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: Management of Rabbitfish (Siganus sp.) Fisheries  Resources in the Waters of Mamuju Bay, West Sulawesi
Abstrak: Tingginya intensitas penangkapan ikan baronang di perairan Mamuju dikhawatirkan dapat mengganggu kestabilan dan pertumbuhannya. Hasil analisis spasial interaksi karakteristik habitat membuktikan bahwa lokasi DPI nelayan baronang di perairan Teluk Mamuju merupakan area nursery ground yaitu tutupan karang dan lamun, terutama area pinggir perairan pada kedalaman 1-2 m. Sehingga dominan hasil tangkapan nelayan berukuran juvenil karena merupakan daerah asuhan ikan baronang berukuran muda. Hasil tangkapan ikan baronang yang ditemukan di perairan Teluk Mamuju ada 3 jenis yaitu ikan baronang lingkis (Siganus canaliculatus) dengan nilai Lm 181,3 mm, ikan baronang batik (Siganus vermiculatus) dengan nilai Lm 177,1 mm dan ikan baronang totol (Siganus guttatus) dengan nilai Lm 204,2 cm. Sebaran layak tangkap ikan baronang secara berurutan yaitu 23,49%, 28,09% dan 16,73%. Status pemanfaatan ikan baronang lingkis, batik dan totol secara berurutan memiliki nilai SPR sebesar 19%, 20% dan 9%. Namun, nilai estimasi SPR ini bersifat sementara dikarenakan kualitas data yang diperoleh sangat terbatas sehingga tidak mampu merepresentasikan secara valid stok populasi ikan baronang di lokasi studi sesuai parameter SPR., The high intensity of Siganids fishing in Mamuju waters potentially threatens the sustainability of its stock. The spatial analysis results of the interaction of habitat characteristics indicate that the location of Siganids fishing ground in Mamuju Bay waters is a nursery grounds, namely coral and seagrass beds, particularly an area of 1-2 m water depth. As a consequence, the catches were dominated by juvenile sized Siganids fish. There were three species of baronang fish found in Mamuju Bay waters, namely white-spotted spinefoot (Siganus canaliculatus) with a length at first maturity (Lm) value of 181.3 mm, vermiculated spinefoot (Siganus vermiculatus) with an Lm value of 177.1 mm, and orange-spotted spinefoot (Siganus guttatus) with an Lm value of 204.2 cm. The distribution of biological allowable catch size (> Lm size) of the fishes were 23.49%, 28.09%, and 16.73%, respectively. The stock status of S. canaliculatus, S. vermiculatus, and S. gutatus was unsustainable, as indicated by the Spawning potential ratio (SPR) values of 19%, 20%, and 9%, respectively. However, this SPR estimation value is still an initial indicator because the quantity of available data was limited. Thus, it could not represent the Siganids fish population in the study site according to the SPR parameter.
Keyword: Siganus, Rabbitfish, Fishing Gear, Length at First Maturity

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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