Judul: Dinamika Populasi Sumberdaya Ikan Swanggi (Priacanthus tayenus, Richardson 1846) di Perairan Selat Sunda.
Abstrak: Priacanthus tayenus (Richardson 1846) is one of economic important demersal fish originally distributed in Sunda Strait. The fish has long been exploited; however, present stock status has not yet been assess. Therefore, in order to prevent overexploitation, its stock should be well studied. This study was aim at assessing reproduction biology and population dynamic of Purple-spotted bigeye (Priacanthus tayenus) in the Sunda Strait landed in Labuan Beach Fishing Port, Banten province. This study covered some aspects of reproduction, growth, and the rate of exploitation. Spawning time Purple-spotted bigeye was commenced in June to October. Size at first maturity in respect to female and male was 127,67 mm and 268,78 mm. Exploitation rates of female and male individuals were 71% and 64%, respectively. It is concluded that purple-spotted bigeye in Sunda Strait is overexploited.
Keyword: Growth, PPP Labuan, Purple-spotted bigeye, Rate of exploitation, Stock assessment

Judul: Dinamika Pertumbuhan dan Laju Eksploitasi Ikan Swanggi (Priacanthus tayenus Richardson, 1846) di Perairan Selat Sunda.
Abstrak: Ikan swanggi (Priacanthus tayenus Richardson, 1846) merupakan ikan demersal yang memiliki nilai ekonomis penting dan nilai ekologis. Penelitian ini bertujuan untuk mengkaji dinamika pertumbuhan dan laju eksploitasi ikan swanggi. Aspek yang dikaji meliputi hubungan panjang-bobot, rasio kelamin, sebaran frekuensi panjang, identifikasi kelompok umur, parameter pertumbuhan, mortalitas, dan laju eksploitasi. Jumlah total ikan yang diamati sebanyak 919 ekor dengan panjang ikan berkisar antara 105–329 mm. Ikan swanggi mengikuti pola pertumbuhan allometrik negatif (α = 0,05). Jumlah ikan jantan dan betina di perairan berada dalam keadaan tidak seimbang dengan rasio 1:1,6. Ukuran pertama kali matang gonad (Lm) ikan jantan dan betina sebesar 253,60 dan 194,40 mm, sedangkan ukuran pertama kali tertangkap (Lc) ikan jantan dan betina adalah 238,13 dan 181,66 mm. Panjang asymptotic (L∞) ikan swanggi jantan dan betina adalah 361,22 dan 376,45 mm. Koefisien pertumbuhan ikan swanggi jantan adalah 0,49 dan ikan swanggi betina 0,38. Laju eksploitasi ikan swanggi, baik jantan maupun betina telah mengalami tangkap lebih.
Keyword: ikan swanggi, laju eksploitasi, perairan Selat Sunda, pertumbuhan, PPP Labuan

Judul: Detoxification of Cassava’s Acid Hydrolyzate by Activated Carbon Method for Bioethanol Production
Abstrak: Cassava is one of natural resources for carbohydrate that also available for bioethanol production. Starch and fibers hydrolysis maybe conducted on acid condition. The restriction in acid hydrolysis is 5-hydroxymethyl furfural (HMF) and furfural formation, which inhibit yeast fermentation. This study applied two stages of detoxification, which are overliming and activated carbon adsorption methods for lowering HMF and furfural concentrations. In order to obtain tolerable amount in sugar solution, detoxification by activated carbon adsorption was done by concentration of 1%, 2.5%, 5% and 10% and duration of contact are 30 45 and 60 minutes. The results showed that overliming method decreased HMF and furfural concentrations 34.38% and 60.81%, respectively. Overliming followed by 5% activated carbon adsorption for 30 minutes produced the best sugar solution which has a lower HMF and furfural concentrations by 72.03% and 89.11%, respectively. Adsorption constants of HMF and furfural by 5% activated carbon were 0.044 g/min and 3,7 x 10-5 g/min, respectively. The concentration of ethanol produced was 5.00% (b/v) or 63.22% higher than obtained from detoxification by neutralization (NH4OH) which produced ethanol only 3.06%.
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