Judul: Analysis of Morphometric Characters and Habitat of Blue Swimming Crab (Portunus pelagicus Linnaeus, 1758) in Pamekasan Regency, Madura
Abstrak: Rajungan (Portunus pelagicus Linnaeus, 1758) termasuk dalam sumberdaya laut penting dan bernilai ekonomis tinggi. Kondisi habitat alami yang menurun dapat menyebabkan rajungan stress, terkena penyakit, sehingga kematian. Perlu adanya analisis karakter morfometrik dan habitat rajungan pada Kabupaten Pamekasan, Madura. Penelitian dilaksanakan selama tiga kali sampling yaitu Agustus 2022, Oktober 2022, dan Januari 2023. Hasil menunjukkan rajungan yang tertangkap memiliki distribusi lebar karapas pada 62,5-152,5 mm. Rajungan jantan memiliki pola pertumbuhan allometrik, sedangkan rajungan betina memiliki pola pertumbuhan isometrik. Nilai slope pada ANCOVA menunjukkan laju pertumbuhan lebar karapas dan panjang karapas tiap bulan sama/tidak memiliki perbedaan nyata (p>0,05). Analisis Kruskal Wallis menunjukkan sebagian besar karakter morfometrik rajungan tiap bulan berbeda nyata (p<0,05). Analisis diskriminan menunjukkan persebaran karakter morfometrik tiap bulan tidak berbeda jauh dan berhubungan erat. Sebagian besar parameter fisika kimia telah memenuhi baku mutu serta tiap parameter saling memiliki korelasi. Komposisi bycatch yang tertangkap sebesar 45,60% dan didominasi famili Portunidae., Blue swimming crab (Portunus pelagicus Linnaeus, 1758) is an important marine resource and has high economic value. Decreasing natural habitat conditions can cause crab stress, disease, and even death. There is a need to analyze the morphometric characters and habitat of blue crabs in Pamekasan Regency, Madura. The research was carried out with three sampling sessions in August 2022, October 2022, and January 2023. The results showed that the crabs caught had a carapace width distribution of 62.5-152.5 mm. Male crabs have an allometric growth pattern, while female crabs have an isometric growth pattern. The slope value in ANCOVA shows that the growth rate of carapace width and carapace length each month is the same/no significant difference (p>0.05). Kruskal Wallis analysis showed that most of the crab morphometric characters were significantly different each month (p<0.05). Discriminant analysis showed that the distribution of morphometric characters for each month is not much different and is closely related. Most of the physicochemical parameters have met quality standards and each parameter has a correlation with each other. The composition of bycatch caught was 45.60% and was dominated by the Portunidae family.
Keyword: morphomertric characters, habitat characteristic, blue swimming crab, Pamekasan, physicochemical parameters, bycatch

Judul: Morphometric diversity of blue swimming crab Portunus  pelagicus (Linneaus 1758) in water of Sunda Strait and South of Java for  Fisheries Management Purpose
Abstrak: Rajungan hidup di perairan pesisir dengan substrat berpasir atau berlumpur. Perbedaan lingkungan perairan dan intensitas penangkapan mempengaruhi keragaman karakter morfometrik sebagai bentuk adaptasi dan mencirikan unit stok. Tujuan penelitian ini adalah untuk menganalisis keragaman morfometrik rajungan di Selat Sunda (mewakili WPP NRI 572) dan Selatan Jawa (mewakili WPP NRI 573). Pengambilan sampel rajungan di tiga lokasi yang berbeda yaitu Labuan (hasil tangkapan di Selat Sunda), Cilacap dan Banyuwangi (hasil tangkapan di Selatan Jawa). Pengukuran karakter morfometrik dengan metode konvensional dan Truss Network Analysis (TNA). Analisis hubungan lebar karapas dengan bobot menunjukkan bahwa rajungan di ketiga lokasi memiliki pola pertumbuhan masing-masing adalah isometrik, alometrik negatif, dan alometrik positif. Hasil uji kruskal wallis menunjukkan bahwa terdapat beberapa karakter morfometrik yang berbeda nyata pada rajungan jantan dan betina. Analisis kluster menunjukkan bahwa rajungan di Cilacap dan Banyuwangi memiliki kemiripan yang lebih tinggi dibandingkan dengan rajungan Labuan. Hasil analisis diskriminan menunjukkan bahwa populasi rajungan di Labuan berbeda dengan populasi rajungan di Cilacap dan Banyuwangi. Perbedaan karakter morfometrik menunjukkan bahwa potensi rajungan di ketiga lokasi memiliki lebih dari satu unit stok, sehingga diperlukan pengelolaan yang berbeda antara rajungan di Selat Sunda dengan rajungan di Selatan Jawa., Blue swimming crabs (BSC) inhabit sandy or muddy substrates of coastal waters. Variations of the aquatic environment and fishing intensity might affect on morphological characters of spesies to facilitate adaptation and both might characterize stock unit as well. This study was aimed at analyzing morphometric diversity of blue swimming crab in water of Sunda Strait (representative of Fisheries Management Area (FMA) 572 of Indonesia) and South of Java (representative of FMA 573 of Indonesia). The crab samples were taken from three different locations, Labuan (catches in the Sunda Strait), Cilacap, and Banyuwangi (catches in the South of Java). Convensional method and Truss Network Analysis (TNA) were applied on morphometric character measurement. Analysis of the relationship between carapace width with weight showed that blue swimming crab in those three locations showed isometric, negative allometric, and positive allometric growth patterns. Result of the kruskal wallis test showed that morphometric characters were significantly different between male and female individuals. Cluster analysis showed that crabs of Cilacap and Banyuwangi showed high similarities which tended to be close population, while Labuan’s crabs were seemed to be dissimilar. Result of the discriminant analysis showed that the blue swimming crab population in Labuan was different from the populations blue swimming crab in Cilacap and Banyuwangi. Therefore, differences in morphometric characters indicate that the potential of the blue swimming crab in those three locations were originated from more than one stock unit, so that different management is needed between BSC in the Sunda Strait and South of Java.
Keyword: FMA 572 and 573, morphometrics, Truss-Network-Analysis, stock unit

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