Judul: Profil Kualitas Air pada Pemeliharaan Induk Ikan Lele Clarias sp. Sistem Bioflok
Abstrak: Teknologi bioflok merupakan salah satu alternatif baru dalam mengatasi masalah kualitas air dalam akuakultur, teknologi ini diadaptasi dari Teknik pengolahan limbah domestik secara konvensional. Penelitian ini bertujuan untuk menentukan peranan teknologi bioflok terhadap perbaikan kualitas air pada media pemeliharaan induk ikan lele. Penelitian ini membandingkan kualitas air pada media pemeliharaan kontrol dan bioflok dengan masing-masing lima kali ulangan selama 112 masa pemeliharaan. Parameter kualitas air yang diukur meliputi parameter fisika yaitu suhu, TSS, dan volume flok; parameter kimia yaitu DO, pH alkalinitas, nitrit, nitrat, dan TAN; parameter biologi yang diukur yaitu jenis fitoplankton, TKH, panjang total, dan bobot tubuh. Hasil penelitian ini menunjukkan bahwa parameter suhu, TAN, TKH, panjang total, dan bobot tubuh tidak berbeda nyata (P>0.05), sedangkan parameter TSS, DO, pH, alkalinitas, nitrit, dan nitrat berbeda nyata (P < 0.05). Selain itu, penelitian ini menunjukan adanya perbaikan kualitas air pada nilai pH, TSS, alkalinitas, nitrit, dan nitrat dengan menggunakan teknologi bioflok…
Keyword: Biofloc, Broodstock catfish, Water quality, Aquaculture, Domestic waste, Temperature, Alkalinity, PH, TSS, TAN, DO

Judul: Kualitas Larva Ikan Lele Clarias sp. yang Dipelihara dengan Teknologi Bioflok
Abstrak: This study aimed to determine the effect of biofloc technology application on broodstock and larva culture on the quality of African catfish Clarias sp. larvae. Catfish broodstock reared in two different systems, BFT and control, and the larvae from each broodstock were subsequently housed in these two systems (BFT and control). Two days post hatched larvae with a range of body length of 0.55-0.76 cm were distributed into 2 L aquaria at a density of 100 ind/L and maintained for 14 days. Besides growth parameters, larvae strength were assessed using strength and salinity stress tests. Strength test was conducted by maintaining the larvae without feeding for 3 days. Salinity stress test was done by soaking the larvae into 20 g/L salinity water for 20 minutes. The growth test showed that broodstock and larvae culture system had no significant effect on larval survival and total length variance, but significantly affected larval growth. Furthermore maintaining catfish broodstock and larvae in BFT resulted in larvae with higher survival in strength test and salinity stress test.
Keyword: BFT, broodstock, catfish, larvae, quality

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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