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김문관,정상희양 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-
The moving behaviour of fish schools in the bag-net of a large scale set-net was investigated using scanning sonar. This was done in the Kishihata set-net fishing ground, which is located in Nanao city Ishigawa prefecture in Japan. from Nov. 18. 1992 to Dec. 4. 1992. The results obtained are summarized as follows: 1. Moving behaviour of fish schools between two bag-nets can be divided into two groups. The first group includes Frigate mackerel. Yellowtail and Jack mackerel. while the second group consists of Tunas. The Tunas often did move. however the first group rarely moved. The result suggests that fish school movements depend on the type of fish. 2. As for two bag-nets. Frigate mackerel. Yellowtail and Jack mackerel, tended to appear in the afternoon. however Tunas appeared in the daytime. Therefore, the appearance of fish schools depend on the type. 3. The peak speed of Frigate mackerel. Yellowtail and Jack mackerel was 90cm/sec at the first bag-net. 60cm/sec at the second bag-net, but through the second slope-net they moved at 120cm/sec. Therefore. the fish schools that move through the second slope-net move faster than those that move at the first bag-net. and the second bag-net. The result suggests that the second slope-net can be a factor which affects fish schools.
김문관,안장영 제주대학교 해양연구소 1998 해양자원연구소연구보고 Vol.22 No.-
Diurnal migration of fish schools in the set-net fishing ground was investigated by telesounder and underwater video camera in relation to the catching function of the set-net. The investigation took place in the Hamdok set-net fishing ground located in the coast of Cheju Island, from July 25 to August 7 . 1995. The obtained results are summarized as follows: 1. The rate of entering and leaving the set-net was 30%. among the fish schools approaching the set-net area. 2. The greatest number of fish schools were observed between 12:00 and 18:00, after which the schools suddenly disappeared. 3. The swimming speed of horse mackerel and mackerel were 10~40cm/sec dominant speeds were 25~35cm/sec(58%) and 15~25cm/sec(78%) respectively.
정치망의 양망과정에 있어서 멸치어군의 행동에 관한 연구
김문관,정상희양,박정식 제주대학교 해양연구소 1996 해양자원연구소연구보고 Vol.20 No.-
The moving behaviour of anchovy schools (There were small schools of sardine and round-herring in these anchovy schools) in the hauling process of a large scale set-net was investigated using a scanning sonar. in the Kishihata set-net fishing ground located in Nanao city Ishigawa prefecture , Japan from Dec 1st to Dec 4th. 1992. The moving behaviour of anchovy schools in the hauling process a large scale set-net made the term of moving narrowed from the front of the first funnel-net to the second funnel-net as the hauling proceeded. We found that when the ship of picking up the net approched to the second funnel-net, the anchovy school entered in the second bag-net fast hard. The moving speed before hauling and during the hauling process was most of 50cm/sec and below and there was no difference in the moving speed.