherman can confirm whether the fishing gear is at the intended depth. The battery of the developed pinger can be replaced easily for repeated use. The performance of the system was evaluated in a field experiment. The accuracy of measured depth was 0.4 m and was constant even if the pinger was moving. In the experiment, the system could successfully monitor the pinger depth every several second. The system was implemented in hairtail trolling to examine its effectiveness. The implementation experiments revealed some issues with the system, such as the effect of signal reflections or the installation method of the hydrophone. However, the system could monitor the depth of the fishing gear continuously in real time and it operated successfully without any problem during the fishing operation. Application of the developed system is expected to aid fishermen in adjusting the gear depth easily and accurately.
小型漁具を対象とした，漁具深度をリアルタイムで測定・表示するシステムの開発を行った。開発したシステムの性能試験として，測定深度の精度評価とタチウオ漕釣り漁具への実装実験を行った。本システムの測定深度の精度は 0.4 m であった。実装実験では，漁具深度を連続的に測定・表示することにより，漁具深度の調整を支援することができた。本システムにより，効率的な漁具の操作が可能になる。},
 pages = {213--223},
 title = {Development of a real-time depth monitoring system for small fishing gear using an acoustic telemetry technique},
 volume = {82},
 year = {2016}
}