Judul: Penaksiran Berat Tuna (Thunnus sp) dan Cakalang (Katsuwonus pelamis) di Provinsi Sumatera Barat
Abstrak: Tuna is a very important group of fish traded and consumed worldwide. The increasing needs on this commodity have brought a significant attention to study many aspects of the fish, e.g. conservation, fishing, and management. Bungus and Muara Padang are two important tuna and skipjack tuna landing sites in the West Sumatera. This paper describes a proses of data collection of tuna skipjack tuna production in the two sites, bias of tuna skipjack tuna production data from actual production, and a proposed procedure to improve data quality of tuna skipjack tuna landings in Bungus and Muara Padang. Current practice of data collection of tuna skipjack tuna landings in the two sites did not include measuring the fish weights. Local statistics of tuna skipjack tuna used reports that built on daily compilation of records from fish auction that described number of fish (not the weight) and the price payed by the buyers. For tuna and skipjack tuna, Statistical analysis (pair t-test) on the weight estimates (made by fisheries officials and fleet managers) and actual weights conclude a significant difference, eg, the estimates were generally lower than the actual weights (a = 0,05). we should be careful with estimates made by fisheries officials or fleet managers when weighing is absence in landing sites, especially when data are fish stock assessment. Some recommended improvements include implementation of proper data collection procedure and good coordination on data collection and data sharing among stakeholders of the tuna fisheries.
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Judul: Analisis ukuran hasil tangkapan ikan Tuna Mata Besar (Thunnus obesus) di PT Perikanan Samodra Besar Cabang Benoa, Bali
Abstrak: Ikan tuna mata besar dan jenis-jenis tuna lainnya mempunyai nilai ekonomis yang tinggi di pasaran internasional. Indonesia mempunyai potensi lestari ikan tuna termasuk ikan tuna mata besar sebesar 178.368 ton per tahun (Ditjen Perikanan, 1992). PT. Perikanan Samodra Besar cabang Benoa, Bali merupakan salah satu perusahaan penangkapan ikan yang menggunakan longline untuk menangkap ikan tuna mata besar. Keberadaan informasi mengenai ikan tuna mata besar sangat diperlukan agar usaha penangkapan yang dilakukan oleh perusahaan tersebut berhasil. Berbagai upaya telah dilakukan oleh berbagai pihak dengan mengadakan survei, eksplorasi dan menganalisis hasil tangkapan tuna mata besar agar didapat informasi yang berguna mengenai ikan tuna mata besar. Penelitian ini bertujuan mengetahui hubungan panjang cagak ikan dengan berat ikan, hubungan lebar ikan dengan berat ikan dan menganalisis ukuran berat ikan, panjang cagak ikan, dan lebar ikan tuna mata besar yang tertangkap oleh PT. Perikanan Samodra Besar cabang Benoa, Bali dengan menggunakan longline pada periode waktu penangkapan Pebruari April 1995. ..dst
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Judul: Katalis Eterifikasi Gliserol Berbasis Poli–(asam stirena sulfonat) dari Limbah Styrofoam.
Abstrak: Styrofoam waste can be converted to poly–(sulfonate styrene acid) (PSSA) that can be used as catalyst. The objective of this research is to get PSSA that can catalyze the etherification of glycerol and benzyl alcohol. The styrofoam waste was converted to PSSA by reacting with H2SO4 98% (as sulfonation agent) and P2O5 (as sulfonation catalyst) at 40 °C for 6 hours. Characterizations of PSSA included functional groups, sulfonation levels, water swelling, and thermal stability. The yield of PSSA was 40-55%. The success of sulfonated polystyrene was shown by –SO3H group absorption at 1157.29 cm-1. Etherification of glycerol and benzyl alcohol using PSSA catalyst was conducted at 110 °C for 12 hours. The conversion in producing mono–benzyl ether glycerol was 8.10%, 1,3–dibenzyletherglycerol 2.60%, and dibenzyl ether 9.80%. Therefore, the PSSA can be used as etherification catalyst.
Keyword: benzyl alcohol, etherification, glycerol, polystyrene, PSSA