Effect of methyl parathion on the muscle and brain acetylcholinesterase activity of matrinxã (Brycon cephalus)

Abstract

Farming of the freshwater fish is emerging in Brazil and many species from the wild are promising. The teleost matrinxã (Brycon cephalus) holds several characteristics such as fast growth rate, high commercial value and adaptability to artificial raring conditions, which make it a promising species for commerce. The use of pesticides in aquatic environment is frequent in Brazil, and methyl parathion is very common in aquaculture. We have determined the enzymatic activity of acetyl cholinesterase in white muscle and brain of matrinxã exposed to 2ppm of environmental methyl parathion for 24 hours. There was 64% and 69% of acetyl cholinesterase inhibition in muscle and brain respectively. These activities were not recovered after 8 days from exposure to this pesticide. It can be concluded that acetyl cholinesterase from those tissues was inhibited by small amounts of methyl parathion, and the main effect was observed in the brain.

λ-Cyhalothrin and cypermethrin induce stress in the freshwater muddy fish,Clarias batrachus

“…The differential distribution of different molecular forms of AChE as well as their mode of interaction with pyrethroids might be another possible reason for observed patterns of AChE inhibition in different organs (Szegletes et al 1995). The differential degree of nerve innervations in these organs might be one of the reasons for organ specific differences (Almeida, Aguiar, and Moraes 2005). In addition, earlier reports on AChE activity inhibition due to pyrethroids exposure in Cyprinus carpio are in agreement with our findings (Jebakumar, Flora, and Ganesan 1990;Reddy, Philip, and Bashamohideen 1992;Reddy and Philip 1994).…”

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“…AChE activity was characterized in brain, muscle and liver (Bretaud et al, 2000;Almeida et al, 2005;Halappa and David, 2009;Modesto and Martinez 2010). Reports regarding comparative effects ofpesticide on the blood and liver of the fish are scanty.…”

Studies on Impact of Cypermethrin on Acid and Alkaline Phosphatase Activity in the Selected Organs of Fresh Water Fish Cirrhinus Mrigala (Hamilton) and the Protective Effect of Cardiospermum Halicacabum

“…According to 5 , biochemical changes occurs in fishes that are exposed to environmental contaminants, such changes may include pesticides and their metabolites have necessitated a number of studies to determine their effects in aquatic environment on biochemical parameters in fish 6 . Several authors have investigated the effect of pesticide in fish [6][7][8]4 . The ACP and ALP are active at specific pH and are usually termed phosphomonoesterases.…”