Judul: Target Strength Measurement of Snakehead Fish (Channa striata Bloch 1793) Juveniles Using Hydroacoustic Method under Controlled Conditions
Abstrak: Ikan Gabus (Channa striata) merupakan ikan karnivora yang banyak ditangkap karena rasa dagingnya yang gurih dan mudah ditemukan di perairan berlumpur, rawa-rawa, kolam, perairan sungai. Ikan gabus anakan lebih banyak ditangkap sebagai pakan untuk ikan hias lainnya, ancaman terhadap anakan gabus secara terus menerus dapat berakhir dengan kepunahan. Hal ini menjadi penting untuk menganalisa hubungan antara Target strength (TS) dengan panjang total anakan ikan gabus menggunakan instrumen echosounder SIMRAD EK15. Pengolahan data target strength 15 ikan gabus dengan rentang panjang badan 10-15 cm dilakukan dalam perangkat lunak echoview versi demo menggunakan metode digitasi per 1 ping dengan thresholding diantara -70 dB hingga -30 dB. Nilai TS yang diperoleh memiliki rata-rata -46.80 dB sampai -45.01 dB. Analisis hubungan antara panjang total dan nilai TS anakan ikan gabus memiliki hubungan yang sangat kuat yang ditunjukkan oleh koefisien regresi sebesar 85.31% dan persamaan TS= 64.439ln(L) – 215.66., Snakehead fish (Channa striata) is a carnivorous fish that is widely caught for the savory meat taste and easy to found in muddy waters, swamps, ponds, river waters. Snakehead fish juveniles are mostly caught as food for other ornamental fish, Threats that continuously run over the snakehead fish’s juveniles might makes them end up in extinction. It’s become important to analyse the relationship between Target Strength (TS) and the total length of snakehead fish’s juveniles using SIMRAD EK 15 echosounder. The target strength data of 15 snakehead fish with body length range of 10-15 cm is processed using the demo version of echoview by digitizing each ping and applying threshold between -70dB to -30dB. Results of the average value of TS ranged from -46.80 dB to -45.01 dB. The relationship between total length and TS value of snakehead fish has a strong relationship, which is indicated by regression coefficient of 85.31% and the equation TS = 64,439ln(L) – 215.66
Keyword: hydroacoustic, juvenile, SIMRAD EK 15, snakehead fish, target strength

Judul: Effectiveness of Recombinant Giant Grouper  Growth Hormone Through Oral on Growth of Snakehead Fish Juvenile Channa striata
Abstrak: Ikan gabus (Channa striata) merupakan spesies potensial untuk dibudidayakan, namun masa pemeliharaannya cukup lama sekitar 8 bulan dan harga pakan berprotein tinggi menjadi kendala dalam proses budidayanya. Tujuan penelitian ini yaitu menguji efektivitas pemberian recombinant Epinephelus lanceolatus growth hormone (rElGH) melalui pakan buatan terhadap pertumbuhan benih ikan gabus. Penelitian terdiri atas dua perlakuan, yaitu penambahan rElGH pada pakan dengan dosis 5 mg/kg pakan dan tanpa penambahan rElGH pada pakan, dengan empat kali ulangan setiap perlakuan. Benih ikan gabus dengan rata-rata panjang 4,29±0,12 cm; bobot 0,54±0,05 g dipelihara dalam hapa berukuran 1,0 x 1,0 x 1,0 m3 dengan padat tebar 30 ekor per hapa. Pemeliharaan dilakukan selama 60 hari dengan pemberian pakan mengandung rElGH dilakukan hanya satu minggu pertama secara at satiation. Parameter yang diamati yaitu bobot akhir, panjang akhir, pertumbuhan mutlak, pertumbuhan spesifik, laju pertumbuhan harian, rasio konversi pakan dan tingkat kelangsungan hidup. Hasil penelitian menunjukkan pertambahan bobot dan panjang akhir benih ikan gabus yang diberi perlakuan rElGH berturut-turut meningkat 64,6% dan 18,6% lebih tinggi dibandingkan perlakuan kontrol dan rasio konversi pakan menurun 36,4% dibandingkan perlakuan kontrol. Pemberian hormon rElGH efektif meningkatkan kinerja pertumbuhan benih ikan gabus., Snakehead fish (Channa striata) is potential species for cultivation, but the culture period is quite long, around 8 months and the price of high protein feed is an obstacle in the cultivation process. The purpose of this study is to examine the effectiveness of recombinant Epinephelus lanceolatus growth hormone (rElGH) through oral on growth of snakehead fish juvenile. The study consisted of two treatments, the addition of rElGH to feed with 5 mg/kg feed dose and without the addition of rElGH, repeated four times every treatment. Fish with average length 4.29±0.12 cm; weight 0.54±0.05 g are preserved in a hapa measuring 1,0 x 1,0 x 1,0 m3 with fish density of 30 in each net hapa. Fish rearing carried out for 60 days and given feed containing rElGH only in the first week in at satiation method. Parameters observed were final weight, final length, absolute growth, specific growth, daily growth rate, feed conversion ratio and survival rate. The results show weight and final length treated with rElGH respectively by 64.6% and 18.6% higher than the control treatment and feed conversion ratio decreased 36.4% compared to the control treatment. The application of rElGH can be useful to increase growth of snakehead fish juvenile.
Keyword: Channa striata, Feed, Growth rate, rGH

Judul: Prenilasi Senyawa β-Diketon sebagai Prekursor 3-Prenilflavon
Abstrak: One group of flavonoids that has not been commonly synthesized is 3- prenylflavone. The main objective of this experiment was to synthesize precursor of 3-prenylflavone. Firstly, β-diketone was synthesized via 4 steps from phenol as starting compound with total yield of 24%. Prenylation of β-diketone with prenyl bromide and K2CO3 base produced 4 fractions which were separated by using preparative thin layer chromatography (PTLC) with n-hexane:EtOAc (8:2) as the eluent. Fraction with Rf = 0.80 was further separated by using preparative PTLC with n-hexane:EtOAc (99:1) as the eluent. Two fractions were obtained with Rf = 0.38 and 0.42. The first fraction has been characterized as diprenylated β-diketone with 49% yield. Application of protecting group on the phenolic OH group in β- diketone are needed to obtain monoprenylated β-diketone which can be further cyclized into 3-prenylflavone
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