Stock evaluation of giant scallop (Placopecten magellanicus) using high-resolution acoustics for seabed mapping

被引:84
作者
Kostylev, VE
Courtney, RC
Robert, G
Todd, BJ
机构
[1] Geol Survey Canada Atlantic, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada
[2] Bedford Inst Oceanog, Invertebrate Fisheries Div, Dartmouth, NS B2Y 4A2, Canada
关键词
multibeam backscatter; scallops; Placopecten magellanicus; habitat; benthos; mapping;
D O I
10.1016/S0165-7836(02)00100-5
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Survey designs in use for the evaluation of sea scallop stocks do not consider the variability of sediment type, despite strong evidence of its importance for the recruitment and survival of scallops on the sea floor. This study examines the distribution of scallops on Browns Bank, Scotian Shelf, at two test sites, in comparison to sea floor sediment distribution, with particular attention to the effects of small-scale sediment variability on the abundance of the commercially exploited scallop. important links between scallop abundance, sediment type and habitat structure are described. Scallops are strongly associated with gravel lag deposits, which are readily distinguishable from sand-covered terrain through the use of multibeam backscatter data. There exists a highly significant correlation between scallop survey catch rates and backscatter intensity which can be used for the prediction of scallop stock abundance. Developments in underwater acoustics enable for more precise sea floor mapping and contribute to better estimates of scallop abundance. Crown Copyright (C) 2002 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:479 / 492
页数:14
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