|Bortier-Verstraaten, Mabel Borteley
|The commercial tuna fishery of the East Atlantic and like wise the Ghanaian
tuna fishery are based on the harvests of Bigeye, Skipjack and Yellowfin. In Ghana,
baitboats and purse seiners commercially harvest these species of tuna.
This study analysed the CPUE for the Ghanaian tuna fishery. The analysis
was made for the three species and also for the two vessel types. The effort was
standardized to large purse seiner days. The results when compared to the CPUE per
species for the East Atlantic revealed that the Ghanaian vessels (1980 – 2000) were
in some cases up to 40 times more efficient than large purse seiners in the East
A single species bioeconomic analysis was conducted for each of the three
species using biological parameters adopted from Conrad and Adu-Asamoah (1986).
This showed that present harvest levels of Skipjack and Yellowfin for the East
Atlantic region were in excess of the open access equilibrium. Thus a decline in
future harvest levels of Skipjack and Yellowfin is expected.
Sustainable economic rents calculated for the two-vessel types revealed that,
bioeconomically, baitboats are more profitable than purse seiners. It was observed
that the FAD’s might be the main cause of changes in the species composition ratio
of the tuna catches over the past decade.
|Universitetet i Tromsø
|University of Tromsø
|Copyright 2002 The Author(s)
|VDP::Samfunnsvitenskap: 200::Økonomi: 210::Samfunnsøkonomi: 212
|VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Fangst: 925
|A bioeconomic analysis of the Ghanaian tuna fishery (1980-2000)