Dimethoate 40% organosphosphorous pesticide toxicity in Prochilodus lineatus (Prochilodontidae, Characiformes) eggs and larvae

Dimethoate 40% organosphosphorous pesticide toxicity in Prochilodus lineatus (Prochilodontidae, Characiformes) eggs and larvae

Toxicity tests using early life stages of fish are of great importance in assessing risks to growth, reproduction and survival in polluted environments and are important tools for good environmental monitoring. However, a small number of standard bioassays of this type have been developed in Brazil....

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Bibliographic Details
Published in:Brazilian journal of biology Vol. 66; no. 2B; pp. 633 - 640
Main Authors: Campagna, A F, Eler, M N, Espíndola, E L G, Senhorini, J A, do Rêgo, R F, Silva, L O L
Format: Journal Article
Language:English
Published: Brazil Instituto Internacional de Ecologia 01-05-2006
Subjects:
Animals
bioassay
BIOLOGY
Characiformes
Dimethoate - toxicity
fishes
Fishes - growth & development
Insecticides - toxicity
Larva - drug effects
larvae
Lethal Dose 50
Ovum - drug effects
pesticide
Prochilodontidae
Prochilodus lineatus
toxicity
Toxicity Tests
toxicity
bioensaios
toxicidade
pesticide
larva
bioassay
larvae
pesticida
fishes
peixes
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Summary:Toxicity tests using early life stages of fish are of great importance in assessing risks to growth, reproduction and survival in polluted environments and are important tools for good environmental monitoring. However, a small number of standard bioassays of this type have been developed in Brazil. Curimbatá (Prochilodus lineatus) is an abundant South American characid fish of great commercial interest. It was chosen for testing different concentrations of 40% dimethoate, an organophosphate insecticide and acetylcholinesterase enzyme (AChE) inhibitor used widely in Brazil. The 48-h LC50 for eggs is higher than 16.0 microg.L-1, whereas for recently hatched larvae it was found to be significantly lower (11.81 microg.L-1, ranging between 10.23 microg.L-1 - 13.65 microg.L-1) and also significantly lower than that for eggs by a Student t-test for independent samples (p = 0.03). The 96-h LC50 for 3-day old larvae was 10.44 microg.L-1 (8.03 microg.L-1 - 13.57 microg.L-1), similar to that of recently-hatched larvae (p = 0.76). Larval mobility was also found to be reduced by this insecticide.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1519-6984
1678-4375
1519-6984
DOI:10.1590/S1519-69842006000400007