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The fish discards surveys, conducted by Northern Ireland, Spain and England under the auspices of EC project 95/094, are multistage in design with a structure of hauls within trips within vessels. The data collected by on-board observers from these surveys enabled investigation into the optimal number of hauls, trips and vessels that require sampling to achieve target levels of precision for each...
Two sampling methods, equal probability and probability proportional to x (ppx), were investigated in order to recommend an optimum sampling strategy for carrying out a discards survey in the Irish Sea. The objective of the survey, which took place from April 1997 to August 1998, was to estimate the quantity of fish discarded at fleet level by Northern Ireland trawlers. Additional data collected from...
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