A simple standardisation of omnidirectional sonar in fisheries research through field calibration and sampling data

• Autorzy: Brehmer P. , Gerlotto F.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a method making a comparison of acoustic results on schools through the use of omnidirectional sonar (possible). The weakness of such sonar for fisheries acoustics is that there is no practical way to accurately calibrate them, due to the fact that they are not designed specifically for scientific research. The procedure employed is through the use in the field of a reference target allowing to compare the echoes from one beam to the other and to evaluate roughly the operational threshold for school identification. Some results from a calibration achieved on a SIMRAD SR240 in Venezuela, 1998, are detailed.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2001
• Tom: Vol. 4
• Strony: 27--30
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Brehmer P.

• IRD/HEA/Active, Pole RH (IRD/Ifremer), Sète, Av. J. Monnet, BP 171, 34203 Sete cedex, France

autor

Gerlotto F.

• IRD/HEA/Active, Pole RH (IRD/Ifremer), Sète, Av. J. Monnet, BP 171, 34203 Sete cedex, France

Bibliografia

• 1. Biosonics, DT series, Hardware & software. Biosonics Inc., Manual V 4.09, Jan 1997.
• 2. P. Brehmer, and F. Gerlotto, Methodology concept and preliminary analysis on omnidirectional sonar data. ECUA 2000, Lyon, 14-16 July, France 2000.
• 3. N. Diner, P. Marchand,. Acoustique et peche maritime. Brest, Ifremer, 147p. 1995.
• 4. E. Fernandes et al, 2000. Acoustic applications in fisheries science: the ICES contribution. ICES Journal of marine science (in pressi.
• 5. K.G. Foote, et al., Calibration 01' acoustic instruments for fish density estimation: a practical guide. ICES Coop. Res. Rep. n°. 144, 57pp. 1987.
• 6. P. Freon and O.A. Misund, Dynamics of pelagie fish distribution and behaviour: effects on fisheries and stock assessment, Blackwell, London, 1999.