Judul: Keberlanjutan Program Sea Farming di Perairan Kepulauan Seribu, Propinsi DKI Jakarta: Analisis Penangkapan Ikan Rucah sebagai Pakan Utama
Abstrak: In order to improve the fish stock, rehabilitation of fish habitat and creating an alternative income for local fishermen in Seribu Island, an integrated program of sea farming has been developing by the local government and supported by Center for Coastal and Marine Resources Studies (CCMRS/PKSPL) IPB. Brown-marbled grouper and humpback grouperhas been selected as the main farming species for this program. The development of grouper aquaculture activites in sea farming needs trash fish as main feed which is derived from fish by sea farming fisherman group and by bought from the others fishermen. The main fishing gears used by the sea farming fisherman’s group in Seribu Islands were fish hook, nylon hook, trap and gill net. This study was conducted in order to investigate the caracteristics of trash fish as a main feed for the sea farming program; to estimate the avaibility and needs of the trash fish for the sea farming program; to evaluate the feasibility of the integrated sea farming business of the trash fish basis in the study area. The result showed that there were 19 species of trash fish has been identified in the study area. The diversity of trash fish which caught by sea farming fisherman’s groups was less than those on another fishermen group. The avability of the trash fish in Seribu Island that caught by sea farming fishermen’s group can fulfill the cultivation needs. Sea farming fishermean group was profitable due to the high value of revenue cost ratio (R/C > 1). The financial analysis indicated that the sea farming fishermen’s group who only bought the trash fish was more profit than the group who caught the trash fish by them self.
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Judul: Usaha perikanan teripang dan pengembangannya di Kepulauan Seribu Provinsi DKI Jakarta
Abstrak: Sea cucumber is one of the export commodities that increases every year. Seribu Islands are potential producers for sea cucumber in Indonesia. Increasing catching activities may lead to excessive exploitation. This research was conducted in Panggang Island, Seribu Islands, Jakarta and aimed to describe the system of sea cucumber fishery, determine its feasibility and to arrange the strategy of its development. Systems approach was used as the method. Result showed that the fishing seasons of sea cucumber occurred during January-April and October- November. Sea cucumber fishery used diving method and they were directly caught by hands. Marketed product was dried sea cucumber which was exported to Europe, America, Japan and Singapore. The value of R/C was 1.32 and the value of PP was in 6,37 months. Five priorities in the implementation of business development strategies are optimizing business and potential market, increasing the quality of the human resources, enhancing the capital cooperation, monitoring the activity of fishery and restocking.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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