| Registro completo |
| Provedor de dados: |
Neotropical Ichthyology
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| País: |
Brazil
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| Título: |
Survival, growth and metabolic parameters of silver catfish, Rhamdia quelen, juveniles exposed to different waterborne nitrite levels
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| Autores: |
Lima,Ronaldo L. de
Braun,Neiva
Kochhann,Daiani
Lazzari,Rafael
Radünz Neto,João
Moraes,Bibiana S.
Loro,Vania L.
Baldisserotto,Bernardo
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| Data: |
2011-03-01
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| Ano: |
2011
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| Palavras-chave: |
Nitrogenous compound
Jundiá
Glucose
Lactate
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| Resumo: |
High nitrite (NO2-) levels may develop in aquaculture systems due to high fish density, but studies of lethal concentration values and the effect of NO2- on metabolic parameters and growth are scarce. Consequently, in this study was verified the lethal concentration at 96 h (LC50-96h) for (NO2-) in juvenile silver catfish, Rhamdia quelen and the effect of four waterborne NO2- concentrations (0.06, 0.46, 1.19, and 1.52 mg.L-1) on growth, and hepatic and muscular lactate, glucose, glycogen and protein. Nitrite LC50-96h was 20.46 (confidence interval: 16.10-23.68) mg.L-1. In the growth experiment, exposure to NO2- did not affect weight, length or specific growth rate, but due to mortality (66.7% and 100% after 20 and 40 days, respectively), biomass of juveniles exposed to 1.52 mg.L-1 NO2- was significantly lower than the biomass of juveniles exposed to other treatments. Therefore, the safe level of nitrite for growth of silver catfish juveniles is below 1.19 mg.L-1 (2% of LC50-96h). Exposure of silver catfish to NO2- for 40 days reduced lactate levels in muscle, but lactate levels increased in liver tissue of fish maintained at 1.19 mg.L-1 NO2-. In addition, glucose levels in muscle and liver tissues were significantly lower in silver catfish exposed to the highest NO2- level. These results indicate that chronic NO2- exposure causes anaerobic substrate oxidation to meet energy demand.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100013
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| Editor: |
Sociedade Brasileira de Ictiologia
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| Relação: |
10.1590/S1679-62252011005000004
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| Formato: |
text/html
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| Fonte: |
Neotropical Ichthyology v.9 n.1 2011
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| Direitos: |
info:eu-repo/semantics/openAccess
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