期刊名称：Research Journal of Animal, Veterinary and Fishery Sciences
电子版ISSN：2320-6535
出版年度：2015
卷号：3
期号：6
页码：1-6
语种：English
出版社：International Science Community Association
摘要：The study was conducted to evaluate the growth potential of pacu, Piaractus brachypomus in monoculture and polyculture system with feeding, fertilization and substrate addition. The experiment was carried out for 120 days in outdoor circular cement cistern of 380 litre capacity. The culture strategies/treatments employed are monoculture of pacu with feeding alone (T1), monoculture of pacu, with fertilization alone (T2), polyculture of pacu with Indian major carps with feeding alone (T3), polyculture of pacu with Indian major carps with fertilization alone (T4) and polyculture of pacu with Indian major carps in periphyton based system (T5). Each treatment was subjected to three replication. In case of monoculture a total numbers of 10 fishes were stocked in each cistern. Where as in case of polyculture pacu, catla, rohu and mrigal were stocked in the proportion 3:2:3:2 respectively. In treatment involving feed, feeding was done with locally available conventional feed with overall protein content of 30% and given at the rate of 10% of body weight daily. In the treatments involving fertilization, and substrate all tanks were initially fertilized with raw cow dung of 150g in combination with 2 g of urea. Subsequent fertilization of 1/4th of the initial level was done fortnightly. Coconut spadix in mat form was used as a substrate for periphyton growth. Fish were sampled every fortnightly for weight gain measurements. All the water quality parameters were within the desirable range. Mean weight gain of pacu in monoculture was 29.58g (T1) and 17.33g (T2). In polyculture mean weight gain of pacu, was 27.13g (T3), 16.48g (T4) and 18.29g (T5).Mean survival rate of pacu was good in all treatment with average value ranging from 83.33 % (T1) to 100% (T5). Inclusion of pacu along with Indian major carps does not have any impact on the survival rate of catla, rohu and mrigal. Highest mean specific growth rate of pacu was recorded in T3 (2.16). The result of this experiment indicates that the best growth performance of pacu was in monoculture with feeding. In polyculture the best growth performance of pacu was obtained with feeding alone followed by periphyton based system. The present study concluded that pacu is a promising candidate species in freshwater aquaculture. Monoculture with feeding is a feasible approach. Monoculture in fertilized systems is less productive. Pacu is a compatible species for culturing along with Indian major carps. Growth of pacu is higher in fertilized systems with added substrates.
