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"Microalgae has high nutritional value and are used to feed adult and larval stages of bivalves, the larvae of some fish and crustaceans and zooplankton. However, microalgae production for aquaculture animal is very expensive. To overcome this, the use of preserved microalgae such as algae concentrate and dried algae, or algal substitutes has been developed. There are both advantages and disadvantages to this alternative food. For example, even though the cost production for algal substitute yeast-based diet is cheaper, their nutritional value is much lower compared to fresh microalgae. Moreover, there is no significant difference in nutritional value between preserved (concentrated or dried) and fresh microalgae; however, preserving microalgae for long periods will affect their nutritional value. In spite of this problem, preserved microalgae such as algal concentrate and dried algae seem to be more effective to feed bivalves than algal substitutes yeast based diet due to their availability and relatively high nutritional value. Furthermore, algae concentrates are more suitable to replace fresh algae than dried algae. "

"Telah dilakukan penelitian untuk mengetahui pengaruh pemberian alga cokelat (Sargassum) dalam ransum terhadap pertumbuhan dan sintasan ikan nila srikandi (Oreochromis aureus x O. niloticus) yang dipelihara dengan sistem akuaponik. Terdapat 4 perlakuan dan 3 ulangan. P0 yang diberi pakan tanpa campuran Sargassum, kelompok P1 yang diberi pakan dengan campuran Sargassum 2%, kelompok P2 yang diberi pakan dengan campuran Sargassum 4%, dan kelompok P3 yang diberi pakan dengan campuran Sargassum 6%. Hasil uji anava satu faktor (P > 0,05) menunjukkan tidak adanya pengaruh nyata pemberian Sargassum terhadap pertumbuhan dan sintasan pada semua kelompok perlakuan.

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The research was done to observe the effect of brown algae (Sargassum) in the ration on the growth and survival of Srikandi tilapia (Oreochromis aureus x O. niloticus) were maintained aquaponics system. There are 4 treatments and 3 replication. P0 mixture fed without Sargassum, P1 group fed with a mixture of 2% Sargassum, P2 group fed with a mixture of Sargassum 4%, and the P3 group fed with Sargassum mixture of 6%. The feed is given three times daily for 8 weeks. The result anova test (P > 0.05) showed no significant effect on the survival and provision of Sargassum growth in all treatment groups."

"Kultivasi alga selain dapat mereduksi CO2, juga menghasilkan produk biomassa yang bermanfaat. Dalam memproduksi biomassa Chlorella di dalam suatu fotobioreaktor, dibutuhkan parameter hidrodinamika yang benar agar didapat hasil biomassa yang optimal. Dalam penelitian ini dilakukan pemodelan dan simulasi fotobioreaktor kolom gelembung untuk kultivasi alga Chlorella. Pola aliran untuk fasa gas dan fasa cair dimodelkan dengan menggunakan konsep dispersi dengan mempertimbangkan konveksi, difusi, lapisan batas dan laju perpindahan massa antarfasa.Simulai menggunakan program dilakukan guna mengetahui pengaruh dari parameter hidrodinamika terhadap konsentrasi alga. Hasil simulasi menunjukkan bahwa semakin tinggi reaktor kolom gelembung mengakibatkan turunya hold up fasa gas dan kenaikan koefisien perpindahan massa. Berbeda dengan laju superfisial gas umpan, semakin besar laju superfisial gas umpan hold up fasa gas meningkat dan terjadi penurunan koefisien perpindahan massa.

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Cultivation of algae in addition to reducing CO2, biomass also produces useful products. In producing Chlorella biomass in a photobioreactor, the correct hydrodynamic parameters required in order to obtain optimal biomass yield. This research is modeling and simulating a bubble column photobioreactor for the cultivation of algae Chlorella. Flow regim for gas phase and liquid phase are modeled by using the concept of dispersion taking into account convection, diffusion, boundary layer and mass transfer rate.

Simulations using program was conducted to determine the effect of hydrodynamic parameters on the concentration of algae. Simulation results show that the higher the resulting bubble column reactor hold downs and rise up the gas phase mass transfer coefficient. Unlike the superficial gas feed rate, where the greater the rate of superficial feed gas hold up increased gas phase and a decrease in the mass transfer coefficient. "

"ABSTRAKBeberapa manfaat alga yang telah diteliti yaitu sebagai sumber makanan tambahan dan bahan baku biodiesel. Salah satu mikroalga yang mudah ditemukan di berbagai habitat air yaitu mikroalga Oscillatoria sp. Penelitian ini bertujuan untuk melakukan perhitungan terhadap jumlah sel. Perhitungan jumlah sel dilakukan dengan 3 (tiga) metode, yaitu metode kapasitansi dengan menggunakan kapasitor plat sejajar, metode Counting Chamber dengan menggunakan hemositometer Improved Neubauer, dan metode Optical Density dengan menggunakan spektrofotometer. Hasil kapasitansi dan konstanta dielektrik udara yang didapatkan untuk validasi alat kapasitor yang telah dibuat yaitu 15,43 ± 0,67 pF dan 0,965 ± 0,003. Sehingga dapat disimpulkan alat tersebut cukup presisi untuk digunakan. Berdasarkan data yang didapatkan, dapat dibuktikan bahwa nilai kapasitansi dan absorbansi berbanding lurus dengan jumlah sel.

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ABSTRACTSome benefit from algae that has been discovered are as food source and biodiesel fuel. One of microalgae that easy to find in all water area is Oscillatoria sp. microalgae. The purpose of this research is to count the number of the cells. 3 (three) methods are used to count the number of the cells. The first one is Capacitance Method, this method using a parallel plate capacitor. The second method is Counting Chamber Method, this method using hemocytometer Improved Neubauer. The third method is Optical Density Method, this method using a spectrophotometer. The value of capacitance and air dielectric constant that had obtained are used for validating capacitor instrument. The value are 15,43 ± 0,67 pF and 0,965 ± 0,003. From this result, we can conclude the instrument is precision enough to use. The value of capacitance and absorbance are proportional with the number of the cells."