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: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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