Abstract
This paper includes a theory and methods of determining mesh selectivity curve for a specified mesh size of codend in trawlnet from a fishing experiment with several mesh sizes. On a few assumptions, the mesh selectivity of mesh size m for fish of length l was theoretically approximated by a function of (l-l0)/(m-m0) in certain ranges of l and m. Here, l0 and m0 are constants. On the basis of the above statement, the authors derived the respective methods for determining the mesh selectivity curve from covered-net and comparative fishing experiments. In addition, this paper applied the derived methods to Margetts' data as a numerical example and discussed some problems on the methods.
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