Judul: Diversity of Biometric, Genetik and Population Biology of White-spotted rabbitfish (Siganus canaliculatus Park, 1798) in the Inner Ambon Bay Waters
Abstrak: The waters of Inner Ambon Bay (IAB) are influenced by tidal currents that distribute food, physical dan chemical environmental parameters, waste, sediment, and larvae of fish. One of the fish resources associated with seagrass habitats in TAD waters is White-sptotted rabbitfish (Siganus canaliculatus). Seagrass habitat is widely distributed in IAB which form single and mixed vegetation seagrass beds, with different vegetation densities and their presence is influenced by environmental parameters, substrate type/sediment and anthropogenic activity. The differences in the physical characteristics of the seagrass habitat in IAB are thought to affect the character biometric, genetic, and population biological of S. canaliculatus in IAB. This study aims to compare 1) biometric character, 2) genetic character, 3) spatial distribution, 4) variation of growth and reproduction in different seagrass habitats, and 5) to analyze population dynamics of S. canaliculatus in IAB waters. Research in IAB waters was conducted in August 2018 - July 2019, the sampling stations namely Station 1. (Tanjung Tiram) and 2 (Halong) represent mixed vegetation seagrass habitat, Station 3 (Poka) and 4 (Nania) represents a single vegetation seagrass habitat. Fish samples were collected once a month using beach seine, along with the measurement of enivonmental parameters, including depth, turbidity, temperature, salinity, pH, dissolved oxygen, phosphate, nitrate, and chlorophyll-a. The density and diversity of seagrass vegetation were estimated based on a systematic sampling method. Observations of biometric characters, gonad maturity levels, and fecundity were carried out at the Oceanographic Biology Laboratory, Center for Deep Sea Research - LIPI Ambon. Genetic testing was carried out at the Molecular Biology Laboratory of the Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, IPB University. The collected fish samples were classified into 3 stages, namely: juvenile, pre-adult, and adult. A total of 50 fish samples were measured 21 characters truss morphometric, and 14 fish samples were genetically tested using the mitochondrial cytochrome oxidase I (COI) molecular marker amplified by the Polymerase Chain Reaction (PCR) technique using universal primers for aquatic biota. All good quality PCR products are shipped to 1st Base in Malaysia. Fish samples were also measured for length, weighed, and dissected for determination of the gonad maturity levels morphologically and fecundity observations. Biometric analysis using Minitab ver. 16 for Principal component analysis (PCA) and similarity dendrogram, while discriminant canonical analysis using SPSS ver. 16. Sequencing data were corrected and aligned using MEGA (Molecular Evolutionary Genetics Analysis) software version 7.0. DNA Sequence Polymorphism (DnaSP ver 5) was used to analyze genetic diversity including haplotype diversity (Hd) and nucleotide diversity (π). Phylogeny tree construction based on the Neighbor-Joining method and genetic distance using MEGA ver. 7. Genetic differentiation intra and inter population using Analysis of Molecular Variance (AMOVA) and Fixation Index (Fst) using Arlequin software. Analysis of growth patterns, condition factors, sex ratios, size of gonad maturity, and fecundity using Excel 2010 software. processed using Past ver.3.14 software. Analysis of fish population dynamics using ELEFAN (Electronic Frequency Analysis) I FiSAT model (FAO-ICLARM Stock Assessment Tools) includes growth, mortality, and recruitment. The results showed that the biometric character of White-spotted Rabbitfish (S. canaliculatus) in IAB
Keyword: Siganus canaliculatus, biometric and genetic characteristics, spatial distribution, growth, reproduction, population dynamics

Judul: Rabbitfish (Siganus sp.) Utilization Status in Karimunjawa Waters
