Judul: Dinamika Populasi Ikan Semar (Mene maculata Bloch & Schneider, 1801) di Teluk Palabuhanratu, Sukabumi, Jawa Barat
Abstrak: Ikan semar merupakan salah satu jenis ikan yang dominan tertangkap sekaligus menjadi salah satu produk perikanan yang memiliki nilai ekonomis di Teluk Palabuhanratu. Meningkatnya penangkapan terhadap ikan semar dapat meningkatkan tekanan terhadap sumberdaya dan menimbulkan degradasi populasi ikan semar. Penelitian ini bertujuan untuk menganalisis dinamika populasi (pola pertumbuhan, parameter pertumbuhan, mortalitas, laju eksploitasi, dan ukuran matang gonad) ikan semar (Mene maculata) di Teluk Palabuhanratu, Sukabumi, Jawa Barat. Pengambilan sampel dilakukan pada bulan September 2021 hingga Februari 2022 dengan total ikan semar yang diambil sebanyak 522 ekor. Hasil analisis menunjukkan populasi ikan semar di Teluk Palabuhanratu memiliki kisaran panjang sebesar 112-188 mm dengan proporsi kelamin yang tidak seimbang. Pola pertumbuhan ikan semar adalah alometrik negatif (b<3). Panjang asimtotik ikan semar betina lebih besar dari ikan jantan dengan koefisien pertumbuhan lebih kecil dari ikan jantan. Nilai laju eksploitasi ikan semar melebihi nilai optimum yaitu 0,5. Ikan yang tertangkap umumnya pada ukuran belum matang gonad. Ikan semar mengalami rekrutmen hampir di sepanjang tahun., Moon fish is one of the dominant types of fish caught as well as one of the fishery products that have important economic value in Palabuhanratu Bay. Increased fishing of moon fish can increase pressure on resources and cause degradation of moon fish populations. This study aims to analyze population dynamics (growth patterns, growth, mortality, exploitation rate and gonad maturity size) of moon fish (Mene maculata) in Palabuhanratu Bay, Sukabumi, West Java. Sampling was carried out from September 2021 to February 2022 with a total of 522 moon fish taken. The results showed that the moon population in Palabuhanratu Bay has a length range of 112-188 mm with unbalanced sex proportions. The growth pattern of moon fish is negative allometric (b<3). The asymptotic length of female moon fish is greater than that of male fish with a smaller growth coefficient than that of male fish. The value of the exploitation rate of moon fish exceeds the optimum value of 0.5. Fish caught are generally at the immature size of the gonads. Moon fish undergo recruitment almost all year round.
Keyword: Growth, Moon fish, Palabuhanratu Bay, Population Dynamics

Judul: Status Stock of Moonfish, Mene maculata (Bloch & Schneider, 1801), Based on Spawning Potential Ratio in Palabuhanratu Bay
Abstrak: Ikan semar (Mene maculata) merupakan salah satu tangkapan utama nelayan di Teluk Palabuhanratu dan memiliki nilai ekonomis yang tinggi. Penelitian ini bertujuan untuk menentukan status stok ikan semar di Teluk Palabuhanratu sebagai dasar pengelolaan perikanan yang berkelanjutan. Pengambilan data dilakukan pada bulan September 2021 hingga Februari 2022 dengan ukuran contoh ikan sebanyak 522 ekor. Jumlah ikan semar jantan lebih dominan dibandingkan ikan semar betina. Analisis pertumbuhan dengan metode ELEFAN menghasilkan panjang asimtotik (L∞) dan koefisien pertumbuhan (K) ikan semar jantan memiliki perbedaan dengan ikan semar betina. Analisis mortalitas menduga laju eksploitasi ikan jantan sebesar 0,73 dan betina sebesar 0,62 yang berarti ikan semar mengalami eksploitasi lebih. Analisis rasio potensi pemijahan berdasarkan ukuran panjang (LB-SPR) menunjukkan ikan semar jantan dan betina memiliki nilai SPR di bawah 40% sehingga diduga mengalami tangkap lebih rekrutmen., Moonfish (Mene maculata) is one of the main catches of fishermen in Palabuhanratu Bay and has important economic value. This research aims to determine the status of the moonfish stock in Palabuhanratu Bay as a basis for sustainable fisheries management. Data collected from September 2021 to February 2022 with a sample size of 522 fish. The number of male moonfish exceeded that of females. Growth analysis using the ELEFAN method resulted in different asymptotic length (L∞) and growth coefficient (K) values for male and female moonfish. Mortality analysis estimated that the exploitation rate for male moonfish is 0,73 and female moonfish is 0,62, which means they may be experiencing overfished. The analysis of length based - spawning potential ratio (LB-SPR) indicates that both male and female moonfish have SPR values below 40%, suggesting that they may be experiencing recruitment overfishing.
Keyword: exploitation rate, moonfish, Palabuhanratu Bay, stock status, sustainable fisheries

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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