#TITLE_ALTERNATIVE#

• Main Author: YULANDA (NIM 24006048), OSKAR
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8892
• Institution: Institut Teknologi Bandung

Swimming crab (portunus pelagicus) are one of exported-fish commodities from Kabupaten Belitung. Kecamatan Badau and Membalong are the areas of Kabupaten Belitung whose swimming crab catch is quite big; i.e. 90 % of the catch. Swimming crabs production of these two districts tends to increase. In 1997 it reached 293 tons, and increased to 530 tons in 2003. However, it stagnated in 2003-2007, i.e. about 600 tons, while the catching effort of swimming crab kept on increasing. If this is not comparable to the growth of fish resources, the stock will eventually be decreasing and leading to decrease of fish catch for fishermen. <br /> <br /> <br /> <br /> This research is aimed at studying the structure of the problems concerning the managements of swimming crab and estimating the tendencies which might occur if there are no interventions of the policies. Indicators applied to investigate such tendencies are the availability of continuous fishery resources of swimming crab, catch production, fishermen’s sources of income, industrialists of swimming crab processing, and the absorption of manpower. <br /> <br /> <br /> <br /> The research methodology used is system dynamics-focusing on the interrelationship between swimming crab resources, swimming crab catch activities, and social economy of fishermen in both Kecamatan Membalong and Badau of Kabupaten Belitung. The model of swimming crab resources is arranged based on fishery bio-economy, while the one of catching on the similarities of Willen’s open access. The model behavior is a reference for the arrangement of policy designs for the structure of the model. Several policy alternatives are then attempted to gain policy choices supporting the preservation of swimming crab resources and the sustainability of business. <br /> <br /> <br /> <br /> The basic model shows that swimming crabs were at the beginning increasing because the growth rate of this biomass was higher than their catch. Then, they keep on decreasing while there has been a rapid increase in terms of catching. The decrease of swimming crab supplies, therefore, leads to the decrease of the income of fisherman, swimming crab-processing industrialists, and of resources are actually the support of the continuity of swimming crab-processing industries. Consequently, if the preservation of swimming crab resources is disturbed, the swimming crab-processing industries will also be disturbed. <br /> <br /> <br /> <br /> Some scenario are then attempted by policy-making intervention through the model structure. This is intended to improve the model behavior as expected. Such scenario cover the policies for marine preserved areas, the limitation of mesh sizes, the application of export quota, and penalties for the excessive sustainable effort. <br /> <br /> <br /> <br /> For maintain sustainability of catch effort, the scenarios of the limitation of mesh sizes (scenario III) and penalties (scenario V) are the best choices. The policy choice of scenario III will certainly support biomass supplies longer than that of basic behavior. This policy, however, can only be applied for the short term. The long-term policy application will result in the excessive effort sustainable because of higher demands of catching. It is, therefore, necessary to arrange the allowed catches. Penalties for every excessive effort sustainable of simulation have the tendencies of behavior of the total catch and the growth rate of swimming crabs in balance, so that the resources will sustainable. <br />