author(s)
Naresh Raj Keer, Mrinal Kanti Datta, Manmohan Kumar, Arun Bhai Patel and Satyajit Das

abstract
Carbon budget was performed for the nursing of spawn of Cirhhinus reba in 9 tanks for 15 days and each of 20 m² water area. Three different treatments @ T1: 3.0, T2: 5.0 and T3: 7.0 million ha^-1 spawn were maintained. The experimental spawn were fed with 30% protein diet in powder form and it was formulated by using soybean meal, mustard oil cake, fish meal, wheat bran, broken wheat, corn flour and vitamin mineral mixture in appropriate proportion. The tanks were fertilized uniformly by application of lime @300 kg ha-1 and mustard oil cake @750 kg ha^‑1. The recovery of carbon was highest in T1 (44.58%) followed by T3 (41.84%) and T2 (40.02%). At the time of harvest discharged water accounted for 44.37- 38.58% OC of the total inputs. Organic carbon accumulation increased in both the discharged water with increase in stocking density.