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Survey design and analysis procedures: a comprehensive review of good practice

Simmonds, E. John; Williamson, Neal J.; Gerlotto, Francois; Aglen, Asgeir
Working paper
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URI
http://hdl.handle.net/11250/100293
Date
1991
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Original version
This report is not to be quoted without prior consultation with the General Secretary.  
Abstract
This paper provides a major review of acoustic survey and-data analysis procedures,

it has been prepared as a result of discussions in the FAST working group of ICES. A review

of published literature is combined with an assessment of methodology. A consideration of

information available a priori and its impact on the choice of survey area and survey design

is presented. The subject of predetermined survey tracks using both systematic and random

strategies is addressed, indicating the assumptions implied by these choices. Adaptive

strategies that might be required for mobile or less predictable spatia1 distributions are

discussed along with the advantages and the costs of an adaptive approach. The methods of

determining of stock species composition are examined. The methods for assessing the degree

of homogeneity species size and proportion are presented.

The important choice of averaging method i.e. how the samples provide information

on the true density within an area is examined. Sources of error within the estimate are

discussed. Firstly, methods for computing the spatial sampling error are examined, and

secondly, a summary of other sources of error is presented. A appraisal of these errors is

presented and provides an intrinsic error analysis. Finally a brief comparison of the results

of acoustic surveys with the results of other techniques is presented.

Throughout the paper the assumptions implicit in each choice are discussed, and

appropriate selections of survey design and analysis methods are presented in tabular form.

The paper concludes with a summary of recommended procedures.
Publisher
ICES
Series
ICES CM documents
1991/B:54

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