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: Suatu studi tentang prospek perikanan tuna dan cakalang di perairan Indonesia bagian timur
Abstrak: Perairan Indonesir Bagian Timur yang terletak pada posisi 05°00'N -15°00'S; 115°00' 140°00'E merupakan fishing ground yang baik bagi beberapa jenis tuna dan cakalang. Selama periode tahun 1970 1975 hook rate berbagai jenis tuna, billfish dan spearfish di perairan ini bergerak antara 2,05 2,88% dengan nilai rata-rata - 2,37% per tahun. Nilai hook rate cenderung membesar kearah fishing ground di sebelah timur perairan ini dan kearah katulistiwa. Dibandingkan dengan nilai hook rate tahun 1961 1964 sebesar 3,06% per tahun, hook rate pada tahun 1970 1975 turun sebesar 22,55%, sedang bila dibandingkan dengan nilai hook rate pada tahun 1931 1933 sebesar 8,93% per tahun turun sebesar 73,46% atau turun rata-rata 1,75% per tahun. Hal ini berarti terhadap tuna di perairan ini telah terjadi lebih-tangkap (over exploitation) dan berada pada keadaan yang kritis. Agar perairan ini tetap dapat dieksploitasi secara menguntungkan selama jangka waktu yang panjang, perlu adanya perimbangan antara jumlah kapal yang beroperasi dengan potensi tuna di perairan ini. Jumlah kapal yang dianggap sesuai bagi daerah ini diperkirakan 69 kapal per tahun dari kelas 50 GT atau 43 kapal per tahun dari kelas 100 GT. ...
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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