摘要：An experiment was conduct to compare the performences of different carps i.e. rui (Labeo rohita), catla (Catla catla) and mrigal (Cirrhinus cirrhosus) in different stocking densities of polyculture. Three treatments each with three replicates were maintained and the stocking densities of carps were 80 (rui 30+ catla 30+ mrigal 20), 70 (25+25+20) and 60 (25+20+15) per decimal in T1, T2 and T3 respectively. Creeks were fertilized regularly; commercial feed was given for 300 days. The water quality parameter such as pH, temparature dissolved Oxygen and transperency were observed fortnightly. The obtained results showed that the highest weight was gained at 622.50±293.50 g in treatments T3 by catla, followed by rui (572.40±153.90 g) and mrigal (532.0±117.54 g). However, lowest weight gain was in treatment T1 for all species. On the other hand, the highest SGR was found in treatment T3 for rui (1.22±0.03) and the lowest SGR was in T1 for catla (0.89±0.04). Furthermore, the highest production was obtained in treatment T1 (468 kg/0.1ha/10 months or 4623 kg/ha/10months) followed by T2 (452 kg/0.1ha/months or 4465 kg/ha/10 months) and T3 (470 kg/0.1ha/months or 4643 kg/ha/10 months). Survival rate of T3 were highest for three species among the three treatments. The finding of this experiments revealed that, among three treatments, the stocking density of 60 fingerlings per decimal (T3) is the most suitable to ensure highest production on polyculture in creek.
