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Commercial fishing patterns in Australia's Northern Prawn Fishery and implications for management


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Ngwenya, Elkana 2001 , 'Commercial fishing patterns in Australia's Northern Prawn Fishery and implications for management', PhD thesis, University of Tasmania.

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This thesis is focussed on the variation in fishing patterns realised by commercial
fishers in Australia's Northern Prawn Fishery (NPF). An analytical framework is
developed for use as a tool to help fishery managers understand commercial
fishers' decision making and the subsequent fleet dynamics in commercial
fisheries and their implications for fishery management. The thesis provides a
framework based on Markovian theory that permits a description of the spatial
and temporal allocation of fishing effort, and allows for the simulation of fleet
movement in response to fishery management policy changes. The relocation of
fishing effort between fishing grounds, over time, defines the spatial and temporal
dynamics of fleet movement. Data on fishing locations of individual vessels are
used to obtain a spatial and temporal series of transition probabilities, which are
then used for describing and forecasting commercial fishing behaviour. These
transition probabilities represent the likelihood of effort allocation to selected
fishing grounds, over any two consecutive time periods. The ordinary Markov
model relies solely on the historical transitions for the entire fleet across particular
fishing grounds during a selected fishing period. However, since the transitions
made by fishers are the outcome of economic behaviour and decision making in
fishing, the variation in transition probabilities and the fishing patterns realised by
commercial fishers are explained in the thesis using the multinomial logit (MNL)
approach. To capture fishers' response to fishery policy, the ordinary Markov
model is enhanced using estimates from the MNL model. This enriched Markov
model, referred to as the MNL Markov, requires data on policy variables and
characteristics of fishers and fishing grounds. Although not primarily policyoriented,
the effects of shortening the fishing season and closing selected fishing
grounds are illustrated by inspecting the marginal effects of policy variables from
the MNL Markov and evaluating the limiting distribution of transition
probabilities in the ordinary Markov model. The results obtained in the thesis
suggest that there is scope for fishery managers to use such models to forecast
changes in commercial fishing patterns in the NPF that result from management
changes such as shortening the fishing season and closing selected fishing

Item Type: Thesis - PhD
Authors/Creators:Ngwenya, Elkana
Keywords: Shrimp fisheries
Copyright Holders: The Author
Copyright Information:

Copyright 2001 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D)--University of Tasmania, 2001. Includes bibliographical references

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