Judul: Pengaruh Penangkapan Ikan terhadap Komposisi Tingkat Trofik (Trophic Level) di Kepulauan Seribu
Abstrak: Trophic level is a structure of organism in food chain. The using both selective or non selective fishing gears has potential effects on the food chain. Thus, the important question is whether the caught at a certain trophic level relate to the used fishing gears. The study aimed: (1) to describe the status of fisheries in Seribu Islands; (2) to determine the composition of caught based on fishing gear types; and (3) to identify the potential impacts on ecosystem. The result of this study showed that the major fishing gears in Seribu Islands were seine net, muroami, gill net, hook and line as well as „bubu tambun‟ (trap). Most of the catch in the study area were redbelly yellowtail fusilier and goldlined spinefoot; the average length were 19 ± 4,0 cm and 22,4 ± 1,5 cm respectively. Further more, the average weight were redbelly yellowtail fusilier (110,6 ± 103,7 gr) and goldlined spinefoot (163,6 ± 58,5 gr). Majority, trophic level of catch was carnivores which prey the smaller fish and cephalopods (TL5: 4.0 – 4.5) e.g. frigate mackerel. This study has indicated that there was an impact of fishing on the ecosystem, particularly the balance of the food chain.
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Judul: Dampak Penangkapan Ikan terhadap Keseimbangan Trofik Level pada Habitat Lamun di Kepulauan Seribu, Provinsi DKI Jakarta
Abstrak: Fishing impacts of small-scale gears operating on seagrass habitat at Seribu Islands, DKI Jakarta Province, was quantified based on a widely accepted ecosystem measure and the ecology structure and the trophic level (TL) indicators. Trophic level of captured fish was evaluated during period October 2011 to April 2012. Fish samples were taken by means of experimental fishing using a set gillnet. In order to evaluate feeding habit a stomach content analysis that consist of quantity, volumetric and frequency of occurrence methods was conducted. The feeding habit data was analyzed by means of Relative Importance and Preponderance Indexes. Trophic level was analyzed base on three cases which found. Result showed that dominant of captured fish came from Holocentridae, that was redcoat (Sargocentron rubrum) and Belonidae that was spottail needlefish (Tylosurus strongylura) with each proportion 26 % of samples. The further dominant of captured fish fish was striped monocle bream (Scolopsis lineata) with proportion 14,5 % of samples. Size of the mean length of dominant captured fish were spottail needlefish (65,9 ± 21,7 cm), striped monocle bream (17,4 ± 1,4 cm) and redcoat (16,5 ± 1,6 cm). Size of the mean weight of dominant captured fish were spottail needlefish (584 ± 245 gr), redcoat (87 ± 30 gr) and striped monocle bream (77 ± 19 gr). Fish in the study area was dominated by herbivorous and demersal feeders. Many fishes that were captured on TL2 had potential to cause unbalanced trophic level in that fishing ground.
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Judul: Simulasi Protokol Autentikasi Pelanggan pada Voice Privacy
Abstrak: Existing design of the telephone public network is susceptible to eavesdropping on its voice stream. Consequently, any wire taper can listen to supposedly private conversation. In order to prevent such eavesdropping, we propose a protocols and its implementation for end-to-end voice privacy authenticate as a service available for interested subscribers. Our protocols consist of customer enrollment system, customer authentication system and simulation voice privacy. Protocols that we made are adaptation from Sharif and Wijekesera journal with the title Providing Voice Privacy as a Service over the Public Telephone Network. The result of the process shows how the customer enrolls and how the system process the password, how the system authenticate customer simulate voice privacy.
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