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The Productivity of Using Current Generating Circular Tanks for Tilapia Fingerling (Oreochromis niloticus (Linnaeus, 1758)) Production

100%
Suryadi I. B. B., Fadylah M. I., Iskandar I., Yustiati A.
World News of Natural Sciences
|
2019
|
vol. 27
85-95
EN
This research conducted to determine the optimum water current models for growth performance and survival rate of tilapia fingerlings (O. niloticus) in circular tanks. The method used in this research is Completely Randomized Design (CRD), which consists of three treatments and four replications. The treatments are circular tanks without water current (control), circular tanks with 0.1 m s-1 water current and circular tanks that combine 0.1 m s-1 water current with venturi aeration. Tilapia fingerlings were kept in circular tanks with 30 cm diameter and 37 cm of height, with water level of 30 cm. 50 fingerlings with size of 2-3 cm were reared in every circular tank. The feed is given 3 times daily with a feeding rate of 5% from biomass. Absolute growth rate, specific growth rate, survival rate, feed conversion ratio and feed efficiency were observed every ten days, while water quality was assessed weekly. After 42 days of rearing, the results showed that the 0,1 m s-1 water current combined with venturi aeration had the highest dissolved oxygen level (6.5-7.3 mg L-1), the lowest ammonia levels (0.15-0.20 mg L-1), 92% survival rate, 1.17 g absolute growth rate, 3.65% specific growth rate, 1.3 feed convertion ratio and 77.8% feed efficiency.
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The Prevention of Aeromonas hydrophila on Tilapia (Oreochromis niloticus) Fingerling using Current Generating Circular Tanks

86%
Suryadi I. B. B., Rizhmi N. M., Grandiosa R., Rochima E.
World News of Natural Sciences
|
2022
|
vol. 40
91-103
EN
This research focused on determining the best survival performance of tilapia (Oreochromis niloticus (Linnaeus, 1758)) fingerlings in a current generating circular tanks and challenged by Aeromonas hydrophila. This research used a Completely Randomized Design (CRD) with four treatments and four replications. Fish size are ranging from 5 to 7 cm that obtained from Fish Breeding Center of Bandung City, Indonesia. The treatment used are water current and venturi combination with water velocities of 0 m s-1 (A), 0.06 m s-1 (B), 0.1 m s-1 (C), and 0.2 m s-1 (D). The research started with fish rearing (40 days) and was followed by a challenged test (14 days). Tilapia fingerlings were challenged by A. hydrophila at density 108 cfu ml-1 using immersion method. The parameters were gross clinical symptoms, survival rate, red blood cells, white blood cells and water quality. The results showed that current and venturi combination of 0.1 m s-1 gave the best immune performance seen from the increase in red blood cells and white blood cells with 48% of survival rate, however survival rate was not significantly different (p ≤ 0.05) among treatments. The increase in red blood cells and white blood cells was from 1.1 × 106 cells mm3-1 to 5.1 × 106 cells mm3-1 and 4.2 × 105 cells mm3-1 to 5.6 × 105 cells mm3-1 respectively. Current generating circular tanks also enhanced tilapia immune system against A. hydrophila infection since fewer clinical symptoms occurred during challenged period.
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