Abstract
The efficacy and suitability of dietary whole wheat flour supplementation was evaluated on the growth performance and survival of rohu (Labeo rohita). The study was conducted in 12 experimental aquaria at the Wet Laboratory, Department of Aquaculture, Bangladesh Agricultural University, Mymensingh. A total of 180 fingerlings of mean initial weight of 1.744±00 g were stocked at the same stocking density (268 fingerlings/m3). Four different treatments (T1, T2, T3 and T4) each with three replications were performed having different level of whole wheat flour such as 0% whole wheat flour (T1), 5% whole wheat flour (T2), 10% whole wheat flour (T3) and 15% whole wheat flour (T4). Feeds were supplied at 5% body weight twice daily in the morning at 9.00 am and in the afternoon at 5.00 pm throughout the study period. The rations were adjusted every week when new weights of the fish for various experimental aquariums were determined. At the end of the 63 days study period, the growth performance parameters such as mean final weight (g), weight gain (g), percent weight gain (%), specific growth rate (%/day) and the best feed utilization in terms of food conversion ratio were found highest at treatment 4 where fishes were fed with inclusion of 15% whole wheat flour and lowest was found at treatment 1 (fed with inclusion of 0% whole wheat flour). Water quality parameters were within the acceptable range and survival rate was found 100% in all treatment. Therefore, it can be concluded that treatment 4 (highest growth performance and survival rate of L. rohita with supplementation of 15% whole wheat flour containing diet) can be chosen by fish farmers for commercial culture of this species.
 Res. Agric., Livest. Fish.6(2): 345-352, August 2019
Highlights
Fish is considered as second valuable agricultural product and the aquaculture sector is playing a significant role in our national economy, nutrition, employment, income generation and foreign currency earning
The mean weight gain of experimental fish was found highest in T4 followed by T2, T3 and T1, respectively (Table 3)
Percent weight gain (%) The percent weight gain (%) of fish in different treatments ranged from 74.28±5.93% to 127.06±4.04%
Summary
Fish is considered as second valuable agricultural product and the aquaculture sector is playing a significant role in our national economy, nutrition, employment, income generation and foreign currency earning. Bangladesh has recorded surplus fish production with an annual output of 41.34 lakh metric tons against a demand of 40.50 lakh metric tons in 2016-17 where aquaculture contributes 56.44 percent to total production. It contributes 3.61 percent to our national GDP and around one-fourth (24.41 percent) to the agricultural GDP and the country earns BDT 42876.40 million by exporting almost 68.31 thousand MT of fish and fisheries products in 2016-2017 (DoF, 2017).Bangladesh is ranked third in producing fish from inland water-bodies (10.48 lakh metric tons) and the fifth biggest aquaculture producer (22 lakh metric tons) and 11th marine producer (1.13 lakh metric tons) in the world (FAO, 2018). Though fiber is the source for prebiotics, foods that are high in fiber are typically high in prebiotics, should be used in feed formulation
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