Stock Assessment Research
Thursday, 26 February 2009 18:37

In the stock assessment section we carry out research in several broad areas. We carry out research to improve the regional assessments, by developing new methods and by new analyses of fishery data. We collaborate on this work with other research agencies, including organizations in Japan, Australia, USA, New Caledonia, Europe, Chinese Taipei, and New Zealand. We develop software to run the assessments, and to help fishery managers and stakeholders interpret the stock assessments and the resulting management advice.

 

 
Method development for WCPO stock assessments
Wednesday, 27 October 2010 11:58
We continually work to improve the accuracy and reliability of the stock assessments. Changes to assessment structure and methods are investigated and, where approved by the WCPFC Scientific Committee, included in the stock assessments.
For further information contact Shelton Harley, Simon Hoyle, or John Hampton.

 
Reference points for fishery management
Wednesday, 27 October 2010 11:59
Fishery reference points link stock assessment results with management action. We study the performance of alternative reference points.
For further information contact Shelton Harley, Nick Davies, or John Hampton.

 
Biological parameters for WCPO stock assessments
Wednesday, 27 October 2010 12:05
We develop better methods for estimating and modelling the biological parameters used in stock assessments, such as natural mortality, reproductive potential, and growth. We update biological parameters based on recent data. We also investigate the effects of alternative approaches on stock assessment results, and possible benefits of better data.
For further information contact Simon Hoyle or Simon Nicol.

 
Structural sensitivity analysis
Wednesday, 27 October 2010 12:04
Stock assessment models simplify reality. In some cases alternative assumptions can be made, and may give different results. The differences between the alternative results are part of the uncertainty in the results. We carry out sensitivity analyses to measure this uncertainty, and to work out the best ways to reduce it. We also develop new methods for structural sensitivity analysis.
For further information contact Simon Hoyle or Shelton Harley.

 
CPUE analysis methods
Wednesday, 27 October 2010 12:00
All of our main WCPO stock assessments use standardized catch per unit effort (CPUE) data as influential indices of abundance. We are researching better analysis methods, to provide more reliable CPUE indices.  
For further information contact Simon Hoyle or Shelton Harley.

 
Analysis of size frequency data
Wednesday, 27 October 2010 12:06
WCPO stock assessments fit to size (length and weight) data, and are sensitive to the way these data are collected, analyzed and modelled. We investigate ways to improve the assessments by improving the ways we use these data.
For further information contact Simon Hoyle.

 
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