Biofloc Technology and Bio - extract Applications for Indoor Culture of Nile Tilapia (<I>Oreochromis niloticus</I>)
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Abstract
This research aimed to study growth, survival rate and food conversion ratio of tilapia size 2.7 - 3 centimeter, and water quality analysis in various culture systems. The experimental arrangement was a completely randomized design with 4 treatments and 3 replications as follows: treatment I; cultured with normal system (control), treatment II; cultured with biofloc system, treatment III; cultured with bio - extract and treatment IIII; cultured with biofloc system + bio - extract. The cultivation period was 8 weeks. At the end of the experiment, the results showed that the tilapia culture with biofloc system (treatment II) was the best culture system. As a result, the tilapia showed good growth, high survival rate and low food conversion ratio; and we can treat ammonia without water changes therefore making cost savings. But we may need to control the number of suspended solids in the water, not exceeding 500 milligrams per liter. We should also control the pH levels, not to go below 6.5. We also found the flocs contained 21 % protein of the dry weight. There were many species of plankton: Vorticella sp., Paramecium sp., Euchlanis sp., Rotaria sp., Amoeba sp., Arcella sp., Scenedesmus sp., Euglypha sp., rotifers, Brachionus sp., Centropysis sp., Prorodon sp., Trichocerca sp. and Bdelloidea sp. all of which were living feed that the tilapia can eat any time.
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References
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