Judul: Spatial and Temporal Behavior of Scad (Decapterus spp. Bleeker, 1851) Production in WPP 712 Based on E-Logbook
Abstrak: Scad is a small pelagic fish that is the main target catch for fishermen in the Java Sea. Continuously increased fishing effort can result in stock depletion. This study aims to analyze the spatial and temporal distribution of scad and its stock status in FMA 712 so that it can be used as a basis for optimal and sustainable management. This study uses secondary data obtained from the e-logbook data of the Fishing Logbook Information System (SILOPI) of the Ministry of Maritime Affairs and Fisheries. The distribution of scad fishing grounds in FMA 712 in 2018-2022 has a movement pattern that tends to be the same yearly. The fishing ground movement pattern moves from the west to the east of the Java Sea from January to May and moves from the east to the west of the Java Sea from August to December. Fishermen dominantly catching scad in the marine waters of Central Java and Kalimantan over the past five years. The value of scad's actual catch and fishing effort in FMA 712 in 2022 is below the MSY and fMSY values, so that based on the e-logbook data the status of scad stock is still underfishing., Ikan layang merupakan ikan pelagis kecil yang dijadikan target tangkapan utama oleh nelayan di Laut Jawa. Meningkatnya upaya penangkapan yang terjadi secara terus-menerus dapat mengakibatkan stock depletion. Penelitian ini bertujuan untuk menganalisis persebaran ikan layang secara spasial dan temporal serta status stok ikan layang di WPP 712 sehingga dapat dijadikan sebagai dasar pengelolaan secara optimal dan berkelanjutan. Penelitian ini menggunakan data sekunder yang diperoleh dari data e-logbook Sistem Informasi Logbook Penangkapan Ikan (SILOPI) Kementerian Kelautan dan Perikanan. Sebaran fishing ground ikan layang di WPP 712 tahun 2018-2022 memiliki pola pergerakan yang cenderung sama setiap tahunnya. Pola pergerakan fishing ground bergerak dari arah barat ke arah timur Laut Jawa mulai bulan Januari hingga Mei dan bergerak dari arah timur ke barat Laut Jawa mulai bulan Agustus hingga Desember. Nelayan dominan menangkap ikan layang di wilayah perairan laut Jawa Tengah dan Kalimantan selama lima tahun terakhir. Nilai hasil tangkapan aktual dan upaya penangkapan aktual ikan layang di WPP 712 tahun 2022 berada di bawah nilai MSY dan fMSY, sehingga berdasarkan data e-logbook status stok ikan layang masih dalam kondisi underfishing
Keyword: ikan layang, daerah penangkapan ikan, stok, WPP 712

Judul: Sustainable Potential of Bigeye Scad (Selar crumenophthalmus Bloch, 1793) in the Java Sea (FMA 712).
Abstrak: WPP 712 memiliki potensi perikanan pelagis kecil yang melimpah terutama pada ikan selar bentong (Selar crumenophthalmus). Ikan selar bentong merupakan ikan dengan nilai ekonomis yang tinggi, sehingga berpotensi mengalami penangkapan berlebih. Penelitian ini bertujuan menentukan status usaha perikanan melalui hasil tangkapan lestari (MSY), upaya optimum (fMSY), dan jumlah tangkapan yang diperbolehkan (JTB) untuk ikan selar bentong (Selar crumenophthalmus Bloch, 1793) di Laut Jawa (WPP 712). Penelitian ini menggunakan data e-logbook penangkapan dari SILOPI. Data tersebut meliputi data produksi hasil tangkapan per tahun, upaya penangkapan, serta lokasi penangkapan ikan selar bentong yang didaratkan di pelabuhan WPP 712 selama tahun 2018 hingga 2022. Data kemudian diolah dengan menganalisis model produksi surplus. Nilai MSY yaitu sebesar 28,59 ton/tahun, sehingga nilai JTB sebesar 22,87 ton/tahun dan nilai fMSY yaitu sebesar 126 trip/tahun. Hasil tangkapan (C) aktual yaitu sebesar 23,15 ton dan upaya penangkapan (f) aktual sebesar 139 trip. Berdasarkan hasil dapat diketahui bahwa nilai MSY > C aktual > JTB dan fMSY < f aktual, sehingga status usaha perikanan selar bentong di Laut Jawa (WPP 712) terindikasi mengalami overfishing., FMA 712 has abundant small pelagic fisheries potential, especially for Bigeye Scad (Selar crumenophthalmus). Bigeye Scad is a fish with a high economic value, which can lead to overfishing. This research aims to determine the status of the fishery through Maximum Sustainable Yield (MSY), optimum effort (fMSY), and Total Allowable Catch (TAC) for Bigeye Scad (Selar crumenophthalmus Bloch, 1793) in the Java Sea (FMA 712). This research used the catch data from e-logbook of the SILOPI. The data included annual catch production, fishing effort, as well as fishing locations for Bigeye Scad landed in the port of FMA 712 during 2018 to 2022. The data was then processed by analyzing surplus production model. The MSY value is 28.59 tons/year, resulting in a JTB value of 22.87 tons/year and an fMSY value of 126 trips/year. The actual catch (C) is 23.15 tons with an actual fishing effort (f) of 139 trips. Therefore, it can be concluded that MSY > actual C > JTB, and fMSY < actual f, indicating that the Bigeye Scad fisheries in the Java Sea (FMA 712) is indicated to be experiencing overfishing.
Keyword: Bigeye Scad, Java Sea, surplus production model, sustainable potential

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell