caa a22 4500 605464219 CHVBK 20210128100257.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10499-014-9817-z doi (NATIONALLICENCE)springer-10.1007/s10499-014-9817-z Effects of nitrate toxicity in the Pacific white shrimp, Litopenaeus vannamei , reared with biofloc technology (BFT) [Elektronische Daten] [Plínio Furtado, Bruno Campos, Fabiane Serra, Marta Klosterhoff, Luis Romano, Wilson Wasielesky Jr.] In cultures of the Litopenaeus vannamei with biofloc, the concentrations of nitrate rise during the culture period, which may cause a reduction in growth and mortality of the shrimps. Therefore, the aim of this study was to determine the effect of the concentration of nitrate on the growth and survival of shrimp in systems using bioflocs. The experiment consisted of four treatments with three replicates each: The concentrations of nitrate that were tested were 75 (control), 150, 300, and 600mg NO3 −-N/L. To achieve levels above 75mg NO3 −-N/L, different dosages of sodium nitrate (PA) were added. For this purpose, twelve experimental units with a useful volume of 45L were stocked with 15 juvenile L. vannamei (1.30±0.31g), corresponding to a stocking density of 333shrimps/m3, that were reared for an experimental period of 42days. Regarding the water quality parameters measured throughout the study, no significant differences were detected (p>0.05). Concerning zootechnical performance, a significant difference (p<0.05) was verified with the 75 (control) and 150 treatments presenting the best performance indexes, while the 300 and 600 treatments led to significantly poorer results (p<0.05). The histopathological damage was observed in the gills and hepatopancreas of the shrimps exposed to concentrations ≥300mg NO3 −-N/L for 42days, and poorer zootechnical performance and lower survival were observed in the shrimps reared at concentrations ≥300mg NO3 −-N/L under a salinity of 23. The results obtained in this study show that concentrations of nitrate up to 177mg/L are acceptable for the rearing of L. vannamei in systems with bioflocs, without renewal of water, at a salinity of 23. Springer International Publishing Switzerland, 2014 Litopenaeus vannamei nationallicence Toxicity nationallicence Nitrate nationallicence Bioflocs nationallicence Histology nationallicence Furtado Plínio Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut Campos Bruno Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut Serra Fabiane Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut Klosterhoff Marta Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut Romano Luis Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 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, CEP 96201-900, Rio Grande, RS, Brazil aut Aquaculture International Springer International Publishing 23/1(2015-02-01), 315-327 0967-6120 23:1<315 2015 23 10499 https://doi.org/10.1007/s10499-014-9817-z 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/s10499-014-9817-z 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, CEP 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 700 1- Campos Bruno Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 700 1- Serra Fabiane Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 700 1- Klosterhoff Marta Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 700 1- Romano Luis Marine Station of Aquaculture, Institute of Oceanography, Federal University of Rio Grande, C. P. 474, CEP 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, CEP 96201-900, Rio Grande, RS, Brazil aut NATIONALLICENCE 773 0- Aquaculture International Springer International Publishing 23/1(2015-02-01), 315-327 0967-6120 23:1<315 2015 23 10499