Judul: The Diversity of Morphometric Characters of Blue Swimming Crab
(Portunus pelagicus Linnaeus, 1758) from East Lampung, Rembang, and South
Madura as a basis for management
Abstrak: Rajungan hidup di perairan pesisir dengan substrat berpasir atau berlumpur dengan kedalaman suatu perairan hingga 40 m, termasuk ekosistem estuari, laguna, dan lamun. Perbedaan karakteristik lingkungan perairan dapat menjadi faktor berubahnya karakter morfometrik suatu spesies sebagai bentuk adaptasi suatu organisme. Tujuan dari penelitian yaitu menganalisis keragaman morfometrik rajungan (Portunus pelagicus Linnaeus, 1758) dengan dua metode berbeda di perwakilan Wilayah Pengelolaan Perikanan Negara Republik Indonesia (WPPNRI) 712 yaitu perairan Lampung Timur, Rembang, dan Selatan Madura. Metode yang digunakan yaitu konvensional dan truss network analysis (TNA) yang dimodifikasi. Analisis Kruskal Wallis dengan metode konvensional terdapat 10 karakter yang berbeda signifikan pada rajungan jantan dan betina, sedangkan dengan metode TNA pada rajungan jantan terdapat 30 karakter yang berbeda signifikan dan pada rajungan betina terdapat 12 karakter. Hasil analisis kluster dengan kedua metode menunjukkan bahwa rajungan di Lampung Timur dan Rembang memiliki kemiripan yang cenderung dekat, sedangkan rajungan Selatan Madura cenderung jauh. Hasil analisis diskriminan terhadap karakter morfometrik rajungan jantan dan betina dengan metode konvensional dan TNA menunjukkan populasi di Selatan Madura membentuk kelompok yang lebih terpisah dengan populasi di Lampung Timur dan Rembang.
Keyword: blue swimming crabs, conventional, morphometric characters, Truss Network Analysis

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: 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