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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Acute toxicity of ammonia on juvenile cobia (Rachycentron canadum, Linnaeus, 1766) according to the salinity

Texto completo
Autor(es):
Barbieri, Edison [1] ; Doi, Sonia Assami [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] SAA SP, APTA, Inst Pesca, BR-11990000 Cananeia, SP - Brazil
[2] SAA SP, APTA, Inst Pesca, Programa Posgrad, BR-05001900 Sao Paulo - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: AQUACULTURE INTERNATIONAL; v. 20, n. 2, p. 373-382, APR 2012.
Citações Web of Science: 16
Resumo

Juvenile cobia (Rachycentron canadum) (total length 15.16 +/- 0.92 cm and weight 19.26 +/- 4.5 g) were exposed to different concentrations of ammonia-N (unionized plus ionized ammonia as nitrogen), using the static renewal method at different salinity levels of 5, 20, and 35% at pH 8.1 and 25 degrees C. The 24, 48, 72, 96 h LC50 values of ammonia-N for R. canadum juveniles were 60.28, 48.57, 37.42, 22.73 mg l(-1) at 35%; 51.25, 43.63, 28.17, 19.05 mg l(-1) at 20%; and 39.48, 25.31, 19.50, 8.13 mg l(-1) at 5%, respectively. The 24, 48, 72, 96 h LC50 values of NH3-N (unionized ammonia as nitrogen) were 1.81, 1.46, 1.12, and 0.68 mg l (1) at 35%; 1.75, 1.49, 0.96, and 0.65 mg l(-1) at 20%; and 1.52, 0.97, 0.71, and 0.31 mg l(-1) at 5%, respectively. As the salinity decreased from 35 to 5%, susceptibility of ammonia-N increased by 34.5, 47.88, 50.56, and 64.23% after 24, 48, 72, and 96 h exposure, respectively. Furthermore, we found that exposure of fish to ammonia-N caused an increase in oxygen consumption of 129.1, 157.5, and 192% and a decrease in the ammonia excretion level of 53.4, 38.2, and 23.3% with respect to the control. (AU)

Processo FAPESP: 07/50147-7 - Efeito do zinco e cádmio sobre o camarão rosa (Farfantepenaeus paulensis Pérez-Farfante, 1967, Decapoda, Peneidae, Crustacea), em três temperaturas e salinidade diferentes
Beneficiário:Edison Barbieri
Linha de fomento: Auxílio à Pesquisa - Regular