Judul: Molecular identification of the indian mackerel (Rastrelliger  kanagurta) based on 16S rRNA gene markers in FMA NRI 572 and 573 as a basis  for fisheries management
Abstrak: Ikan kembung lelaki (Rastrelliger kanagurta) memiliki nilai ekonomis penting bagi nelayan. Ikan pelagis kecil di WPP-NRI 572 dan WPP-NRI 573 telah mengalami kondisi fully-exploited. Penelitian ini bertujuan memastikan spesies, keragaman genetik dan kekerabatan spesies secara molekuler ikan kembung lelaki (Rastrelliger kanagurta) berdasarkan marka gen 16S rRNA di WPP-NRI 572 dan 573 sebagai dasar pengelolaan perikanan. Penelitian dilakukan pada bulan Juni 2021 hingga Januari 2022. Sampel ikan diambil dari perairan Labuan, Cilacap, dan Banyuwangi dengan jumlah total sebanyak 9 individu. Urutan basa nukleotida hasil sekuensing dianalisis menggunakan software MEGA X. Hasil identifikasi DNA barcoding, menunjukkan spesies ikan kembung dari tiga lokasi berbeda merupakan ikan kembung lelaki (Rastrelliger kanagurta). Nilai keragaman genetik ikan kembung lelaki dari tiga lokasi termasuk dalam kategori tinggi. Hal ini menunjukkan populasi ikan kembung tergolong stok yang baik, The Indian Mackerel has important economic value for fishermen. The small pelagic fisheries in WPP-NRI 572 and WPP-NRI 573 have experienced a fully-exploited condition. This study aims to determine species certainty, genetic diversity and genetic relationships of indian mackerel (Rastrelliger kanagurta) molecularly based on 16S rRNA gene markers in WPP-NRI 572 and 573 as a basis for fisheries management. The research was conducted from June 2021 to January 2022. Fish samples taken from the waters of Labuan, Cilacap, and Banyuwangi with a total of 9 individuals. The nucleotide base sequences of the sequencing results were analyzed using MEGA X software. The identification results of DNA barcoding showed that the mackerel species studied from three different locations were the Indian Mackerel (Rastrelliger kanagurta). The results showed that the genetic diversity value of male mackerel from three locations was included in the high category indicating that the mackerel population was classified as a good stock.
Keyword: 16S rRNA genes, genetic diversity, Rastrelliger kanagurta

Judul: Keragaman Morfometrik Ikan Kembung Lelaki Rastrelliger kanagurta (Cuvier, 1816) di WPP-NRI 572 dan 573 Untuk Pengelolaan Perikanan
Abstrak: Ikan kembung lelaki (Rastrelliger kanagurta) merupakan salah satu spesies ikan yang banyak dimanfaatkan oleh masyarakat khususnya di WPP-NRI 572 dan 573 sehingga perlu adanya pengetahuan unit stok sebagai dasar pengelolaan. Penelitian ini bertujuan untuk menganalisis keragaman karakter morfometrik ikan kembung lelaki R. kanagurta (Cuvier, 1816) di perairan Labuan (WPP-NRI 572) Cilacap, dan Banyuwangi (WPP-NRI 573) guna mengetahui variasi unit stok atau sub-populasi. Hubungan panjang bobot ikan kembung lelaki yang berasal dari Labuan dan Banyuwangi memiliki pola pertumbuhan alometrik positif, sedangkan ikan kembung lelaki dari Cilacap memiliki pola pertumbuhan alometrik negatif. Perbandingan karakter morfometrik pada metode baku dan Truss Network Analysis menunjukkan adanya perbedaan karakter morfometrik. Analisis tingkat kemiripan menunjukkan populasi yang berasal dari Banyuwangi terpisah dari lokasi lainnya. Analisis pengklasifikasian karakter morfometrik dengan metode baku menunjukkan percampuran populasi dari ketiga lokasi, namun dengan Truss Network Analysis hanya dari Banyuwangi yang terpisah. Adanya keragaman karakter morfometrik ikan kembung lelaki di WPP-NRI 572 dan 573 dapat diduga berpotensi lebih dari satu unit stok khususnya di WPP-NRI 573, sehingga perlu dilakukan pengelolaan perikanan yang sama di Labuan (WPP-NRI 572) dengan Cilacap (WPP-NRI 573) dan berbeda dengan Banyuwangi., Indian mackerel (Rastrelliger kanagurta) is one of the fish species that is widely used by the community, especially in FMA-RI 572 and 573 so it is necessary to have knowledge of stock units as a base for management. This research aims to analyze the diversity of morphometric characters of Indian mackerel R. kanagurta (Cuvier, 1816) in Labuan waters (FMA-RI 572), Cilacap and Banyuwangi (FMA-RI 573) to determine variations in stock units or sub-populations. The length-weight relationship of Indian mackerel from Labuan and Banyuwangi had positive allometric growth pattern, while Indian mackerel from Cilacap had negative allometric growth pattern. Comparison of morphometric characters in conventional and Truss Network Analysis methods showed there are some differences in morphometric characters. The analysis of similarity level showed population from Banyuwangi was separate from other locations. The analysis of morphometric character classification with standard method showed populations of the three locations were mixed, but with Truss Network Analysis only from Banyuwangi were separated. The diversity of Indian mackerel morphometric characters in FMA-RI 572 and 573 can be assumed to be potentially more than one stock unit especially in FMA-RI 573, so it is necessary to do the same fisheries management in Labuan (FMA-RI 572) with Cilacap (FMA-RI573) and different from Banyuwangi.
Keyword: Indian mackerel (R. kanagurta), morphometric, stock unit

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition