Judul: Evaluation of Coastal Area Suitability for Groupers (Family Serranidae) Mariculture Development in Pongok Island, Bangka Selatan Regency
Abstrak: The suitability of areas for groupers (Family Serranidae) mariculture with the floating net cage (FCG) system in the waters of the Pongok Island of Bangka Selatan Regency is based on biotechnics aspect or environmental parameters. The commodities that can be cultured are groupers namely of Polkadot cod (Plectropomus areolatus), Flowery cod (Epinephelus fuscoguttatus), Mud grouper (Epinephelus suillus), and Queensland grouper (Ephinephelus lanceolatus), and Barramundi cod (Cromileptes altivelis). The suitable area for groupers mariculture with FCG system is approximately 3,474.66 ha. The carrying capacity of Pongok Island waters with 3,474.66 ha area suitable for groupers with FCG system is as many as 1,670 community groups of FCG, equivalent to 16,700 FCG units or a maximum can support as many as 16,700 head of the family or the equivalent of 66,800 FCG holes. The calculation on mariculture with the FCG system for groupers (Famili Serranidae) based on economic analysis of R/C, PP, BEP, NPV, Net B/C, and IRR as feasible to be developed and can be an alternative livelihood for local community. The strategies of groupers mariculture management need to be taken are determine and arrange the location of culture, the implementation of the model of community groups, infrastructure development, the establishment of institutional systems, and government policy related to grouper area of culture.
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Judul: Penentuan kesesuaian lahan keramba jaring apung kerapu macan (Epinephelus fuscogutattus) menggunakan sistem informasi geografis di pulau panggang Kepulauan Seribu
Abstrak: Conformity site selection for mariculture Tiger Grouper (Ephinephelus fuscogutattus) in net floating cages has been done in Panggang Island, Thousand Islands by using Geographical Information System. The evaluation of water quality in Panggang Island was based on physical and chemical aspecs, so Panggang Island is suitable for mariculture Tiger Grouper (Ephinephelus fuscogutattus) in net floating cages. The parameter were observed to see the water quality include substrat parameter, depth, protected area, temperature, salinity, dissolved oxygen, brightness, flow rate, pH and amoniac. The result shows that the area for mariculture of Tiger Grouper (Ephinephelus fuscogutattus) in net floating cages accounts for 0,94 Km2 in category class very suitable, 2,32 Km2 in category class suitable, and 3,20 Km2 in category class not suitable.
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Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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