Effect of nitrite on larval development of giant river prawn Macrobrachium rosenbergii
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
11/12/2006
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Resumo |
The effects of ambient nitrite concentrations on larval development of giant river prawn Macrobrachium rosenbergii were evaluated. The trials were conducted in two phases: phase 1, larvae from stages I through VIII and phase 2, larvae from stage VIII until post-larvae. In both phases larvae were kept in water with nitrite (NO2-N) concentrations of 0, 2, 4, 8 and 16 mg/L. Oxygen consumption was analyzed for larvae in stage II at nitrite concentrations of 0, 4, and 8 mg/L. Survival, weight gain, larval stage index and metamorphosis rate decreased linearly with increasing ambient nitrite concentration. However, there was no significant difference between larvae subjected to 0 and 2 mg/L NO2-N. In phase 1, there was total mortality at 16 mg/L NO2-N, while in phase 2 larval development stopped at stage X in this treatment. The oxygen consumption in stage II increased significantly at NO2-N concentration from 0 to 4 mg/L, but there was no difference between 4 and 8 mg/L NO2-N. In conclusion, increasing ambient nitrite up to 16 mg/L NO2-N delays larval development, reduces larval growth rate and causes mortality, whereas no significant effect occurs for levels below 2 mg/L NO2-N. However, the establishment of a general safe level of nitrite to M rosenbergii hatchery may be difficult due to the great variability in larvae individual sensitivity. (c) 2006 Elsevier B.V. All rights reserved. |
Formato |
1292-1298 |
Identificador |
http://dx.doi.org/10.1016/j.aquaculture.2006.07.048 Aquaculture. Amsterdam: Elsevier B.V., v. 261, n. 4, p. 1292-1298, 2006. 0044-8486 http://hdl.handle.net/11449/944 10.1016/j.aquaculture.2006.07.048 WOS:000243289400022 |
Idioma(s) |
eng |
Publicador |
Elsevier B.V. |
Relação |
Aquaculture |
Direitos |
closedAccess |
Palavras-Chave | #freshwater prawn #larvae #Macrobrachium #nitrite |
Tipo |
info:eu-repo/semantics/article |