Biomass Survey results for Nightingale which include the recent February 2016 Leg 2 survey results

Johnston, Susan

Biomass Survey results for Nightingale which include the recent February 2016 Leg 2 survey results

Working Paper

2016-04

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

At the end of 2015, following indications in the recent biomass survey CAL data, provided by the September 2015 survey, that there may be a reduction in the 50-65mm size classes, concern was raised that this could be a “post-OLIVA” effect moving through the size classes and becoming evident only now due to the time lag between the OLIVA incident and possible resultant juvenile mortality. It was decided that although the stock assessments take only Leg 1 biomass survey data into account – and that the Leg 2 survey are no longer performed – that a once off Leg 2 biomass survey at Nightingale would be useful to examine this matter.

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