Segment Specificity of the Cytological Response in Rainbow Trout (Oncorhynchus mykiss) Renal Tubules Following Prolonged Exposure to Sublethal Concentrations of Atrazine

Oulmi, Y.; Negele, Rolf-Dieter; Braunbeck, Th.

doi:10.1006/eesa.1995.1083

Cited by 37 publications

(30 citation statements)

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“…Para Oulmi et al (1995), a exposição da espécie de truta Oncorhynchus mykiss ao atrazina resultou em 50% de mortalidade em concentração próxima a 10 mg L -1 ; contudo, no teste com embriões desse mesmo peixe esse valor diminuiu para 1 mg L -1 . Para Prassad & Reddy (1994) (Kreutz et al, 2008).…”

Section: Resultsunclassified

Toxicidade aguda de herbicidas a tilápia (Oreochromis niloticus)

et al. 2009

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RESUMO -Esta pesquisa teve como objetivo avaliar a sensibilidade de alevinos de Oreochromis niloticus a diversos herbicidas. Para isso, foram realizados dois ensaios, sendo, no primeiro, avaliadas concentrações de atrazina (0; 2,5; 5; 10; e 20 mg L -1 ), visando a determinação da concentração letal a 50% dos indivíduos (CL 50 ), e, no segundo, a sensibilidade às mesclas dos herbicidas alachlor + atrazina (5,33 + 5,33 mg L -1 ), diuron + MSMA (5,33 + 2,13 mg L -1 ), paraquat (1,33 mg L -1 ) e 2,4-D + picloram (1,28 + 0,34 mg L -1 ), com contagem de mortes 96 horas após exposição aos produtos. No primeiro ensaio foi observado elevado declínio na sobrevivência dos alevinos a partir de 3 mg L -1 do herbicida atrazina, com CL 50 estimada de 5,02 mg L -1 . No segundo, a mistura alachlor + atrazina promoveu o maior efeito de mortalidade sobre os alevinos de tilápia. Com 72 horas de exposição, a escala de intoxicação evidenciou redução nos números de indivíduos de, aproximadamente, 17,4% para os produtos paraquat, 2,4-D + picloram e diuron + MSMA e de 100% para alachlor + atrazina. Os dados permitem concluir que a CL 50 obtida para o atrazina é inferior àquela mencionada como tóxica para truta e que a mistura alachlor + atrazina pode ser caracterizada como de risco para O. niloticus, mesmo quando aplicada em doses normais de uso.Palavras-chave: alachlor, atrazina, 2,4-D, diuron, paraquat, picloram.ABSTRACT -Two assays were carried out to evaluate Oreochromis niloticus sensitivity to different herbicides. In the first experiment, atrazin concentrations (0; 2.5; 5; 10 and 20 mg L -1 ) were evaluated aiming to determine lethal concentration (LC50) to O. niloticus. In the second assay, the effects of the herbicide mixtures alachlor + atrazin (5.33 + 5.33 mg L -1 ), diuron + MSMA (5.33 + 2.13 mg L -1 ), paraquat (1.33 mg L -1 ) and 2,4-D + picloran (1.28 + 0.34 mg L -1 ), were evaluated on O. niloticus survival after 96 h of exposure. In the first assay, a sharp decrease in fingerlings survival was observed from 3 mg L -1 of atrazin with CL 50 value of 5.02 mg L -1 and a high biomass decrease due to herbicide presence. In the second assay, a greater negative effect was observed on fingerlings by alachlor + atrazin. . After 72 h of incubation, intoxication rate showed a reduction in the number of individuals of 17.4% for paraquat, 2,4 D + picloram and diuron + MSMA, and of 100% for alachlor + atrazin. It was concluded that CL 50 obtained for atrazin is inferior to that listed as toxic to trouts and that the alachlor + atrazin mixture can be characterized as a risk to O. niloticus, even when applied at commercially recommended rates.

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Section: Resultsunclassified

Toxicidade aguda de herbicidas a tilápia (Oreochromis niloticus)

et al. 2009

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“…, and concentrations as low as 10μg L -1 caused kidney damage in chronic exposed rainbow trout (OULMI et al, 1995). For Tilapia mossambicus, the atrazine 96-h LC 50 was 8.8mg L -1 (PRASSAD & REDDY, 1994); chronic exposure effects were tested on Tilapia using 1/8 of this dose and several disturbances in osmotic balance of exposed fish were found.…”

Section: Discussionmentioning

confidence: 98%

“…Taken together, the low 96-h LC 50 , combined with the strong behavioral changes and the fact that Folidol is frequently used directly in water, indicate that methyl-parathion is a potentially harmful compound for fish, including R. quelen. Atrazine is one of the most widely used herbicides and, because of its considerable persistence and mobility in soil and water, it is considered a common terrestrial and aquatic contaminant (OULMI et al, 1995). The 96-h LC 50 of atrazine for trout embryos and larvae ranged from 0.87 to 1.11mg L -1…”

