PERFORMANCE OF A FISHERY HARVESTING DIFFERENT MINIMUM SHRIMP SIZES IN THE ARAFURA SEA
Abstract: Avoiding overfishing
and ensuring the sustainability of the shrimp stock in the Arafura Sea are of
prime importance for fishery management. Exploited shrimp stock consists of
several cohorts, and grows considerably with age. When the shrimps are caught before
the cohort has had the opportunity to achieve its optimum biomass level, the
fishery will lose much of the potential benefit that could be achieved by
catching them in the near future. Therefore, a bio-economic approach was
developed, on the basis of the length-based Thompson & Bell model, to
evaluate the impact of harvesting different size of shrimps on fishery
performance. The result of analysis shows that the fishery achieved the optimal
total profit when the shrimp size at first-capture and fishing mortality were
29 mm CL and 0.50, respectively. The total profit to the fishery would be
sub-optimal when the shrimp size at-first-capture was smaller or larger than
the optimal size. Further, it was more economical to harvest shrimps at the
larger size and higher fishing mortality, and resulting in higher total profit,
when natural mortality decreased.
Keywords: Bio-economic;
Thompson & Bellmodel; shrimp fishery; optimumsize at first capture
Author: Purwanto
Journal Code: jpperikanangg120052
