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Behavioral analysis of Pacific cod (Gadus macrocephalus) released to the entrance of Jinhae Bay, Korea

진해만 입구에 방류한 대구(Gadus macrocephalus)의 행동 분석

  • SHIN, Hyeon-Ok (Division of Marine Production System Management, Pukyong National University) ;
  • HEO, Gyeom (Department of Fisheries Physics, Graduate School, Pukyong National University) ;
  • HEO, Min-A (Department of Fisheries Physics, Graduate School, Pukyong National University) ;
  • KANG, Kyoungmi (KOICA-PKNU International Graduate Program of Fisheries Science, Pukyong National University)
  • 신현옥 (부경대학교 해양생산시스템관리학부) ;
  • 허겸 (부경대학교 대학원 수산물리학과) ;
  • 허민아 (부경대학교 대학원 수산물리학과) ;
  • 강경미 (부경대학교 KOICA-PKNU국제수산과학협동과정)
  • Received : 2019.02.07
  • Accepted : 2019.02.25
  • Published : 2019.02.28

Abstract

In order to investigate the behavioral characteristics of Pacific cod (Gadus macrocephalus) released at the entrance of Jinhae Bay, Korea, the direction and range of movement, swimming speed of the fish were measured with an acoustic telemetry techniques in winter, 2015. Three wild Pacific codes WC1 to WC3 (total length 66.0, 75.0, 76.0 cm; body weight 2.84, 2.79, 3.47 kg, respectively) were tagged with the acoustic transmitter. WC1 tagged with an acoustic transmitter internally by surgical method, WC2 and WC3, externally with the acoustic data logger and a micro data logger for recording audible sound waves including timer release unit. The movement routes of the tagged fish were measured more than five hours using VR100 receiver and a directional hydrophone. The directionality of the fish movement was tested by Rayleigh's z-Test, the statistical analysis, and a statistical program SPSS. Three tagged fishes were individually released on the sea surface around the entrance to the Jinhae Bay on 10 to 24 January 2015. WC1 moved about 13.32 km with average swimming speed of 0.63 m/s for six hours. The average swimming depth and water depth of the seabed on the route of WC1 were 7.2 and 32.9 m, respectively. The movement range of WC2 and WC3 were 7.95 and 11.06 km, approximately, with average swimming speed of 0.44 and 0.58 m/s for 5.1 and 5.3 hours, respectively. The average swimming depth of WC2 and WC3 were 18.7 and 5.0 m, and the water depth on the route, 34.4 and 29.8 m, respectively. Three fishes WC1 to WC3 were shown significant directionality in the movement (p < 0.05). Movement mean angles of WC1 to WC3 were 77.7, 76.3 and $88.1^{\circ}$, respectively. There was no significant correlation between the movement direction of fish (WC1 and WC2) and the tidal currents during the experimental period (p >= 0.05). Consequently, three tagged fishes were commonly moved toward outside of the entrance and headed for eastward of the Korean Peninsula, approximately, after release. It may estimate positively that the tidal current speed may affect to the swimming speed of the Pacific cod during the spring tide than the neap tide.

Keywords

Pacific cod;Behavior;Acoustic telemetry;Movement;Swimming speed

Acknowledgement

Supported by : 부경대학교

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