Crown Copyright © 2007. Published by Oxford Journals on behalf of the International Council for the Exploration of the Sea. All rights reserved
Current status of mobile and static sampling gears used in resource surveys
1 FRS Marine Laboratory, PO Box 101, 375 Victoria Road, Torry, Aberdeen, AB11 9DB, UK
2 Gulf of Maine Research Institute (GMRI), 350 Commercial Street, Portland, ME 04101, USA
3 Conservation Engineering and Fisheries Dependent Investigations, Massachusetts Division of Marine Fisheries, 1213 Purchase Street, New Bedford, MA 02740, USA
4 School for Marine Science and Technology, 838 South Rodney French Boulevard, New Bedford, MA 02744-1221, USA
5 Northwest Atlantic Fisheries Centre, Department of Fisheries and Oceans, 80 East White Hills Rd., PO Box 5667, St John's, NL, Canada A1C 5X1
Correspondence to D. Reid: tel: +44 1224 295363; fax: +44 1224 295511; e-mail: reiddg@marlab.ac.uk
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Survey sampling tools: challenges, themes and questions |
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Introduction
The conference proceedings included a session on the "Current status of mobile and static sampling gears used in resource surveys". The session had invited papers on the following types of study:
- Survey gear design and use, including innovations to meeting ecosystem survey requirements.
- Fish behaviour, gear rigging, and fishing strategies that affect survey trawl catchability, including vertical and horizontal herding and escapees, bridle angles, effect of tow duration, groundgear choice, bottom contact, and speed over ground and through water.
- Effectiveness of standardization and quality control programmes that focus on survey gear construction, rigging and repairs, and minimizing variation in catchability.
- Use of fish behaviour, and performance and geometry/stability data from instrumentation, in estimating catchability; raising catch per unit effort (cpue) to abundance estimation.
- Requirements for intercalibration of survey gears and survey vessels. The focus should be on experimental design and statistical analysis of data, including precision of intercalibration factors.
Our
Choice and integration of survey tools
Fish behaviour in relation to survey gear and modifications
How do you deal with all the factors that give bias and variance in gear catches?
Why we can make some changes to surveys easily and not others
Can we, should we, develop more software tools and laboratory studies to explore what happens with our gears in the sea?
Gear mensuration and behavioural observations: minimum standards for data collection on surveys for gear
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Conclusions |
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