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Research Document 1997/81

Distribution and abundance of Atlantic cod from an acoustic survey of Bonavista Bay / Trinity Bay during the fall of 1996

By J.P. Wheeler and D.S. Miller

Abstract

An acoustic survey was conducted during the fall of 1996 in the coastal waters of Bonavista Bay - Trinity Bay, Newfoundland. The survey area included water depths from the coastline to the 120 m contour. Echo integration along a series of equidistant parallel transects within the survey area provided distributional information, densities and a biomass estimate of Atlantic Cod. The biomass estimate was found to be very sensitive to the size of an exclusion zone adjacent to the bottom, defined during data editing to ensure that acoustic signals from the bottom were not included as fish.

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