Browsing by Author "Sarita, Miss K"
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ThesisItem Open Access Effect of different carbon sources on water quality, growth performance and survival of Amur carp in Biofloc system(Post-Graduate Department of Aquaculture, OUAT, Bhubaneswar, 2020) Sarita, Miss K; Sial, Nabakishore; Nanda, Saumyendra; Sahu, Brundaban; Kund, Ganesh ChandraAn experiment was conducted for 90 days in 200 liters FRP tanks to evaluate the growth performance, survival and water quality parameters of Amur carp (Cyprinus rubrofuscus) reared in different carbon sources such as tapioca starch, jaggery, and cornstarch in biofloc based aquaculture system. The experiment was carried out following a completely randomized design where 120 of Amur carp were randomly distributed in 12 experimental tanks in triplicates. The carbon-nitrogen ratio was maintained 20:1 throughout the experimental period in biofloc tanks. No carbon source was added in control with periodical water exchange and siphoning. The mean body weight of fish during the stocking was 3.56 ±0.01 g, 3.57±0.02 g, 3.57±0.02 g, and 3.56±0.02g respectively in T0, T1, T2, and T3. At the end of the experiment, the highest growth reported in jaggery treated tank, i.e., T2(19.87±0.54 g), lowest in tapioca starch T0 (10.26±0.59 g). The higher average daily growth was recorded from T2 (0.18g), followed by T3 (0.17g), T1 (0.11g), and T0 (0.07g) at 90 days of culture. The highest SGR found in T2 (2.38%) followed by mean higher SGR (1.91%), higher PER(3.89), higher FER(0.89), lowest FCR (1.12), which showed a significant difference between the control and treated tanks (P<0.05) during the experiment. It is caused due to quick dissolving ability and more nutritive floc production. The highest survivability (100%) found in cornstarch treated tanks. This is because of optimal floc production and the absence of sticky nature in floc, unlike jaggery. The treatment means which differ significantly is done by computing the critical difference (CD) found to be 0.9. The difference between the treatment means T0 and T1, T0 and T2, T0 and T3, T1 and T2, T1 and T3, T2, and T3 is more than the CD value indicating the significant difference between these treatments. During the 90days of the experimental period, the water temperature ranged between 24°C to 27°C without any pronounced variation. In the present study, pH varied from 7.1(T2) to 8.5(T3), and the DO was ranged between 5.8mg/l(T2) to 7.63 mg/l(T0). The alkalinity varied from 100 ppm(T1) to 148ppm(T2) and total ammoniacal nitrogen varied from 0.00ppm(T0) to 0.80ppm(T2). The highest nitrite concentration found in 0.07ppm(T3) and nitrate were 9.70ppm(T2). A significant difference was found in all water quality parameters within the treatments and replications, was examined through two-way ANNOVA at a 5% level of significance. The present investigation found out results showed that all the essential water quality parameters except temperature, even if varied significantly within the experimental days and among the treatments, still fall within a suitable range to become conducive to fish growth and survival. Key words: