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Effects of copper and zinc on growth, feeding and oxygen consumption of Farfantepenaeus paulensis postlarvae (Decapoda: Penaeidae).
MedLine Citation:
PMID:  10742507     Owner:  NLM     Status:  Publisher    
The effect of chronic exposure (35 days) to sub-lethal concentrations of copper (17-212 ppb) and zinc (41-525 ppb) on growth of Farfantepenaeus paulensis postlarvae 17 days old (PL(17)) was analysed. The effects of acute exposure of PL(17) to the same metal on food ingestion and oxygen consumption were also evaluated. Studies were performed using copper and zinc singly, and in a mixture of equipotent concentrations (1:2.5). Chronic exposure to copper (85 and 212 ppb) and zinc (106, 212 and 525 ppb) reduced PL(17) growth. Acute exposure to copper (212 ppb) and zinc (525 ppb) reduced the number of Artemia sp. predated during 30 min and the positive feeding response induced by L-isoleucine. Despite of the lower positive feeding response when PL(17) were exposed to zinc, a significant difference from control condition was not seen. Oxygen consumption was reduced by all copper and zinc concentrations tested. The mean reduction was approximately 32%. The copper zinc-mixture did not modify food consumption and feeding response, or the oxygen consumption of the PL(17). The inhibition of food and oxygen consumption induced by copper and zinc could explain, at least in part, the long-term reduction of growth observed in chronically exposed PL(17). Our results also suggest that the inhibition of food consumption induced by copper is possibly due to an effect on chemosensory mechanisms. Finally, an antagonism between copper and zinc was observed, when were employed to analyse feeding behaviour and aerobic metabolism after acute exposure.
Santos; Troca da Cunha N; Bianchini
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Publication Detail:
Journal Detail:
Title:  Journal of experimental marine biology and ecology     Volume:  247     ISSN:  -     ISO Abbreviation:  J. Exp. Mar. Biol. Ecol.     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-03-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9879543     Medline TA:  J Exp Mar Bio Ecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  233-242     Citation Subset:  -    
Laboratório de Zoofisiologia, Departamento de Ciências Fisiológicas, Fundação Universidade Federal do Rio Grande, Caixa Postal 474, CEP 96201-900, Rio Grande, Brazil
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