Judul: Effect of osmotic load on survival, larval development time, and growth potential of freshwater giant prawn post-larvae
Abstrak: The production of freshwater giant praw n through rearing should be increased continuously considering the ever-incre asing market demand. Acceleration in increasing production has been constrained by limitation of seed quality and quantity. The problem has been in effectiveness of salinity management without taking into consideration larval osmotic load in a ha tchery. Hence, the research aimed at understanding osmotic compartment that pot entially plays an important role in survival, larval development, and the potential growth of post-larva of freshwater giant prawns. The basic principal used as determining base was minimizing osmotic load through adaptation and efficiency of energy utilization. The experimental method was causal comparative conditional; while the experimental design used was a complete randomized design with four salinity treatmen ts and three replications. The research consisted of three experiments, covering effects of osmotic load on: (1) larval development, (2) rate of oxygen consumption, and (3) growth potential of freshwater giant prawn post-larvae. Observation was c onducted on those critic al stadium based on preliminary experiment; comprising those of 6 th , 8 th , 11 th and post-larva using the design of complete random type with four tr eatments of salinity and three replications.
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Judul: The addition of calcium to increase the survival and growth of juvenile giant freshwater prawn (Macrobrachium rosenbergii de man) on the medium salinity
Abstrak: Mineral calcium plays a role in the process of osmoregulation and the formation of the exoskeleton of shrimp. This study aimed to determine the optimal calcium levels that can support the survival and growth of prawns and evaluate the role of calcium for the survival and growth of prawns on the medium salinity. The study consisted of two steps, the first to determine the range of calcium concentrations. The next steps evaluated the role of calcium on the frequency of molting, osmotic work rate, oxygen consumption rate, growth rate, survival and feed efficiency. This study used a completly randomized design with four treatments and three replications (A.salinity of 4 ppt + 0 mg/L Ca(OH)2 B. salinity of 4 ppt + 25 mg/L Ca(OH)2, C.salinity of 4 ppt + 50 mg /L Ca(OH)2 and D. salinity of 4 ppt + 75 mg/L Ca(OH)2 ). Results showed that adding calcium to the medium salinity can decrease levels of osmotic work and oxygen consumption and increasing the frequency of molting, growth rate, survival rate and feed efficiency. The addition of calcium to the medium salinity with a concentration of 50 mg/L Ca(OH)2) is the best medium for growth of juvenile giant freshwater prawn.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.