Towards an appropriate economic management regime of tuna fisheries in Ghana
Permanent lenke
https://hdl.handle.net/10037/306Dato
2003-06-02Type
Master thesisMastergradsoppgave
Forfatter
Obeng, VictorSammendrag
The Ghanaian tuna fishery is a baitboat and purse seine fishery. Three main species of
tuna are caught namely, Skipjack, Bigeye and Yellowfin. A detailed and
comprehensive set of catch and effort data for the tuna fisheries has been obtained for
the period 1980-2001.
Harvest functions have been designed and estimated. By maximising the loglikelihood
function by numerical methods, parameter estimates and performance
indicators of the different models were obtained. The best result was obtained for a
harvest model allowing inclusion of a time trend parameter. For this model the stockoutput
elasticity is assumed to be 1, the effort-output elasticity is estimated at 0.849,
and the technological change at about 3.6% annual increase in productivity.
Technical – Economic interactions among the species have been analysed. Different
periods where chosen for each period, cross – elasticity of supply calculated between
the species. The result indicated a mixed significance, which gives room for the
existence of technical – economic interactions among the species over the years,
considered. This suggests that single species management may be inappropriate for
the tuna fishery.
Forlag
Universitetet i TromsøUniversity of Tromsø
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Copyright 2003 The Author(s)
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