Section: Discussionmentioning

confidence: 99%

Acute toxicity test of agricultural pesticides on silver catfish (Rhamdia quelen) fingerlings

et al. 2008

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Toxicity risks of agricultural pesticides to fishes are pivotal. Currently, many questions remain unsolved regarding to the toxicity of commonly used pesticides to silver catfish (Rhamdia quelen), a South American catfish. The present studies have been designed to investigate the acute toxicity and the lethal concentration (LC50) of four herbicides, two fungicides and two insecticides to silver catfish fingerlings. All experiments were carried out in triplicates, in a static bioassay system, using commercially available pesticides. The data was analyzed through the Trimmed Spearman-Karber method available from the Environmental Protection Agency. The 96hLC50 and 95% lower and upper confidence limits, respectively, for the following pesticides were determined: glyphosate (7.3mg L-1; 6.5-8.3), atrazine (10.2mg L-1; 9.1-11.5), atrazine+simazine (10.5mg L-1; 8.9-12.4), mesotrione (532.0mg L-1; 476.5-594), tebuconazole (5.3mg L-1; 4.9-5.7), methylparathion (4.8mg L-1; 4.3-5.3), strobulurin and triazol (9.9mg L-1; 8.7-11.2). Diflubenzuron was also tested and caused no fish mortality up to 1g L-1. The toxic concentration of these pesticides to silver catfish fingerlings fell above the concentration used for application in the field and, except following accidental application or misplacing of empty recipients, it should not cause fish mortality. Nonetheless, the data obtained will be useful to study the long-term effect of these products on the hematological, biochemical, hormonal and immunological parameters of silver catfish and related fish species in South Brazil.

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“…In addition to effects on the gill, impairment of the kidney function may also play a role in the observed loss of plasma ions. Fisher-Scherl et al (1991) and Oulmi et al (1995) showed that ATZ concentrations between 10 and 80 g l −1 can cause degeneration in the proximal tubules of the kidneys of rainbow trout, which may increase the renal excretion of ions and proteins. Elevated plasma Na + and Cl − following SW challenge indicate that exposure to 100 g l −1 ATZ decreases salinity tol- Table 4 Three months specific growth rate (SGR) in seawater smolts previously treated for 21 days with 10 and 100 g l −1 ATZ, and 100 g l −1 HEX…”

Section: Treatmentsmentioning

confidence: 99%

Effects of hexazinone and atrazine on the physiology and endocrinology of smolt development in Atlantic salmon

2007

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Exposure to hexazinone (HEX) and atrazine (ATZ), highly mobile and widely used herbicides along rivers in the United States, is potentially harmful to Atlantic salmon, which have been listed as an endangered species. To determine the effects of these contaminants on smolt development, juvenile Atlantic salmon were exposed under flow-through conditions to 100 g l −1 HEX, 10 and 100 g l −1 ATZ in fresh water (FW) for 21 days at 10 • C beginning in mid-April. Twelve fish per treatment were sampled in FW, following a 24 h seawater (SW) challenge and after growth for 3 months in SW. Exposure to 100 g l −1 HEX or 10 g l −1 ATZ caused no mortalities of smolts in FW or after SW challenge, while 9% of the fish exposed to 100 g l −1 ATZ died during exposure. Fish exposed to 100 g l −1 ATZ reduced feeding after 10 days of exposure and had an impaired growth rate in FW and during the first month in SW; compensatory growth occurred in the second and third month in SW. HEX and ATZ at 10 g l −1 exposure had no effect on plasma levels of cortisol, growth hormone (GH), insulin growth factor I (IGF-I), thyroxine (T 4 ) and plasma 3,5,3 -triiodo-l-thyronine (T 3 ), Cl − , Mg 2+ , Na + , Ca 2+ in FW or after SW challenge. FW smolts exposed to 100 g l −1 ATZ had decreased plasma Cl − , Mg 2+ , Na + and Ca 2+ ions and increased cortisol. No effect on plasma levels of GH, IGF-I, T 4 or T 3 was found in FW smolts exposed to 100 g l −1 ATZ. Following SW challenge, fish previously exposed to 100 g l −1 ATZ had significant increases in hematocrit, plasma cortisol, Cl − , Mg 2+ , Na + , Ca 2+ and a decrease in T 4 and T 3 . It is concluded that under the conditions imposed in this study, HEX does not affect salinity tolerance of Atlantic salmon smolts, while ATZ causes ionoregulatory, growth and endocrine disturbance.

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Segment Specificity of the Cytological Response in Rainbow Trout (Oncorhynchus mykiss) Renal Tubules Following Prolonged Exposure to Sublethal Concentrations of Atrazine

Cited by 37 publications

References 0 publications

Toxicidade aguda de herbicidas a tilápia (Oreochromis niloticus)

Toxicidade aguda de herbicidas a tilápia (Oreochromis niloticus)

Acute toxicity test of agricultural pesticides on silver catfish (Rhamdia quelen) fingerlings

Effects of hexazinone and atrazine on the physiology and endocrinology of smolt development in Atlantic salmon

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