Judul: Biologi Reproduksi ikan belanak Chelon subviridis (Valenciennes 1836) di Perairan Karangsong, Indramayu
Abstrak: Greenback mullet (Chelon suviridis) belong to family of Mugilidae. Greenback mullet have a high economic value in Karangsong water. Information of C. subviridis in this location is limited, whice is necessary to study on reproduction for its management. Through this study, reproduction pattern of C. subviridis in Karangsong water are determined. The study was conducted from December 2012 to May 2013. Total number of fishes that taken during the study was 336 individuals. The results showed that the sex ratio between males and females is 1:2,03 with Chi-square test. Condition factors ranged from 0,6881 to 0,8377 %. Greenback mullet males mature more rapidly that females with mature gonad of 114 mm for male and 102 mm for female. Peak spawning season of C. subviridis in the waters of Karangsong. Greenback mullet is thought to occur in early February. Reproductive potential of C. subviridis is quite large in the amount of 9.691 to 173.335 eggs. Eggs diameter of C. subviridis ranged from 0,18 to 0,75 mm with the mode of spread of two types of spawning peaks with partial (partial spawner).
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Judul: Biologi Reproduksi Ikan Menga (Sicyopterus lagocephalus, Pallas 1770) di Sungai Cibareno, Sukabumi, Jawa Barat
Abstrak: Ikan menga (Sicyopterus lagocephalus) merupakan spesies amphidromus yang keberadaanya dapat ditemukan di Sungai Cibareno. Rencana pembangunan Bendung Caringin di Sungai Cibareno diduga dapat mempengaruhi pola reproduksi dan kelangsungan hidup ikan menga. Penelitian ini bertujuan menganalisis aspek biologi reproduksi ikan menga (Sicyopterus lagocephalus, Pallas 1770). Penelitian dilakukan selama empat bulan (Mei, Juni, Juli, dan September 2022) di Sungai Cibareno, Sukabumi, Jawa Barat. Total ikan contoh yang tertangkap selama penelitian berjumlah 163 ekor, terdiri atas 106 ekor ikan jantan dan 57 ekor ikan betina. Kisaran panjang total ikan menga yang tertangkap 32-150 mm. Nisbah kelamin sebesar 1:0,54 (tidak seimbang). Faktor kondisi ikan menga berkisar 0,98- 1,09. Ukuran pertama kali matang gonad ikan menga jantan dan betina berada pada ukuran 87,5 mm dan 78,5 mm. Ikan menga pertama kali tertangkap pada ukuran 99,95 mm. Puncak pemijahan ikan menga terjadi pada bulan Mei dan di bagian hilir sungai. Potensi reproduksi ikan menga berkisar 24.320-73.810 butir telur dengan pola pemijahan total spawner.
Keyword: Cibareno River, gonad, red-tailed goby, reproductive biology

Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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