Acoustic analysis of volume variation in a bag-net within a set-net

• Published in: Fisheries research 2006-09, Vol.80 (2), p.263-269
• Main Authors: Tae, Jong-Wan, Shin, Hyeon-Ok
• Format: Article
• Language: English
• Subjects: Animal, plant and microbial ecology; Applied ecology; Bag-net; Biological and medical sciences; Current speed; Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.); Fundamental and applied biological sciences. Psychology; Marine; Underwater-positioning system; Volume variation
• ISSN: 0165-7836; 1872-6763
• DOI: 10.1016/j.fishres.2006.03.030

An experiment designed to measure the volume variation of a bag-net within a set-net was conducted in Jaran Bay, Kosung, Korea. Three radio-acoustic-linked positioning (RAP) buoys, a time controller with a personal computer and seven pingers were used to measure the volumes of the bags. During the April neap tide, the minimum and maximum volumes of the bag-net were 4173 m 3 (at 17.00 h) and 4757 m 3 (12.00 h), respectively. The average current directions and speeds were 99.9°, 12.9 cm/s and 104.0°, 2.4 cm/s, respectively. During the spring tide, the minimum and maximum volumes of the bag-net were 2016 m 3 (18.30 h) and 4454 m 3 (15.00 h), respectively. The average current directions and speeds were 315.6°, 16.1 cm/s and 289.0°, 5.7 cm/s, respectively. The minimum (2016 m 3) and maximum (5568 m 3) volumes of the bag-net were observed during the period when the spring tide changed to the neap tide.