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: Reproductive Biology of Moonfish (Mene maculalata Bloch & Schneider, 1801) in Palabuhanratu during West Monsoon
Abstrak: Ikan semar (Mene maculata) merupakan ikan demersal dengan nilai ekologis dan ekonomis yang penting. Tingginya pemanfaatan ikan semar sebagai ikan konsumsi berpotensi mengganggu pola reproduksi, rekrutmen dan ketersediaan stok sumberdaya ikan semar, yang mana informasi biologi reproduksi minim pada musim barat. Oleh karena itu, penelitian ini bertujuan untuk menganalisis biologi reproduksi ikan semar di Teluk Palabuhanratu. Periode penelitian berlangsung pada bulan September 2021 hingga Februari 2022 (mewakili musim barat), dengan ikan contoh sebanyak 522 ekor. Pengambilan ikan contoh menggunakan metode penarikan contoh acak sederhana. Hasil menunjukkan bahwa nisbah kelamin sebesar 1:0,76 yang didominasi oleh ikan jantan. Ikan semar memiliki pola pertumbuhan allometrik negatif. Puncak musim pemijahan selama periode penelitian berada di bulan September dan Oktober. Potensi reproduksi berkisar 11.988 hingga 21.164 butir telur. Pola pemijahan ikan semar terindikasi total spawner yaitu pemijahan yang terjadi secara sekaligus. Hasil analisis menggunakan metode Spearman-Karber menunjukkan bahwa ukuran pertama kali ikan semar betina matang gonad (Lm) lebih dahulu dibanding ikan semar jantan., Moonfish (Mene maculata) is a demersal fish with important ecological and economic values. The high utilization of semar fish as consumption fish has the potential to disrupt reproductive patterns, recruitment and the availability of moonfish resource stocks, where an information on reproductive biology is minimal during the west monsoon. This study aims to analyze the reproductive biology of moonfish in Palabuhanratu Bay. This research was conducted from September 2021 to February 2022 (representing the west moonson), with a sample of 522 fish. Sampling of fish using simple random sampling method. The results show that the sex ratio is 1:0.76 which is dominated by male fish. Moonfish has a negative allometric growth pattern. Spawning season during the study period was in September and October. The reproductive potential ranges from 11.988 to 21.164 eggs. Moonfish spawning patterns indicated total spawners, namely spawning that occurred all at once. The results of the analysis using the Spearman-Karber method showed that femmale’s moonfish reaches the size at first sexual maturity (Lm) is earlier than males.
Keyword: Moonfish, Palabuhanratu bay, Reproductive biology

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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