Biochemical effects of clomazone herbicide on piava (Leporinus obtusidens).
This study aims to verify the effects of the clomazone concentration used in rice fields on acetylcholinesterase (AChE), thiobarbituric acid reactive substances (TBARS), protein carbonyl and catalase activity in tissues of piava (Leporinus obtusidens). LC(50)-96h was 5.0 mg L(-1) and the fish were exposed to 1/10 of LC(50)-96 h: 0.5 mg L(-1) of clomazone for 96 and 192h. The same parameters were also assayed after a recovery period of 192 h in clean water. AChE activity was reduced only in the brain and heart of fish exposed for 96 h. AChE activity was decreased in the brain, muscle and heart tissues after 192 h of exposure. After 192 h of recovery period, AChE activity remained diminished in brain and muscle and showed a decrease in eye. However, after 192 h of recovery, AChE activity in heart was recovered. Fish showed increased TBARS levels in brain at all experimental periods. TBARS levels decreased in liver and muscle tissues after 192 h of exposure. The increase in muscle TBARS persisted in fish transferred to clean water. Protein carbonyl in the liver was increased in all periods studied including the recovery period. Catalase activity was reduced during all periods. The present study demonstrates the occurrence of disorders in AChE, TBARS, protein carbonyl and catalase activity in piava. The results also show changes in fish after exposure to an environmentally relevant concentration of clomazone. Most effects observed persisted after the recovery period. Thus, these parameters may be used to monitor clomazone toxicity in fish.
Miron
Denise dos Santos
Ddos S
Departamento de Química, Centro de Ciências Naturais, Universidade Federal de Santa Maria,Predio, Santa Maria, RS, Brazil.
Pretto
Alexandra
A
Crestani
Márcia
M
Glusczak
Lissandra
L
Schetinger
Maria Rosa
MR
Loro
Vânia Lúcia
VL
Morsch
Vera Maria
VM
D000110:Acetylcholinesterase / Q000378:metabolism; D000818:Animals; D002374:Catalase / Q000378:metabolism; D005399:Fishes / Q000378:metabolism*; D006540:Herbicides / Q000633:toxicity*; D007555:Isoxazoles / Q000633:toxicity*; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D009132:Muscles / Q000187:drug effects / Q000378:metabolism; D023303:Oxazolidinones / Q000633:toxicity*; D050050:Protein Carbonylation / Q000187:drug effects; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D006540:Herbicides; D007555:Isoxazoles; D023303:Oxazolidinones; D017392:Thiobarbituric Acid Reactive Substances; C095255:clomazone; D002374:Catalase; D000110:Acetylcholinesterase