Judul: Reef Fish Community Structure in Different Conservation Zones in the Eastern Seram Islands
Abstrak: Penetapan Kawasan Konservasi dapat mencegah hal tersebut yang diakibatkan oleh aktivitas manusia. Kegiatan aktivitas yang dilakukan pada zona perikanan tangkap dan budidaya perikanan di Kawasan Konservasi Perairan dapat menyebabkan adanya ancaman kerusakan yang dialami oleh ekosistem terumbu karang. Penelitian ini bertujuan untuk mengkaji struktur komunitas ikan karang dan kaitannya dengan zonasi pengelolaan konservasi di Kepulauan Seram Bagian Timur. Penelitian dilakukan pada tanggal 30 September – 7 Oktober 2023 di Kawasan Konservasi Perairan Seram Bagian Timur. Pengambilan data karang dan ikan menggunakan metode underwater visual census dengan pencatatan ikan yang berada di dalam transek. Ikan karang yang paling banyak ditemukan pada Zona Inti dan Zona Budidaya adalah famili Caesionidae, sedangkan pada Zona Perikanan adalah famili Pomacentridae. Terlihat perbedaan yang signifikan antara kelimpahan pada setiap zonasi. Struktur komunitas ikan karang di memiliki keanekaragaman sedang, sebaran taksa yang merata dan tidak terjadi dominansi., Establishing Conservation Areas can prevent these things caused by human activities. Activities carried out in capture fisheries and aquaculture zones in Marine Protected Areas can pose a threat of damage to coral reef ecosystems. This research aims to examine the structure of coral fish communities and their relationship with conservation management zoning in the Eastern Seram Islands. The research was carried out on 30 September – 7 October 2023 in the Eastern Seram Marine Conservation Area. Coral and fish data collection uses the underwater visual census method by recording fish on transects. The coral fish most commonly found in the Core Zone and Cultivation Zone are the Caesionidae family, while in the Fishery Zone they are the Pomacentridae family. There were significant differences between abundance in each zone. The structure of the reef fish community has moderate diversity, an even distribution of taxa and no dominance.
Keyword: ikan karang, reef fish

Judul: Detection of Reef Fish Communities Using  Environmental DNA in the Core Zone Area of Seribu Islands National Park
Abstrak: Ikan merupakan taksa terbesar dari hewan vertebrata yang bersimbiosis dengan terumbu karang. Ikan terumbu memegang peranan penting sebagai grazer yang mengontrol pertumbuhan alga, mempunyai nilai ekonomis penting dalam bidang perikanan, dan sebagai daya tarik bagi para wisatawan. Penelitian ini bertujuan mengetahui struktur komunitas ikan terumbu di kawasan Zona Inti Taman Nasional Kepulauan Seribu menggunakan DNA lingkungan (eDNA). Metode eDNA telah berkembang dan banyak digunakan dalam pemantauan keanekaragaman hayati laut. Penelitian ini berhasil mendeteksi ~40.081 paired-end sekuens dari empat lokasi penelitian. Sebanyak 46 spesies dari 33 genus teridentifikasi sebagai ikan terumbu. Penelitian ini berhasil mendeteksi kelompok ikan mayor dan target, namun ikan indikator tidak terdeteksi. Ikan carnivore mendominasi di seluruh lokasi penelitian sedangkan ikan herbivore paling sedikit ditemukan di penelitian ini. Lokasi penelitian memiliki nilai indeks keanekaragaman yang sedang, keseragaman yang tinggi, dan dominansi yang rendah., Fish are the largest group of vertebrate animals that live alongside coral reefs. They are essential in coral reef ecosystems, as they graze on algae, have economic value in fisheries, as well as being attractions for tourists. This study aims to determine the community structure of reef fish in the Core Zone Area of Seribu Islands National Park using the Environmental DNA (eDNA) method. The eDNA method has evolved and is widely employed in monitoring marine biodiversity. This study detected ~40,081 paired-end read sequences from four study sites. A total of 46 species from 33 genera were identified as reef fish. The highest species and family richness were found in East Peteloran, with 23 species from 14 reef fish families. This study successfully identified major and target fish groups but did not find any indicator groups. Carnivorous fish dominated all study sites, while herbivorous fish were least found in this study. The study sites showed moderate diversity, high evenness, and low dominance.
Keyword: Community structure, Environmental DNA, Diversity, Reef Fish

Judul: Sintesis BaTiO3 dari BaCl2 dan TiCl4 dengan Metode Hidrotermal
Abstrak: Increasing technology has lead to proliferating electronic equipments. One component of electronic equipment is capacitor, which can be made of barium titanate (BaTiO3). This study aims to synthesize and to characterize BaTiO3 from a mixture of BaCl2 and TiCl4 by observing changes in temperature and the stage of the reaction. This study was carried out in several stages, i.e synthesis of BaTiO3 by hydrothermal method, changes in the reaction steps, changes in pH, compared the results by nonhydrothermal method and characterization by X-ray diffraction (XRD). Based on XRD results, synthesis of BaTiO3, using the method of hydrothermal (T = 120-150 °C), changes in the reaction steps, also in pH, had not been able to produced pure BaTiO3. It can be seen from low intensity of BaTiO3 and presence of other impurities in the form of TiO2 as can be found in all methods including non-hydrothermal method (T = 600 °C).
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