Abstrak: Perairan Karimunjawa memiliki potensi perikanan tangkap yang tinggi, baik sumberdaya ikan pelagis maupun karang. Ikan baronang (Siganus sp.) merupakan ikan karang dengan nilai ekonomis penting. Tingginya permintaan konsumsi ikan baronang melatarbelakangi peningkatan operasi penangkapan ikan. Informasi biologi dan status pemanfaatan ikan baronang diperlukan untuk mendukung pengelolaan perikanan berkelanjutan. Tujuan penelitian untuk mendeskripsikan unit penangkapan dan status pemanfaatan sumberdaya ikan baronang serta membandingkan tren status pemanfaatan ikan baronang dalam rentang waktu 2014-2020. Penelitian ini menggunakan data monitoring dari Wildlife Conservation Society (WCS) berupa data panjang ikan baronang. Data yang digunakan sebanyak 2625 ekor ikan baronang dari dua spesies dominan yakni Siganus javus dan Siganus punctatus. Metode pendekatan LB-SPR (Length-based Spawning Potential Ratio) digunakan dalam penelitian ini. Hasil penelitian menunjukkan bahwa unit penangkapan dominan adalah panah dan bubu. Siganus punctatus memiliki nilai SL50 (29,08) < Lm (30) sedangkan Siganus javus memiliki nilai SL50 (27,13) > Lm (23). Siganus punctatus berada dalam status pemanfaatan fully moderately dengan nilai SPR sebesar 33% sedangkan spesies Siganus javus berada dalam status pemanfaatan over exploited dengan nilai SPR sebesar 12%. Oleh karena itu, pengendalian terhadap jumlah tangkapan dan ukuran tangkapan perlu diperhatikan, baik dalam musim penangkapan ataupun musim pemijahan, sehingga terciptanya pengelolaan perikanan baronang yang bertanggung jawab dan berkelanjutan., Karimunjawa waters have potentially captured fisheries resources, pelagic and coral fishes. Rabbitfish (Siganus sp.) is a reef fish with significant economic value. The high demand for the consumption of rabbitfish is the background to the increase in fishing operations. Information on the biology and utilization status of rabbitfish is needed to support sustainable fisheries management. The study aimed to describe the fishing units and utilization status of rabbitfish resources and to compare trends in rabbitfish utilization status in the 2014-2020 time frame. This study used monitoring data from the Wildlife Conservation Society (WCS) in the form of rabbitfish length data. The data used were 2625 rabbitfish from two dominant species, Siganus javus, and Siganus punctatus. The LB-SPR (Length-based Spawning Potential Ratio) approach method was used in this study. The results showed that the dominant fishing units were arrows and traps. Siganus punctatus has a value of SL50 (29.08) < Lm (30), while Siganus javus has a value of SL50 (27.13) > Lm (23). Siganus punctatus is in a moderately utilized status with an SPR value of 33%, while the Siganus javus species is in an over-exploited utilization status with an SPR value of 12%. Therefore, it is necessary to pay attention to controlling the number of catches and the size of the catch, both during the fishing and spawning seasons, to create responsible and sustainable management of the rabbitfish fisheries.
Keyword: length at first maturity, Karimunjawa waters, Siganus javus, Siganus  punctatus, length-based spawning potential ratio

Judul: Kinerja model pengering bangunan tembus cahaya dari plastik tahan UV untuk pengeringan buah kopi
Abstrak: Kopi merupakan komoditas ekspor yang memerlukan pengeringan sebelum dikonsumsi, sehingga kemampuannya dapat disimpan dalam waktu lama sangat menentukan mutu dan nilai ekonominya. Penyediaan sarana pengeringan yang memadai sangat dibutuhkan untuk mencapai tujuan tersebut. Sebuah model bangunan tembus cahaya untuk pengeringan kopi skala 1.5 ton sudah dirancang dan diuji coba. Bangunan tersebut berukuran 6 m x3 m, tinggi 2.46 m terbagi menjadi dua. yaitu atap 0.56 m dengan sudut kemiringan 32.4" dan dinding 1.9 m membentuk sudut kemiringan 85.6" terhadap lantai. Plastik tahan UV menutupi atap dan dindingnya. Penelitian ini bertujuan menguji kinerja model pengering bangunan tembus cahaya pada kapasitas maksimum. Percobaan dilakukan dengan mengeringkan kopi pada ketebalan 30 cm dan 40 cm (kapasitas penuh) dibantu blower 0.5 11P, 220 volt untuk mengalirkan udara pengering di dalam bangunan tembus cahaya dan mengeluarkan uap air bahan yang telah diuapkan dari bangunan tersebut. Hasil percobaan memperlihatkan bahwa penutup transparan mampu memanfaatkan 70% radiasi matahari yang jatuh di permukaannya. Pada kondisi radiasi termanfaatkan rata-rata sebesar 435.1 W/m². laju aliran udara sebesar 2520...
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