Indian Journal of Science and Technology

Abstract

In the present study, the impact of biofloc technology on the growth of goldfish young ones was investigated. In the mean value of water temperature, pH, dissolved oxygen, ammonia-N, nitrite-N, nitrate-N and Floc Volume (FV) in biofloc treatment system where goldfish young ones were reared was 25.5o C, 7.9, 3.4 mg/l, 51.92 µg-at-N/l, 1.15 µg-at-N/l, 364.52 µg-at-N/l and 5.25 ml/l respectively. The control set registered the mean value of water temperature (28.6o C), pH (8.1), dissolved oxygen (3.9mg/l), ammonia-N (64.96µg-at-N/l), nitrite-N (2.42µg-at-N/l), nitrate-N (165.22 µg-at-N/l) and FV (0.24ml/l) more than the treatment excepting the nitrate-N and Floc volume. Chlorella sp., Oscilatoria sp., Stephanodiscus sp., Coscinodiscus sp., Navicula sp., Amphiprora sp., Nitzschia sp., Chaetoceros sp., Cyclotella sp., Triceratium sp., Cymbella sp., Stentor sp, Paramecium sp, Cyclidium sp, Peranema sp, Petalomonas sp, Rotifer, Nematode or round worm, Chaetonotus sp. and Cyclops sp. were observed in the biofloc treatment tank while the control tank had only Chlorella sp., Coscinodiscus sp. and Chaetoceros sp. The maximum SGR (25.78) was observed in biofloc treatment while in control the same was 22.87. 91.8 percent survival rate was registered in the young ones of Goldfish reared under biofloc treatment. 52.88 percent growth increment was recorded in goldfish young ones under biofloc treatment when compared with the control.

Keywords: Biofloc, Goldfish, Growth and Survival, Length Weight Relationship, Proximate Composition