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In April 1992 Seafish were contacted by Rob Whitehead, Operations Manager, for Irvin & Johnson, for advice on the use of square mesh panels as means of improving selectivity in trawl gear. As a result of the initial contact a visit was made to Cape Town where my services were employed by Irvin & Johnson in an advisory capacity. I was asked to brief senior management on current research generally regarding the use of square mesh, as well as making recommendations and observations on the probable effects of square mesh on catch rates, fish quality, selectivity etc., in the South African Hake Fishery. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.