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: Katalis Eterifikasi Gliserol Berbasis Poli–(asam stirena sulfonat) dari Limbah Styrofoam.
Abstrak: Styrofoam waste can be converted to poly–(sulfonate styrene acid) (PSSA) that can be used as catalyst. The objective of this research is to get PSSA that can catalyze the etherification of glycerol and benzyl alcohol. The styrofoam waste was converted to PSSA by reacting with H2SO4 98% (as sulfonation agent) and P2O5 (as sulfonation catalyst) at 40 °C for 6 hours. Characterizations of PSSA included functional groups, sulfonation levels, water swelling, and thermal stability. The yield of PSSA was 40-55%. The success of sulfonated polystyrene was shown by –SO3H group absorption at 1157.29 cm-1. Etherification of glycerol and benzyl alcohol using PSSA catalyst was conducted at 110 °C for 12 hours. The conversion in producing mono–benzyl ether glycerol was 8.10%, 1,3–dibenzyletherglycerol 2.60%, and dibenzyl ether 9.80%. Therefore, the PSSA can be used as etherification catalyst.
Keyword: benzyl alcohol, etherification, glycerol, polystyrene, PSSA