Determination of Pelagic Fish Shoals in Izmir Bay Using Acoustic Method

Özgül A. , Lök A. , Şen H.

5th International Eurasian Congress on "Natural Nutrition Healthy Life & Sport", Ankara, Turkey, 2 - 06 October 2019, vol.1, no.1, pp.229-237

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.229-237


In pelagic fishing, Izmir Bay is one of the important points in the Turkish Coasts of the Aegean Sea. The aim of this study is to determine the distribution of the pelagic fish shoals in Izmir Bay by using the acoustic method. The study was carried out in June 2019 at 3 different stations, Ship-Route, Gülbahçe and Mordoğan in the İzmir Bay. Biosonics DT-X scientific echo-sounder (120 kHz split-beam) by mounted on the EgeSüf research vessel was used in this study. The line transect sampling was preferred for the determination of pelagic fish shoals and, Humminbird 1198-SCI navigation equipment was used in the formation and following of transects. Biosonics Visual Acquisition-6.2 software was used for acoustic data collection and Biosonics-Visual Analyzer 4.3 program was used for data analysis. In this study, 481 fish shoals in Ship-Route, 119 fish shoals in the Gülbahçe and 71 fish shoals in the Mordoğan were identified. Although the depths of the fish flocks ranged from 5.1 and 55.4 m, the average number of fish per unit area was calculated between 2.1510 and 8.4431 FPUA. According to the stations, the mean TS were determined as -46.12 dB. As a result of this study, the Ship-Route station with deeper waters has a higher school of fish. This study, if supported by oceanographic data, may be useful in determining fishing prohibitions for fisheries management.