Here are the links to some reports by ICES task forces looking at sample design, sample methods, and other relevant things:
Survey Design and Data Analysis
http://www.ices.dk/reports/FTC/2005/WKSAD05.pdf
(summary)
Fisheries Acoustic Science and Technologies
http://www.ices.dk/reports/FTC/2007/WGFAST07.pdf
(summary)
Unaccounted Fishing Mortality
http://www.ices.dk/reports/FTC/2005/SGUFM05.pdf
(summary)
Survey Trawl Standardization
http://www.ices.dk/reports/FTC/2007/SGSTS07.pdf
(summary)
Fisheries Optical Technology
http://www.ices.dk/reports/FTC/2007/SGFOT07.pdf
(summary)
Fish Avoidance of Research Vessels
http://www.ices.dk/reports/FTC/2007/SGFARV07.pdf
(summary)
Acoustic Data from Fishing Vessels
http://www.ices.dk/reports/FTC/2006/SGAFV06.pdf
(summary)