Judul: Biologi Reproduksi Ikan Layang (Decapterus Russelli Ruppell, 1830) Di Perairan Selat Sunda
Abstrak: Ikan layang (Decapterus russelli) merupakan salah satu ikan ekonomis penting di Indonesia. Penelitian ini bertujuan untuk mengkaji aspek biologi reproduksi ikan layang di perairan Selat Sunda. Penelitian dilakukan sejak April-Agustus 2015 di perairan Selat Sunda dengan menggunakan metode pengambilan contoh acak berlapis (PCAB). Berdasarkan hasil pengamatan rasio kelamin ikan layang jantan dan betina yang diperoleh selama penelitian adalah 1,29:1. Ikan layang jantan lebih cepat mencapai matang gonad dibandingkan dengan ikan layang betina yakni 194 mm dan 196 mm (metode King) serta 194 mm dan 195 mm (Metode Spearman-Karber). Waktu pemijahan ikan layang terjadi pada bulan Mei–Agustus dengan puncak pemijahan pada bulan Juli dilihat berdasarkan besarnya nilai tingkat kematangan gonad dan indeks kematangan gonad pada bulan tersebut. Potensi reproduksi ikan layang tinggi yaitu sebesar 2330-117660 butir telur dengan pola pemijahan lebih dari satu kali (partial spawner) dengan ukuran diameter telur ikan layang berkisar antara 0,125-0,875 mm.
Keyword: Decapterus russelli, ikan layang, reproduksi, Selat Sunda.

Judul: Biologi Reproduksi Ikan Layang (Decapterus russelli Ruppell, 1830) yang Didaratkan di Pelabuhan Perikanan Pantai Labuan, Banten.
Abstrak: Reproduksi adalah kemampuan individu untuk menghasilkan keturunan sebagai upaya untuk melestarikan jenis atau kelompoknya. Penelitian ini bertujuan untuk mengkaji aspek biologi reproduksi ikan layang (Decapterus russelli) di perairan Selat Sunda. Data yang digunakan merupakan data primer. Contoh ikan diambil setiap bulan dari Mei sampai Oktober 2018 yang didaratkan di Pelabuhan Perikanan Pantai Labuan, Banten. Hasil analisis uji t didapatkan pola pertumbuhan ikan layang adalah isometrik dan faktor kondisi secara umum tidak menunjukkan variasi yang tinggi. Hasil uji Khi-kuadrat menunjukkan bahwa rasio kelamin ikan layang seimbang. Ukuran rata-rata ikan layang jantan dan betina pertama kali matang gonad (Lm) melalui analisis Spearman-Karber masing-masing 198 mm dan 194 mm. Musim pemijahan berdasarkan distribusi tingkat kematangan gonad (TKG) V dan VI dan indeks kematangan gonad (IKG) terjadi pada bulan Oktober. Tipe pemijahan berdasarkan distribusi diameter telur adalah total spawner. Potensi reproduksi ikan layang tergolong tinggi dengan fekunditas berkisar antara 735-43 820 (rata-rata 17 356) butir telur.
Keyword: Ikan layang (Decapterus russelli), Pelabuhan Perikanan Pantai (PPP) Labuan, reproduksi

Judul: Enhancement of photon absorbtion on BaxSr1-xTiO3 thin films semiconductor using photonic crystals.
Abstrak: In this research, has been conducted BaxSr1-xTiO3 (BST) thin films manufacturing for mole fraction x = 0.25, 0.35, 0.45, and 0.55; and concentration of 1 molar using chemical solution depositon (CSD) method. The materials, which are used in this research, are barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%], titanium isopropoxide [Ti(C12O4H28), 97.999%], gallium trioxide [Ga2O3], 2-methoxyethanol [H3COOCH2CH2OH, 99%] and 1 x 1 cm of transparent conductive oxide (TCO) glass as substrate. Two BST thin films are made that for BST thin films which are doped by 10% galium (BGST) as p-type layer and pure BST solution as n-type. BST solution is made by reacting barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%] and titanium isopropoxide [Ti(C12O4H28)] into 2-methoxyethanol solvent [H3COOCH2CH2OH, 99%] in accordance with mass gram for each x value. While, BGST solution is made in the same way as BST solution, plus adding gallium at 10% of the mass of BST. Once all materials are reacted, then vibrated using ultrasonic for 90 minutes, and followed by coating BGST / BST on the TCO substrate. Once the layer is formed, then annealed for 15 hours at temperature of 500 °C with increasing rate of 1.67 oC/minute. Characterizations of BST thin films with or without photonic crystals include the absorbance and transmittance in the visible light spectrum, as well as the electrical photoconductivity characterizations. From BST thin films without photonic crystals indicate that our thin films have light absorption area on almost the entire range of the visible light spectrum even to the infrared range with absorption value over than 67.6%, in addition, it can be seen that the maximum absorbance of BST thin films for all mole fractions lie in blue to green light spectrum region, 457 nm ≤ λ ≤ 570 nm and the minimum in yellow to red light spectrum region, 570 nm ≤ λ ≤ 678 nm. The largest absorbance is found at x = 0.25 with average absorbance value of 92.04% and maximum and minimum absorbance peaks at wavelength of 500.89 and 657.72 nm, respectively. At x = 0.35, average absorbance value decreased to 83.55% with maximum and minimum peaks at 505.73 and 613.68 nm, respectively. Then increased to 91.16% at x = 0.45 with maximum and minimum peaks at 506.04 and 618.56 nm, respectively. At x = 0.55, average absorbance value decreased to 80.12% with maximum and minimum peaks at 507.85 and 608.79 nm, respectively. Moreover, it can be seen that the addition of barium mole fraction leads to wider maximum absorbance or minimum transmittance peaks and narrower minimum absorbance or maximum transmittance peaks in the same range of the green and blue & red light spectrums, respectively. BST thin films with photonic crystals show increasing in absorption for all x values in the range of 3.04 into 13.33%. At x = 0.25, average absorbance percentage increased 3.96% from 92.4 into 95.68%, for x = 0.35 average percentage increased 7.07% into 89.45 from 83.55%. Furthermore, average absorbance of BST thin films at x = 0.45 increased 3.04% from 91.16 into 93.93% and x = 0.55 has
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