The effect of hook size on the size-specific selectivity of hottentot Pachymetopon blochii (Val.) and on yield per recruit

  • Published source details Punt A.E., Pulfrich A., Butterworth D.S. & Penney A.J. (1996) The effect of hook size on the size-specific selectivity of hottentot Pachymetopon blochii (Val.) and on yield per recruit. South African Journal of Marine Science, 17, 155-172.


This study is summarised as evidence for the following.

Action Category

Use a different hook type

Action Link
Marine Fish Conservation
  1. Use a different hook type

    A replicated study in 1985 in coastal waters in the Atlantic Ocean off Western Cape, South Africa (Punt et al. 1996) reported that changing hook type (size) resulted in different lengths of hottentot Pachymetopon blochii caught, and size range generally increased with larger hooks. No statistical tests were carried out. The average length of hottentot caught was 260 mm (range: 177–369 mm) with the widest hook used (18.3 mm), 258 mm (range: 160-385 mm) with a 14.4 mm hook, 251 mm (range: 160-351 mm) with a 10.7 mm wide hook, and 231 mm (range: 160-350 mm) with a 7.0 mm wide hook. Experimental line fishing for hottentot was done by 12 anglers over two days in September 1985 using four sizes of Mustad-type hooks (18.3, 14.4, 10.7 and 7.0 mm). Fishing gear was configured to match the traditional line fishery of the region and was undertaken from three dinghies in a marine reserve five nautical miles off the Western Cape. Equal periods of fishing were carried out with each hook size (31 hours of fishing effort/angler). All fish captured were counted and fish length measured at sea.

    (Summarised by: Leo Clarke)

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