Acoustic experiment on diel fish behaviour cycle performed in the Gotland Deep

• Autorzy: Orlowski A.
• Języki publikacji: EN

Abstrakty

EN

This paper describes the results of 24 h acoustic experiment based on three-dimensional measurements of the S; distribution of herring and sprat in the southern Baltic in October 2001. The experiment was based on a continuous (24h day) integration offish echoes using an EY500 echo sounder from a vessel with a constant speed of 8 knots, moving along the sides of a square equal to 4 n.mi., localized inside the specified area. Duration of the experiment was limited by deterioration of the weather conditions but nearly 300 ESDU samples were collected. These are correlated with values of coincident environmental factors: time, depth, water temperature, salinity and oxygen levels; estimated on the basis of survey data. Fish behaviour vs environmental factors is described by different macrosounding visualizations, statistical, and mathematical models. The purpose of the paper is to compare results of the experiment to the average characteristics of fish behaviour in the same basin, based on autumn studies over the period 1995-2001. General analysis was provided for the selected area of the Polish EEZ (south Gotland Deep), characterized by the greatest depth movements of fish diel migration. The most significant differences were found between fish migration pattern and diel stability of the acoustic response between these situations, specially during the sunset period.

Słowa kluczowe

EN

acoustic experiment; Gotland Deep; echo sounder

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2003
• Tom: Vol. 6
• Strony: 19--30
• Opis fizyczny: Bibliogr. 16 poz., rys.

Twórcy

autor

Orlowski A.

• Sea Fisheries Institute Kołłątaja l, 81-332 Gdynia, Poland

Bibliografia

• 1. M. Cardinale, Casini, M., Arrhenius, F., Hakansson, N., Diel spatial distribution of zooplanktonovorous fish related to feeding activity in the Baltic Sea. 6 th ICES Symposium on Acoustics and Aquatic Ecology, Montpellier (France), 10-14 June 2002, Papers CD, 2002.
• 2. G. S. Helfman, Colette, B. B. , Facey, D. E., The Diversity od Fishes, Blackwell Science, pp. 1-528, Oxford 1997.
• 3. H. P. Knudsen, The Bergen Echo Integrator: An Introduction, ICES Journal ofMarine Science, 47,167-174,1990.
• 4. J. M. Jech, Luo, J., Digital echo visualization and in-formation system (DEVIS) for processing spatially explicit fisheries acoustic data, Fishery Research, 47 ,115-124, 2000.
• 5. L. Mayer, Yanchao, L., Melvin, G., 3D visualization for pelagie fisheries research and assessment, ICES Journal of Marine Science, 10, 1-10, 2001.
• 6. L. A. Nilsson, Thygessen ,u. H., Lundgren, B., Nielsen, B.F., Nielsen, lR., Beyer, lE., Modelling the dispersive migration of sprat (Sprattus sprattus) and herring (Clupea harengus) schools at dusk in the Baltic Sea. 6 th ICES Symposium on Acoustics and Aquatic Ecology, Montpellier (France), 10-14 June 2002, Papers CD, 2002.
• 7. L. Nettestad, Extensive gas bubble release in Norwegian spring-spawning herring (Clupea harengus) during predator avoidance. ICES Journal of Marine Science, 55, 1133-1140, 1998.
• 8. E. Ona., An expanded target strength relation for herring. 6 th lCES Symposium on Acoustics and Aquatic Ecology, Montpellier (France), 10-14 June 2002, No. 37, Papers CD, 2002.
• 9. A. Orlowski, Macrosounding as a new concept in the study of marine ecosystems, Colloque de Physique., c2, (n2) 51, 69-72, 1990.
• 10. A. Orlowski, Acoustic methods applied to fish environmental studies in the Baltic Sea, Fishery Research., 34(3), 227-237,1998.
• 11. A. Orlowski, Acoustic studies of spatial gradients in the Baltic: Implication for fish distribution, ICES Journal of Marine Science, 56, 561-570, 1999.
• 12. A. Orlowski, Diel dynamie of acoustic measurements of Baltic fish, ICES Journal of Marine Science, 57, 1196-1203, 2000.
• 13. A. Orłowski, Environmental effect on acoustic measurements of Baltic fish (part 2), Hydro-acoustics (Annual Journal), vol. 4, E. Kozaczka and G. Grelowska (Ed.), Naval Academy in Gdynia, Gdynia, 2001,193-196, 2001.
• 14. A. Orlowski, Behavioural and physical effect on acoustic measurements of Baltic fish within a diel cycle, ICES Journal of Marine Science, 58, 1174-1183,2001.
• 15. A. Orlowski, Acoustic semi-tomography applied to estimate fish response to environmental variability, Proceedings of the Sixth European Conference on Underwater Acoustics, ECUA '2002, 24-27 June 2002, Gdansk, Poland. Editor A. Stepnowski, Gdansk University of Technology, 423-428, 2002.
• 16. J. Szczucka, Acoustically measured diurnal vertical migration of fish and zooplankton in the Baltic Sea - seasonal variations, Oceanologia, 42(1), 5-17,2000.