Abstract
The effects of supplying dried bioflocs biomass to Nile tilapia juveniles were investigated in the present work. Fish were stocked in experimental rearing tanks for eight weeks. Selected variables of water quality, growth performance and effluent quality were evaluated. Fish were given different combinations of artificial diets and biofloc biomass, in wet (in natura) or dry form. As the supply of artificial diet decreased, the allowance of biofloc biomass increased in the same proportion. Biofloc biomass was produced in two 500-L tanks that received daily applications of dry molasses to adjust the C: N ratio of the water to 15: 1. The concentration of nitrite in water was only reduced in the tanks receiving wet bioflocs. The fish growth performance was poorer in the tanks that received dried biofloc biomass than in the tanks with wet biofloc biomass. Given the lack of positive results, there is no justification to dry the biofloc biomass aiming at delivering it as a dry biomass to reared fish.
Highlights
The bioflocs technology (BFT) in aquaculture has proven to be an important source of nutrition for the rearing animals, helping to maintain water quality and preventing diseases (Ballester et al, 2010)
This study aimed at determining the effects of the supply of dried bioflocs biomass to Nile tilapia juveniles maintained in experimental tanks on selected variables of water quality, growth performance and effluent quality
There were no significant differences between the treatments for pH, dissolved oxygen, total ammonia nitrogen (TAN), NH3, reactive phosphorus and organic matter (Table 2)
Summary
The bioflocs technology (BFT) in aquaculture has proven to be an important source of nutrition for the rearing animals, helping to maintain water quality and preventing diseases (Ballester et al, 2010). According to Xu and Pan (2012) the bioflocs are available 24 hours a day as a food source and can supply a significant part of the nutritional demand of farmed animals. Fish and shrimp diets supplemented with bioflocs can improve growth (Anand et al, 2014). Animal Sciences natural food in the farming system, such as the bioflocs. The aquaculture feeding costs can be reduced by adoption of the BFT system, since the expenses with commercial diets account for more than 50% of the production operating costs (Chamberlain, Avnimelech, McIntosh & Velasco, 2001)
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