Judul: Aspek reproduksi ikan Totot (Johnius belangerii Cuvier, 1830) di perairan delta Cimanuk, Pabean Ilir, Pasekan, Indramayu, Jawa Barat
Abstrak: Belanger’s croaker (Johnius belangerii) is a fish from family Sciaenidae. This fishes have been many catching, it has economical values, and important ecological values in delta Cimanuk, Pabean Ilir. Research was conducted from August 2013 until December 2013 to determine some reproductive aspects of J. belangerii. Samplings were carried once a month using gillnet with mesh size 1-3 inches. Total of J. belangerii were caught is 258 individuals with ranged from 83-186 mm in length. Result showed that sex ratio of J. belangerii (males: females) was 1:4,13. First maturity in length of female and male were 136-156 mm and 159-170 mm. The reproductive season was from October to December. Fecundity varied from 11.554 to 87.855 eggs and it has positive correlation with length of fish. Reproductive type of J. belangerii could be grouped to total spawner with the size of egg diameters were 0,015-0,048 mm.
Keyword: reproductive, Johnius belangerii, Delta Cimanuk, Bogor Agricultural University (IPB)

Judul: Makanan Ikan Totot Johnius belangerii (Cuvier 1830) Di Delta Cimanuk Pabean Ilir Pasekan, Indramayu, Jawa Barat
Abstrak: Food could determines the survival, growth, and reproduction of fish. The purpose this study was to know the food type of belanger’s croaker in Delta Cimanuk Pabean Ilir Pasekan, Indramayu, West Java. This study were conducted on Maret-Mei 2014. Total samples analysed were 214 individuals. The stomach content was analyzed using index of preponderance (IP). The result of study showed that belanger’s croaker was carnivora with main food crustacean Acetes sp. as where small fish was more specialist the big fish. The opportunity a intraspesifik competition of croaeker belanger’s in food utilization occured between 92-115 mm and 116-139 mm for female fish, and between 68-91 mm and 92-115 mm and between 92-115 mm and 164-187 mm for male fish. The female fish was more diverse than the male fish in food utilization. Belanger’s croaker actively foraging during the day and actively foraging in water bodies near bottom waters.
Keyword: Bogor Agricultural University (IPB), Food., Delta Cimanuk, Belanger’s croaker

Judul: Sintesis dan Karakterisasi Membran Polistirena Terfluorinasi untuk nnnnnnnDirect Methanol Fuel Cell
Abstrak: One of common energy resources is direct methanol fuel cell (DMFC), which use methanol as fuel. The important component in DMFC is proton exchange membrane. The study used fluorinated polystyrene membrane (PSf) as proton exchange membrane through fluorination process. PSf membrane was made with PSf concentration of 5%, 10%, and 15 %. Fluorination has caused change of membrane physical properties with presence of pores in the membranes. The best water uptake was shown by PSf 5% that is 11.07%. Membrane activation increased the proton conductivity from 0.52 × 10-7 S/cm to 0.54 × 10-7 S/cm for polysryrene (PS) and 0.44 × 10-7 S/cm to 0.69× 10-7 S/cm for the PSf. Qualitative test of methanol permeability showed good result with dry underneath the surface of membrane because methanol did not pass through the membrane. In DMFC system, proton conductivity of the PSf membrane is higher than that of PS membrane, while variation of conductivity from PSf membranes is caused by gaps at the PSf membranes.
Keyword: