Growth and Feed Efficiency of Gourami Fish Reared in Biofloc Media with Different C/N Ratios
Keywords:
gourami fish, growth, feed efficiency, biofloc, mortality, bacterial abundance, C/N ratio.Abstract
The study was conducted to determine C/N ratio which gave the best growth, feed conversion ratio, feed efficiency, survivability, mortality rate, bacteria abundance and reduced nitrogen content in the production media of gourami fish. Treatments consisted of different C/N ratios including control, CN ratio 12, CN ratio 16, and CN ratio 20 in the production media. The trial was conducted in 45 days. Daily weight gain, feed conversion ratio, feed efficiency, survivability, mortality rate, abundance and types of bacteria, total ammonia-N (TAN), total nitrite, and total nitrate contents were evaluated. Results showed that different C/N ratios gave significant effects on feed conversion ratio, feed efficiency, survivability, and mortality rate, but not on daily weight gain. The best feed conversion ratio and feed efficiency was found in C/N ratio 12 while the best survivability and mortality rate were found in CN ratio 20. The bacteria spreading over the treatment groups were found to reduce from 11 types in the beginning of the trial period to only 8 types in the end of the trial period. In all treatment groups Micrococcus sp. was found in the beginning of the trial period while Bacillus sp. was found in the end of the trial period. Based on TAN, nitrate, and nitrite measurements, in production media with high C/N ratios, N content was found to be reduced and in the amount ranges that were good for fish growth even though no water changes were done.
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