Sub-lethal effects of the organophosphate folidol 600 (methyl parathion) on Callichthys callichthys (pisces:teleostei)

Silva, Helena Cristina da; Medina, Heitor; Fanta, Edith; Bacila, Metry

doi:10.1016/0742-8413(93)90194-p

Cited by 36 publications

(22 citation statements)

References 12 publications

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“…anguilla exposed to fenitrothion exhibited greater decreases in brain AChE activity at longer exposure times and higher concentrations of fenitrothion. Such a dose-time response has also been found for a variety of other OP insecticides (Morgan et al, 1990;Høy et al, 1991;Da Silva et al, 1993;Ceron et al, 1996). Exposure to 0.04 ppm fenitrothion produced a 64% decline in AChE activity at 96 h exposure, whereas 0.02 ppm of fenitrothion produced only a 44% reduction in AChE at 96 h. Similar findings have been described by Ceron et al (1996) in the brain of A. anguilla exposed to diazinon.…”

Section: Discussionmentioning

confidence: 75%

Response and Recovery of Brain Acetylcholinesterase Activity in the European Eel,Anguilla anguilla,Exposed to Fenitrothion

Sancho

Ferrando

Andreu

1997

Ecotoxicology and Environmental Safety

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Section: Discussionmentioning

confidence: 75%

Response and Recovery of Brain Acetylcholinesterase Activity in the European Eel,Anguilla anguilla,Exposed to Fenitrothion

Sancho

Ferrando

Andreu

1997

Ecotoxicology and Environmental Safety

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“…Unfortunately, their high biochemical speci"-city has resulted in the development of resistance in many insect and mite pests (Roush and McKenzie, 1987;Taylor and Feyereisen, 1996). Furthermore, most OPs are also toxic to nontarget organisms (Da Silva et al, 1993;Detra and Collins, 1991) and some appear to have relatively high environmental persistence (Eto, 1974). Thus, in the same manner as resistance development among target pests, populations of nontarget organisms living near areas sprayed with OPs could become adapted by developing increased resistance.…”

Section: Introductionmentioning

confidence: 99%

Biochemical Factors Contributing to Response Variation among Resistant and Sensitive Clones of Daphnia magna Straus Exposed to Ethyl parathion

Barata

Baird

Soares

et al. 2001

Ecotoxicology and Environmental Safety

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“…The inhibition of AChE is the most critical toxic effect because it results in the accumulation of the neurotransmitter acetylcholine in the synapsis, interrupting the neural transmission. Although substantial reductions in the activity of AChE of the brain of fish have not been fatal, the effect of this condition on activities as feeding, reproduction and relationships prey-predator is not known (EPA, 1986;Silva et al, 1993).…”

Section: *Loov Duh Ylwdo Vwuxfwxuhv Iru Ilvk Vlqfh Wkh\ Duh Wkh Pdlq mentioning

confidence: 99%

Effects of the organophosphorous methyl parathion on the branchial epithelium of a freshwater fish Metynnis roosevelti

Machado

Fanta

2003

Braz. arch. biol. technol.

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Gills are vital structures for fish, since they are the main site for gaseous exchange as well as partially responsible for osmorregulation, acid-basic balance, excretion of nitrogenous compounds and taste. Chemicals in the water may alter the morphology of branchial cells of fish that are, therefore, a useful model for environmental impact and ecotoxicology studies. In order to investigate the effects of an organophosphorous compound, methyl parathion, on the gills of the fish, samples of Metynnis roosevelti were exposed to lethal (7ppm) and sublethal (1ppm) doses of Mentox 600 CE. Through light and scanning electron microscopy, shrinking of the branchial epithelium, followed by detachment and hyperplasia were observed. Externally, the branchial filaments presented the gradual disappearance of microridges. Even in sublethal doses, the organophosphorous reduced the health and fitness of these fish, as consequence of secondary effects derived from changes in the branchial epithelium, impairing oxygenation and ionic balance of the organism.
As brânquias são estruturas vitais para peixes, pois são o principal local de trocas gasosas, assim como parcialmente responsáveis pela osmorregulação, pelo equilíbrio ácido-básico, pela excreção de compostos nitrogenados e pela gustação. Compostos químicos na água podem alterar a morfologia das células branquiais de peixes, que se constituem, dessa forma, em um útil modelo para estudos de impacto ambiental. Visando investigar os efeitos de um composto organofosforado, o metil paration, em brânquias de peixes, exemplares de Metynnis roosevelti foram expostos a doses letais (7ppm) e subletais (1ppm) de Mentox 600 CE. Observações em microscopia óptica e eletrônica de varredura evidenciaram enrugamento do epitélio branquial, seguido por descolamento e hiperplasia. Externamente, os filamentos branquiais apresentaram desaparecimento gradual das microssaliências. Os resultados mostram que, mesmo em doses subletais, o organofosforado poderá levar o animal a sofrer conseqüências secundárias decorrentes das alterações da superfície de trocas gasosas e iônicas

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Sub-lethal effects of the organophosphate folidol 600 (methyl parathion) on Callichthys callichthys (pisces:teleostei)

Cited by 36 publications

References 12 publications

Response and Recovery of Brain Acetylcholinesterase Activity in the European Eel,Anguilla anguilla,Exposed to Fenitrothion

Response and Recovery of Brain Acetylcholinesterase Activity in the European Eel,Anguilla anguilla,Exposed to Fenitrothion

Biochemical Factors Contributing to Response Variation among Resistant and Sensitive Clones of Daphnia magna Straus Exposed to Ethyl parathion

Effects of the organophosphorous methyl parathion on the branchial epithelium of a freshwater fish Metynnis roosevelti

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