caa a22 4500 605464014 CHVBK 20210128100256.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10499-014-9819-x doi (NATIONALLICENCE)springer-10.1007/s10499-014-9819-x The effect of different alkalinity levels on Litopenaeus vannamei reared with biofloc technology (BFT) [Elektronische Daten] [Plínio Furtado, Luis Poersch, Wilson Wasielesky Jr.] The initial stages of rearing marine shrimp using biofloc technology (BFT) involve the biofloc formation process. At the same time, there is an increase in the levels of total suspended solids and a decrease in alkalinity and pH. This reduction of alkalinity and pH occurs due to the consumption of inorganic carbon by the autotrophic bacteria present in the bioflocs and biofilms. The aim of this study was to evaluate the effects of different alkalinities on water quality and the zootechnical performance of the marine shrimp Litopenaeus vannamei in a BFT system. The experiment consisted of four treatments, with three replicates each: 75, 150, 225 and 300mg CaCO3/L. To maintain the alkalinity at the established level, sodium bicarbonate was applied. For the experiments, twelve experimental units (area=0.20m2) with an effective volume of 50L were stocked with 30 juvenile L. vannamei (0.20±0.07g), to achieve a stocking density of 150 shrimps/m2 and were maintained for an experimental period of 49days. The 75 treatment presented the highest levels of ammonia and nitrite throughout the study, compared to the 150 and 300 treatments. The results showed that higher alkalinity favors biofloc formation and the establishment of nitrifying bacteria. Springer International Publishing Switzerland, 2014 Alkalinity nationallicence Litopenaeus vannamei nationallicence Bioflocs nationallicence Biofilm nationallicence Nitrogenous compounds nationallicence Furtado Plínio Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, 96201-900, Rio Grande, RS, Brazil aut Poersch Luis Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, 96201-900, Rio Grande, RS, Brazil aut Wasielesky Jr. Wilson Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, 96201-900, Rio Grande, RS, Brazil aut Aquaculture International Springer International Publishing 23/1(2015-02-01), 345-358 0967-6120 23:1<345 2015 23 10499 https://doi.org/10.1007/s10499-014-9819-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10499-014-9819-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Furtado Plínio Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 700 1- Poersch Luis Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 700 1- Wasielesky Jr Wilson Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 773 0- Aquaculture International Springer International Publishing 23/1(2015-02-01), 345-358 0967-6120 23:1<345 2015 23 10499