Abstract
The objective of this study was to evaluate the productive performance, organosomatic indices and liver-intestinal histomorphometric parameters of Nile tilapia (Oreochromis niloticus) juveniles, fed diets containing probiotics (yeast - Saccharomyces cerevisiae) and reared at different densities of storage. In this experiment, 450 juveniles of tilapia (2.9 ± 0.23 g) were distributed in 18 experimental units arranged in RAS and arranged in a randomized block design in a 2x3 factorial scheme. These animals were fed two diets, the first without yeast and the second containing 0.1% yeast inclusion and distributed in three stocking densities of 15, 25 and 35 fish / m3 (500, 833 and 1166 fish / m3). There was an improvement in the oxygenation of the medium with the use of yeast, as well as in the lowest stocking densities evaluated (15 and 25 fish / m³). However, lower specific growth rates and higher viscerosomatic index were observed in animals supplemented with 0.1% yeast. For the average area of hepatocytes, there was an interaction between the evaluated factors (use of probiotic x storage density), where the best values were found in the lowest storage densities (15 and 25 fish / m³), regardless of use or not of the probiotic. It is recommended to use a stocking density of 15 to 25 fish / m³ and a supplementation of 0.1% with yeast as a probiotic, in order to improve liver health and oxygenation of the water used to grow Nile tilapia juveniles cultivated in RAS.
Highlights
Aquaculture is the fastest growing activity in comparison to other agricultural food production sectors (FAO, 2018).From 2001 to 2018, world aquaculture production grew by more than 5% per year, according to data from the State of TheWorld Fisheries and Aquaculture - SOFIA, reaching over 82.1 million tons of fish in the last year
The aim of this study was to evaluate the inclusion of a probiotic composed by S. cerevisiae yeast and different stocking densities in the growth development, somatic indexes and hepaticintestinal histomorphometry of Nile tilapia juveniles, in a water recirculation system during the pre-fattening stage
3.1 Water Quality The water quality parameters evaluated in this study did not show any interaction with stocking density or with the addition of the probiotic (p > 0.05); significant differences were found when these were individually evaluated (Table 2)
Summary
Aquaculture is the fastest growing activity in comparison to other agricultural food production sectors (FAO, 2018).From 2001 to 2018, world aquaculture production grew by more than 5% per year, according to data from the State of TheWorld Fisheries and Aquaculture - SOFIA, reaching over 82.1 million tons of fish in the last year. Aquaculture is the fastest growing activity in comparison to other agricultural food production sectors (FAO, 2018). Brazil is currently the 13th largest fish producing country in the world (FAO, 2020), and the incessant search for alternatives aimed at improvements in the aquaculture sector, such as in fish nutrition, is a constant challenge for this activity and for fish farmers (MPA, 2015). Tilapia is the second most produced species in the world but the most cultivated species in Brazil (FAO, 2020; PeixeBR, 2020) due to its favorable traits, such as good acceptance by consumers, rusticity, rapid growth and meat quality (Meurer et al, 2003; 2008). According to Filipetto et al (2015), proper nutrition during this developmental stage, when fish grow at accelerated rates (Hayashi et al, 2002), can ensure an effective nutritional support for its growth and health maintenance (Kim et al, 2003). The provision of a balanced diets containing food additives might be an efficient strategy to mitigate losses in this stage and provide additional benefits in subsequent phases (Hayashi et al, 2002)
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