New Zealand Journal of Marine and Freshwater Research abstracts

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Two acoustic surveys of pelagic fish in Hawke Bay, New Zealand, 1980

R. I. C. C. FRANCIS

Fisheries Research Division Ministry of Agriculture and Fisheries P. O. Box 297, Wellington New Zealand

Abstract The design and execution of two acoustic surveys of Hawke Bay in February and September/October 1980 are described. Though the resulting acoustic data were, for technical reasons, of limited value, they illustrate the information which may be drawn from acoustic surveys. Fish distributions may be rapidly mapped, not only by area, but throughout most of the water column and over time. Qualitative observations on fish distribution may be quantified. The estimation of variance in acoustic surveys is discussed in detail with particular emphasis on the problems of systematic surveys. The role of replicate observations is stressed. Coefficients of variation for relative fish density estimates from the two surveys probably lie between 5 and 30%.

Keywords Hawke Bay; acoustic surveys; pelagic fish

New Zealand Journal of Marine and Freshwater Research, 1985, Vol. 19: 375-389 Received 26 June 1984; accepted 27 November 1984

PDF file of entire paper: medium quality (1059K); (scanned from paper original: notes about this process)

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