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Browsing by Author "Geromont, Helena F"

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Complex assessments or simple management procedures for efficient fisheries management: a comparative study

Author: Geromont, Helena F ; Butterworth, Doug S Date: 2015 Complex stock assessment methods are data- and expertise-hungry, with the annual updates of catch-at-age data and models typically seen as an essential requirement for sound management. But are the heavy commitments of resources required for ... Read more
Does selectivity matter? A fisheries management perspective

Author: Butterworth, Doug S ; Rademeyer, Rebecca A ; Brandão, Anabela ; Geromont, Helena F ; Johnston, Susan J Date: 2014 The authors’ experiences in relation to the estimation of selectivity and its impact on the formulation of management advice are summarised for 14 different resources. These include instances where advice (generally in the form of a catch ... Read more
Generic management procedures for data-poor fisheries: forecasting with few data

Author: Geromont, Helena F ; Butterworth, Doug S Date: 2015 The majority of fish stocks worldwide are not managed quantitatively as they lack sufficient data, particularly a direct index of abundance, on which to base an assessment. Often these stocks are relatively “low value”, which renders dedicated ... Read more
Generic management procedures for data-poor fisheries:forecasting with few data

Author: Geromont, Helena F ; Butterworth, Doug S Date: 2015 The majority of fish stocks worldwide are not managed quantitatively as they lack sufficient data, particularly a direct index of abundance, on which to base an assessment. Often these stocks are relatively “low value”, which renders dedicated ... Read more
Generic MPs for data-poor fisheries: Southern hemisphere collaboration.

Author: Butterworth, Doug S ; Geromont, Helena F Date: 2010 The focus of the Southern Hemisphere Collaboration amongst Australia, New Zealand and South Africa is the Management Procedure approach, also known as Management Strategy Evaluation (MSE), as a better basis to manage fisheries. The primary ... Read more
Initial investigation of generic management procedures for data-poor fisheries

Author: Geromont, Helena F ; Butterworth, Doug S Date: 2010 The vast majority of fish stocks in South Africa are not managed quantitatively as there is not sufficient data (such as an index of abundance) on which to base a resource assessment. In addition, these stocks are relatively “low-value”, which ... Read more
An initial reality check on estimates related to black-browed albatross kills in the trawl fishery

Author: Butterworth, Doug S ; Geromont, Helena F Date: 2010 The SASSI Kingklip assessment makes certain key statements about the kills of black-browed albatross (the avian species most at risk of those they consider) in the SA trawl fishery: an annual kill of 5000 in 2006 (all birds 18000) a ... Read more
Performance review of simple management procedures

Author: Carruthers, Thomas R ; Kell, Laurence T ; Butterworth, Doug S ; Maunder, Mark N ; Geromont, Helena F ; Walters, Carl ; McAllister, Murdoch K ; Hillary, Richard ; Levontin, Polina ; Kitakado, Toshihide ; Davies, Campbell R Date: 2015 Using a management strategy evaluation approach, we compare a range of new and established management procedures (MPs) for setting catch-limits in fisheries. Performance is evaluated with respect to fish life history type, level of stock ... Read more
Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model

Author: Geromont, Helena F ; Butterworth, Doug S Date: 2011 An age-structured production model (ASPM) is used to assess the Carpenter resource off the south western coast of South Africa. The model is fitted to standardized CPUE and length frequency linefish data. Problems encountered when attempting ... Read more

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Browsing by Author "Geromont, Helena F"

Browsing by Author "Geromont, Helena F"

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