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: Teknik Penangkapan dan Ukuran Layak Tangkap Ikan Baronang (Siganidae) di Perairan Pulau Harapan, Kepulauan Seribu.
Abstrak: Aktivitas penangkapan ikan baronang yang semakin tinggi pada perairan Pulau Harapan, Kepulauan Seribu dapat menimbulkan overfishing. Hal ini dapat ditandai dengan perubahan struktur populasi sumberdaya ikan, ukuran dan jumlah hasil tangkapan. Penelitian ini bertujuan mendeskripsikan teknik penangkapan ikan baronang yang berbasis di Pulau Harapan, Kepulauan Seribu; mengestimasi parameter pertumbuhan dan ukuran pertama kali matang gonad sebagai indikator ukuran layak tangkap ikan baronang di lokasi studi; dan mengevaluasi dampak penangkapan terhadap keseimbangan rantai makanan (tingkat trofik) sumberdaya ikan di lokasi studi. Hasil penelitian menunjukkan bahwa nelayan Pulau Harapan menggunakan tiga jenis alat tangkap yaitu bubu tali, bubu tambun, dan senapan tembak. Ikan baronang yang tertangkap yaitu baronang kalung (Siganus virgatus), baronang tompel (S. punctatus), baronang garis (S. javus), baronang totol (S. guttatus), dan baronang lingkis (S. canaliculatus). Ukuran layak tangkap berdasarkan parameter length at first maturity (Lm) dan porsi layak tangkap masing-masing jenis ikan baronang tersebut berdasarkan penelitian ini adalah: ikan baronang kalung (Lm = 13,5 cm dan 100% layak tangkap), baronang tompel (Lm = 22,8 cm dan 65,51% layak tangkap), baronang garis (Lm = 30,6 cm dan 4% layak tangkap), baronang totol (Lm = 21,2 cm dan 100% layak tangkap) dan baronang lingkis (Lm = 20,8 cm dan 100% layak tangkap). Hasil tangkapan didominasi oleh jenis ikan kelompok omnivora yang cenderung pemakan hewan atau kelompok trophic level 3. Penelitian ini menyimpulkan bahwa walaupun hasil tangkapan ikan target baronang sebagian besar layak tangkap, namun secara ekologis berdampak terhadap fungsi ekosistem (keseimbangan rantai makananan).
Keyword: dampak penangkapan, ikan baronang, Siganidae, trofik level, ukuran layak tangkap

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