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The recirculating system for tilapia aquaculture is an intensive system with very high stocking densities, thus requiring prime water quality and optimal flow rates. The research aims to determine the influence of different interactions between flow rates and stocking densities on the growth and survival of tilapia (Oreochromis niloticus) in a recirculating system. The research design employs a Complete Randomized Factorial Design (CRFD) with two factors: Flow Rate (D) with two levels, namely D1 = 0.25 liters/second and D 2 = 0.50 liters/second, and Stocking Density (P) with two levels, namely P1 = 100 fish/m3 and P2 = 150 fish/m3. The results indicate that the flow rate factor (D) has no significant effect, while the stocking density factor (P) has a significant effect, and there is no interaction between the factors. The treatment D1P1 (0.25 liters/second and 100 fish/m3) is the optimal treatment, with a survival rate of 99.1%, relative weight gain of 784.56%, and feed conversion ratio of 1.34. [ABSTRACT FROM AUTHOR]

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Maru is an endemic species of the Kapuas river which is currently in a positive state and its demand continues to increase. The optimal density of this fish culture has not been found with a system that is suitable for its habitat, namely recirculation. The purpose of this study was to determine the optimal stocking density with a recirculation system on growth performance. The maru seeds used are 7-9 cm in size, with a combination of pellet and magot feed with a 5% feed dose. This study used a completely randomized design (CRD) with 4 treatments and 3 repetitions. Treatment A: Stocking density of 2 birds/liter, Treatment B: 3 birds/liter, treatment C: 4 birds/liter, treatment D (control): 1 head/liter without any recirculation system. Data collection is carried out once every 15 days, while water quality parameter data is carried out 2 times a day, namely in the morning and evening. The growth rate between treatments A and B had a significant value and was significantly different (p<0.05). Where the absolute growth (length and weight) in treatment A was 9.93 cm and 10.02 gr. Followed by treatment B of 6.3 cm and 5.84 g. Treatment B had significant differences from treatments C and D. Where the absolute length and weight growth of treatments C and D were 3.43 cm, 3.9gr, and (3.2 cm, 3.69 gr, respectively). The results of this study indicate that the density of stocking is inversely proportional to the growth in length and weight of maru. Furthermore, the water quality during maintenance is still in the fairly good category, this is the impact of the recirculation system on the waters that can maintain water quality during maintenance. [ABSTRACT FROM AUTHOR]

This study aims to determine the optimal stocking density of tiger shrimp seed (Penaeus monodon) were maintained in media biofloc. This study uses a randomized complete design with four treatments and three replications ie, treatment A control (10 tiger shrimp seed / container without the addition bioflok), treatment B (10 tiger shrimp seed / container with the addition bioflok), treatment C (15 tiger shrimp seed / container with the addition bioflok) , treatment D (tiger shrimp seed / container with the addition bioflok). The observed parameters include the specific growth rate (SGR), a daily increase of the absolute length and survival rate (SR) and feed efficiency. The results showed that the stocking density gives significantly effect to increase the daily increase of the absolute length, SGR and feed efficiency value of tiger prawn seed. Values length and SGR growth are highest in treatment C respectively, 3.1 ± 0.06 cm and 1.48 ± 0.041%/day, meanwhile, the value of feed efficiency is highest in treatment D amounted to 47,43 ± 7,26%. There is no significant effect between the stocking density differences of each treatment on the survival of tiger shrimp juvenile Optimal maintenance toward stocking density for tiger shrimp seed using bioflok system is 15 tiger shrimp seed / 10 liters of water.Penelitian ini bertujuan menentukan padat tebar optimal benih udang windu (Penaeus monodon) yang dipelihara dalam media bioflok. Penelitian ini menggunakan rancangan acak lengkap dengan empat perlakuan dan tiga ulangan yaitu, perlakuan A kontrol (10 ekor/wadah tanpa penambahan bioflok), perlakuan B (10 ekor/wadah dengan penambahan bioflok), perlakuan C (15 ekor/wadah dengan penambahan bioflok), perlakuan D (20 ekor/wadah dengan penambahan bioflok). Parameter yang diamati meliputi kelangsungan hidup (SR), Pertambahan Panjang Mutlak, Laju Pertumbuhan Spesifik (SGR) dan Efisiensi Pakan. Hasil penelitian menunjukkan bahwa perbedaan padat tebar berpengaruh nyata meningkatkan pertumbuhan panjang, SGR dan nilai efisiensi pakan benih udang windu. Nilai pertumbuhan panjang dan SGR tertinggi terdapat pada perlakuan C masing masing sebesar 3,1±0,06 cm dan 1,48±0,041%/hari, sedangkan nilai efesiensi pakan tertinggi terdapat pada perlakuan D sebesar 47,43±7,62%. Tidak terdapat perbedaan yang nyata antara perbedaaan padat tebar tiap perlakuan terhadap kelangsungan hidup benih udah windu. Padat tebar optimal pemeliharaan benih udang windu dengan menggunakan sistem bioflok adalah 15 ekor/ 10 liter air.