Dynamic characteristics of Sv, representing diel variability of fish within full depth range

• Autorzy: Orłowski A.
• Konferencja: Proceedings of the 2 nd EAA International Symposium on Hydroacoustics 24-27 May 1999, Gdańsk-Jurata POLAND
• Języki publikacji: EN

Abstrakty

EN

Acoustic methods could play an important role in monitoring vertical and horizontal fish distribution; including fish stock assessment, however the fish as acoustic target is not precisely specified still. The paper describes a new type of approach to express diel variability of acoustic parameter Sv, characterizing fish volume density. Multi-depth-channel integration of fish echoes was applied to estimate the average dil models of Sv dependence on time of a day. The final characteristics was calculated by computer as a vectoral field, showing quasi-continuous diel transformation of depth distribution of Sv values. Example based on data collected during October 1996 RV "Baltica" research cruise was given and discussed. Strong variability of Sv values with time and depth was exposed and clearly different diel phases of fish behaviour were separated. Results indicate a necessity of further research on fish target strength within separate periods of a diel cycle, to define more accurately biomass conversion factors. The method shown could enreach significantly systematic physiotogical studies on fish behaviour also.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 1999
• Tom: Vol. 2
• Strony: 15--20
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Orłowski A.

• Sea Fisheries Institute, ul. Kołłątaja I, 81-332, Gdynia, POLAND

Bibliografia

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