Effect of Biofloc Technology in the Nursery Rearing of Goldfish

By : Mohamed Faizullah , B. Ahilan , Rajagopalsamy. C.B.T. , T. Francis

Page No: 167-179

Abstract
In the present study, the impact of biofloc technology on the goldfish fry was investigated. The mean value of water temperature, pH, dissolved oxygen, ammonia-N, nitrite-N, nitrate-N and floc volume (FV) recorded in the biofloc treatment system for goldfish fry were 27.3°C, 7.9, 3.9 mg/l, 48.32 µg-at[1]N/l, 0.62 µg-at-N/l, 238.08 µg-at-N/l and 8.48 ml/l respectively. The control set during the nursery rearing of goldfish fry registered the mean value of water temperature (28.9°C), pH (8.2), dissolved oxygen (4.4 mg/l), ammonia-N (82.15 mg-at-N/l), nitrite-N (0.72 mg-at-N/l), nitrate-N (76.85 mg-at-N/l) and FV (0.093 ml/l) more than the treatment excepting the nitrate-N and Floc volume. Chlorella sp, Oscilatoria sp, Stephanodiscus sp, Coscinodiscus sp, Navicula sp, Amphiprorasp, 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 water while the control tank water had only Chlorella sp, Coscinodiscus sp and Chaetoceros sp. The maximum SGR in biofloc treatment (138.64) and control (107.41) was in 35th day. The percentage growth increment of 376.44 in gold[1]fish fry was recorded in the biofloc treatment than the control set of experiments.

Authors :
Mohamed Faizullah, Ahilan B, Rajagopalasamy C.B.T. and FrancisT
Department of Inland Aquaculture, Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi-8.