Uso de peixes como biomarcadores para monitoramento ambiental aquático

Lins, J. A. P. N.; Kirschnik, Peter Gaberz; Queiroz, Valter da Silva; Círio, Silvana Maris

doi:10.7213/cienciaanimal.v8i4.11018

Cited by 22 publications

(9 citation statements)

References 68 publications

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“…Alterações histopatológicas podem resultar da exposição de xenobióticos e são respostas pouco específicas ao agente estressor que refletem a mudanças da morfologia dos tecidos a estímulos adversos (Wolf et al, 2015). As brânquias são bons indicadores de toxicidade pois é uma das principais vias de entrada de contaminantes em peixes, enquanto o rim e o fígado são excelentes indicadores que podem evidenciar efeitos metabólicos e de ação tóxica (Lins et al, 2010). Moraes et al (2018) observaram alterações branquiais em Brycon amazonicus após exposição a 7,2 µg L -1 a cipermetrina, enquanto Benli & Özkul (2010), encontraram deformidades nas lamelas, hiperemia, proliferação de células do epitélio e cloreto, fusão de lamelas secundárias e telangiectasias em O. niloticus expostos a 0,5 mg L -1 a fenitrotion por 96h.…”

Section: Discussionunclassified

Avaliação de toxicidade de biopesticida comercial à base de Bacillus thuringiensis em tilapia-do-Nilo, Oreochromis niloticus

Simão

Silva

Soares

et al. 2021

RSD

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Os biopesticidas são usados como uma alternativa ao uso de pesticidas químicos sintéticos. As formulações que contêm esporos de Bacillus thuringiensis (Bt) são amplamente utilizados, entretanto, pouco se sabe dos efeitos na biota aquática. O objetivo do estudo foi avaliar os efeitos genotóxicos e histopatológicos de uma concentração subletal de um biopesticida comercial à base de Bt em Oreochromis niloticus. Os peixes foram divididos (n = 10) em um grupo controle (GC) e um grupo exposto (GBt) na concentração de 60 mg L-1 do biopesticida Dipel® WP por 48 horas. Após a exposição, amostras de sangue, brânquias, fígado e rim foram coletadas para análise de biomarcadores de toxicidade. Os resultados demonstram que uma exposição aguda ao Bt induz o aumento de núcleos eritrocitários com morfologia segmentada. Não foi observado a indução de micronúcleos. As análises histopatológicas demonstraram que em 48 horas de exposição, no GBt, houve uma diminuição na frequência de hepatócitos hipertrofiados. Entretanto, o biopesticida não comprometeu a morfologia dos tecidos em toxicidade aguda. Os pesticidas de modo geral, são aplicados constantemente e regulamentações de uso não são amplamente seguidas, assim, nossos resultados sugerem que concentrações subletais podem induzir efeitos quando expostos de modo agudo. Os biopesticidas à base de Bt em baixas concentrações parecem ser pouco tóxicos aos peixes.

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Section: Discussionunclassified

Avaliação de toxicidade de biopesticida comercial à base de Bacillus thuringiensis em tilapia-do-Nilo, Oreochromis niloticus

Simão

Silva

Soares

et al. 2021

RSD

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“…The analysis of the tissue of organs that come into direct contact with toxic agents, such as the gills, or those that metabolize (liver) or excrete (kidneys) xenobiotic compounds can provide clear evidence of toxic effects (Lins, Kirschnik, Queiroz, & Cirio, 2010). These histopathological indicators provide an important tool for the assessment of the health of fish (Schwaiger et al, 1997;Rašković et al, 2013;Samanta et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Evidence of cytogenetic and histological damage in specimens of Astyanax lacustris (Pisces, Characidae) exposed to the hydrogen cyanide-based herbicide Dormex®

Zafra-Lemos

Lopes

Rampazzo

et al. 2021

Acta Sci. Biol. Sci.

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The herbicide Dormex®, a solution of hydrogen cyanamide, is a growth regulator capable of breaking the dormancy of fruit plants, and is commonly applied in agriculture. However, the biological effects of this product on non-target organisms are unknown. The present study investigated the biological response of Astyanax lacustris (Lütken, 1875) specimens exposed to Dormex® using a chromosome aberration test, the mitotic index, and the histological analysis of the gills. Forty specimens of Astyanax lacustris were obtained from a local breeding facility and divided into 10 groups (nine experimental and one control) with four fish in each aquarium (group). The control group was maintained for 24 hours in dechlorinated water while the experimental groups were allocated to one of nine different treatments, with three concentrations of Dormex®, 0.05, 0.1 and 0.5 mL L-1, and exposure for 24, 48 and 72 hours. The fish exposed to Dormex® presented chromosomal aberrations of a number of types, including chromosomal breaks, acentric fragments, decondensation, and gaps at the three Dormex® concentrations, at all exposure times. The mitotic index decreased significantly in comparison with the control group. The histological preparations of the gills revealed alterations such as hyperplasia, and lamellar fusion and edema, whereas in the control group the structure of the gills was preserved. The cytogenetic analysis revealed the genotoxic potential of the herbicide Dormex® and the morphological alterations of the gills demonstrated the sensitivity of the fish, which responded rapidly to the stressor. These findings reinforce the need for special care and restrictions on the use of these herbicides in agricultural areas located near aquatic environments.

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“…8, n. 19, p. 1155-1168. immediate death of aquatic organisms exposed to contaminants. However, sublethal concentrations can affect several morphological, physiological, and metabolic processes of fish when those contaminants penetrate their organs (Lins et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Reproductive aspects of freshwater fishes exposed to pesticide-contamined environments: A systematic review

Santos¹,

Almeida²,

Costa³

et al. 2021

Rev. Bras. Gest. Amb. Sustent.

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Fish are the predominant group of vertebrates in aquatic environments, and they are directly affected by the presence of contaminants in water bodies, which undergo changes in the structure and function of communities and dynamics of the populations. The aim of the present study was to conduct a systematic review of studies that analyze the reproductive aspects of freshwater teleosts in environments contaminated by pesticides. A systematic search for scientific articles was carried out from 2000 to 2019 using the "Web of Science" database, using the descriptors "fish reproduction", "contamination", "toxicology", "ecotoxicity" and "biomonitoring", combined with the use of boolean operators "AND" and "OR". The content analysis was performed based on the titles and the summary, with a first screening. Then, 98 articles were read in full, with 40 being selected. 24 species of fish were recorded, with a predominance of Danio rerio (17.5%). Insecticides were present in 78% of the studies, mainly Endosulfan (35%) and Cypermethrin (13%). Reproductive endocrine disorders were the most reported pathways of action (57.5%). The effects of pesticides on the reproduction of freshwater teleosts are evident, requiring studies on structural changes in gonads and a decrease in the quality of gametes.

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Uso de peixes como biomarcadores para monitoramento ambiental aquático

Cited by 22 publications

References 68 publications

Avaliação de toxicidade de biopesticida comercial à base de Bacillus thuringiensis em tilapia-do-Nilo, Oreochromis niloticus

Avaliação de toxicidade de biopesticida comercial à base de Bacillus thuringiensis em tilapia-do-Nilo, Oreochromis niloticus

Evidence of cytogenetic and histological damage in specimens of Astyanax lacustris (Pisces, Characidae) exposed to the hydrogen cyanide-based herbicide Dormex®

Reproductive aspects of freshwater fishes exposed to pesticide-contamined environments: A systematic review

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