Abstract
The present study aimed to analyze the growth of Chlorella vulgaris in the effluent of a Biofloc Technology (BFT) system used in the Nile tilapia fingerlings farming. The conditions were cultivated by 10 days at 25 ± 2ºC, 90 μmol photons m−2 s−1 irradiance, under constant aeration (without addition of CO2), and with different BFT effluent proportions (0, 50, and 100%). After 24 hours of the inoculation that marked the beginning of the experiment, the development and multiplication of the cells were verified, demonstrating that the BFT effluent used in the Nile tilapia farming was favorable for the cultivation of the microalga Chlorella vulgaris. As expected, the Provasoli culture medium presented the best performance (1,520 ± 75 104 cells mL-1) in relation to the growth of the microalga. However, during the first four days of cultivation, C. vulgaris showed higher growth in treatments containing BFT effluent. C. vulgaris removed 93.6% of the nitrate contained in the BFT effluent. The results of the present study showed the potential use of C. vulgaris on Integrated Multi-Trophic Aquaculture with Nile tilapia fingerlings. In addition to removing nitrate and other nitrogen compounds, C. vulgaris biomass could be used to feed zooplankton or Nile tilapia larvae.
Highlights
Received on January 14, 2019 Accepted on April 27, 2019Tilapia is a tropical species that has shown rapid growth and high adaptability to distinct environmental conditions
The tilapia culture in cage farming systems is the most applied method worldwide, since the fish has a good growth when fed with acceptable protein levels (Costa & Fróes, 2012)
The aquatic organisms farming in Biofloc Technology (BFT) systems are one of the bets in aquaculture to combat hunger (Vinatea, 2010; FAO, 2016)
Summary
Received on January 14, 2019 Accepted on April 27, 2019Tilapia is a tropical species that has shown rapid growth and high adaptability to distinct environmental conditions. The tilapia culture in cage farming systems is the most applied method worldwide, since the fish has a good growth when fed with acceptable protein levels (Costa & Fróes, 2012). 75% of the feed-N and 50-70% of feed-P ends up in the water (Crab, Defoirdt, Bossier, & Verstraete, 2012; Lima et al, 2019) This accumulation is due to one of the main characteristics of this system, the stagnant water system (Mishra et al, 2008; Krummenauer, Cavalli, Poersck, & Wasielesky, 2011). The biomass produced from this process can be used in several purposes Among other applications, it is worth mentioning the feed of aquatic organisms and the high value products that result from this process (Dantas et al, 2019)
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