Studies on the growth and production performance of Rohu (Labeo rohita) at different stocking densities in intensive aquaculture systems using floating feed

The study was conducted to assess the growth and production of rohu (Labeo rohita) in intensive aquaculture system in relation to feed conversion ratio (FCR). To assess the weight gain, SGR and FCR, the experiment was performed in six concrete tanks under a shed located on the southern corner of Faculty of Fisheries, BAU for 100 days from 26th June to 3rd September, 2018. Rohu fry was released at the rate of 4 fry per tank equivalent to the stocking density of 160 fishes/decimal for treatment 1 (T1) and at the rate of 8 fry per tank equivalent to the stocking density of 320 fishes/decimal for treatment 2 (T2). Floating feeds were used for feeding the fish in both treatments. There were three (3) replications for each treatment. During experimental period, feed was given at the rate of 12%, 8%, and 4% of the body weight in first 30 days, second 30 days and final 40 days, respectively. The weight gains of fish were 42.89±1.509 g and 23.49±4.039 g for T1 and T2, respectively. The mean percent weight gain of rohu was higher in T1 (588.12±0.00) than T2 (319.29±0.00). Feed conversion ratio (FCR) in T1 and T2 were 2.21 and 2.99, respectively. The specific growth rate (SGR) of rohu in T1 and T2 were 1.92±0.275 and 1.43±0.108, respectively. The SGR for T1 was higher and FCR was lower in production cycle than T2. The total production was obtained 201.56±0.00 g in T1 and 248.08±0.00 g in T2, respectively with 100% survival rate in both the treatments.