Judul: Molecular identification of the indian mackerel (Rastrelliger kanagurta) based on COI gene markers in Sunda Strait, Cilacap, and Banyuwangi in supporting fisheries management.
Abstrak: Ikan kembung lelaki (Rastrelliger kanagurta) memiliki nilai ekonomis penting bagi nelayan. Ikan pelagis kecil di WPPNRI 572 dan WPPNRI 573 telah mengalami kondisi fully-exploited. Tekanan eksploitasi yang tinggi akan menurunkan keragaman genetik spesies. Penelitian ini bertujuan untuk memastikan spesies, menganalisis kekerabatan dan keragaman genetik secara molekuler ikan kembung lelaki dengan menggunakan marka gen COI di Perairan Selat Sunda, Cilacap dan Banyuwangi. Isolasi dan ekstraksi DNA menghasilkan 30 DNA total, lalu diamplifikasi dengan metode PCR. Hasil sekuensing divalidasi dengan fitur BLASTn pada aplikasi MEGA 11, menunjukkan bahwa 30 contoh dari ke tiga lokasi merupakan spesies R. kanagurta dengan kemiripan antara 98,15% hingga 100%. Jarak genetik ikan kembung lelaki di tiga lokasi memiliki nilai yang rendah. Hasil pohon filogeni menunjukkan contoh memiliki hubungan kekerabatan yang dekat dan adanya pencampuran populasi dari tiga lokasi, sehingga dapat dikelola dalam satu unit pengelolaan., The Indian Mackerel has important economic value for fishermen. The small pelagic fisheries in WPPNRI 572 and WPPNRI 573 have experienced a fully-exploited condition. High exploitation pressure will reduce the genetic diversity of Indian Mackerel species in the wild. This study aims to determine the species, analyze the molecular kinship and genetic diversity of Indian Mackerel (Rastrelliger kanagurta) using COI gene markers in Sunda Strait waters, Cilacap and Banyuwangi. DNA isolation and extraction yielded 30 total DNA, amplified by the PCR method. Sequencing results were validated with the BLASTn feature on the MEGA 11 application, showing that 30 samples were R. kanagurta species with the highest similarity of 100%. The genetic distance of Indian Mackerel in three locations has a low value. The results of the phylogeny tree show that the sample has a close relationship, and there is a mixing of populations from three locations so that it can be managed in one management unit.
Keyword: COI, genetic, 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: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4