Abstract:A libertação de poluentes tradicionais e emergentes nos ecossistemas aquáticos tem levado à contaminação da água e sedimentos, o que pode afetar a saúde dos animais selvagens, das suas populações e contaminar as cadeias alimentares com consequências na ecologia, mas também na saúde pública. Estes diversos compostos tóxicos (incluindo os lipossolúveis e persistentes) podem chegar aos ecossistemas através de diferentes vias e os seus efeitos da exposição aguda e/ou crónica nos organismos não-alvo ainda não são b… Show more
“…In the case of Danio rerio, also known as zebrafish, knowledge of the morphological, physiological, biochemical, and genetic parameters in all its stages of development, as well as in both sexes, makes this fish an ideal model system to be used in toxicology research to identify the adverse effects of xenobiotics (CANEDO and ROCHA, 2021). In addition, zebrafish are small (about 4-5 cm), have rapid development, high fecundity, high adaptability to the laboratory environment, and easy maintenance (RIBEIRO et al, 2022). Rapid development is an excellent feature in genotoxicity studies, as it allows monitoring of all toxic effects in a short period and even transgenerational implications (DAI et al, 2014).…”
Section: Bioassays With Fishmentioning
confidence: 99%
“…However, zebrafish have no genetically discernible sex and only exhibit sexual dimorphism three weeks after fertilization. Despite the limitations, interest in this species has grown immensely in recent decades, which is easily verified by the number of published scientific articles, and the species is currently a reference in toxicology (RIBEIRO et al, 2022).…”
Environmental changes directly influence quality of life, and environmental protection laws arise to ensure the maintenance of ecological balance. Aquatic environments have been contaminated by substances of anthropic origin, which are called effluents. Improper disposal of effluents has adverse effects on the environment and human health. In Brazilian legislation, the resolutions of the National Council for the Environment (CONAMA) RE 357/2005 and RE 430/2011 address the use of indicator species to evaluate the effluents’ toxicity. Despite these, much still needs to be done to control and monitor the emission of effluents in Brazilian water resources. The objective of this work was to carry out a historical survey of the regulations on the disposal of effluents in Brazil and to show the differences in each state's regulations, highlighting the indicator species accepted in each regulation and their advantages and disadvantages. In this way, this review summarizes and organizes the information of the Brazilian legislation on the disposal of effluents and helps the researcher in the area to choose between the methodologies adopted for the analysis of their environmental samples. Despite the insertion of bioassays, it is evident that the current Brazilian legislation is permissive, requiring adaptations and definitions to increase adherence to the ecotoxicological monitoring of water resources by the States.
“…In the case of Danio rerio, also known as zebrafish, knowledge of the morphological, physiological, biochemical, and genetic parameters in all its stages of development, as well as in both sexes, makes this fish an ideal model system to be used in toxicology research to identify the adverse effects of xenobiotics (CANEDO and ROCHA, 2021). In addition, zebrafish are small (about 4-5 cm), have rapid development, high fecundity, high adaptability to the laboratory environment, and easy maintenance (RIBEIRO et al, 2022). Rapid development is an excellent feature in genotoxicity studies, as it allows monitoring of all toxic effects in a short period and even transgenerational implications (DAI et al, 2014).…”
Section: Bioassays With Fishmentioning
confidence: 99%
“…However, zebrafish have no genetically discernible sex and only exhibit sexual dimorphism three weeks after fertilization. Despite the limitations, interest in this species has grown immensely in recent decades, which is easily verified by the number of published scientific articles, and the species is currently a reference in toxicology (RIBEIRO et al, 2022).…”
Environmental changes directly influence quality of life, and environmental protection laws arise to ensure the maintenance of ecological balance. Aquatic environments have been contaminated by substances of anthropic origin, which are called effluents. Improper disposal of effluents has adverse effects on the environment and human health. In Brazilian legislation, the resolutions of the National Council for the Environment (CONAMA) RE 357/2005 and RE 430/2011 address the use of indicator species to evaluate the effluents’ toxicity. Despite these, much still needs to be done to control and monitor the emission of effluents in Brazilian water resources. The objective of this work was to carry out a historical survey of the regulations on the disposal of effluents in Brazil and to show the differences in each state's regulations, highlighting the indicator species accepted in each regulation and their advantages and disadvantages. In this way, this review summarizes and organizes the information of the Brazilian legislation on the disposal of effluents and helps the researcher in the area to choose between the methodologies adopted for the analysis of their environmental samples. Despite the insertion of bioassays, it is evident that the current Brazilian legislation is permissive, requiring adaptations and definitions to increase adherence to the ecotoxicological monitoring of water resources by the States.
“…Early life impacts, especially during embryonic development, can shape the future performance of organisms at the molecular and population levels. Early exposure to contaminants may have extensive consequences, impacting the overall health, molecular processes, and population dynamics of fish species beyond immediate effects [ 16 ].…”
Section: Introductionmentioning
confidence: 99%
“…Fish serve as suitable organisms for research because they play vital roles in the aquatic food chain and are efficacious bioindicators. Their heightened sensitivity to aquatic pollutants further underscores their importance in ecotoxicological studies [ 16 ]. Zebrafish ( Danio rerio ), freshwater teleost cyprinid fish, have emerged as a pivotal predictive and high-throughput model in toxicological research [ 17 ].…”
Triclopyr, an auxin-like herbicide that is widely employed for managing weeds in food crops and pastures, has been identified in various environmental settings, particularly aquatic ecosystems. Limited understanding of the environmental fate of this herbicide, its potential repercussions for both the environment and human health, and its insufficient monitoring in diverse environmental compartments has caused it to be recognized as an emerging contaminant of concern. In this study, we have investigated how triclopyr affects zebrafish, considering a new alternative methodology. We focused on the endpoints of developmental toxicity, neurotoxicity, and behavior of zebrafish embryos and larvae. We determined that triclopyr has a 96 h median lethal concentration of 87.46 mg/L (341.01 µM). When we exposed zebrafish embryos to sublethal triclopyr concentrations (0.5, 1, 5, 10, and 50 μM) for up to 144 h, we found that 50 µM triclopyr delayed zebrafish egg hatchability. Yolk sac malabsorption was significant at 0.5, 1, 5, and 10 µM triclopyr. In zebrafish larvae, uninflated swim bladder was significant only at 50 µM triclopyr. Furthermore, zebrafish larvae had altered swimming activity after exposure to 10 µM triclopyr for 144 h. In summary, these comprehensive results indicate that even low triclopyr concentrations can elicit adverse effects during early zebrafish development.
“…Fish are suitable organisms for research due to their essential roles in the aquatic food chain and their effectiveness as bioindicators. Their high sensitivity to aquatic pollutants further supports their utility in ecotoxicological studies [16]. Zebrafish (Danio rerio), a freshwater teleost cyprinid fish, has emerged as a key predictive and high-throughput model in toxicological research [17].…”
Triclopyr is an auxin-like herbicide extensively employed to manage weeds in food crops and pastures. Triclopyr has been detected in environmental matrices, with a notable presence within aquatic ecosystems. Given the limited understanding of its fate in the environment, potential implications for environmental and human health, and the lack of adequate monitoring in various environmental compartments, triclopyr is now considered a contaminant of emerging concern (CEC). The present study was undertaken to investigate the impact of triclopyr on zebrafish development, with a specific focus on assessing its embryotoxic, behavioral, and neurotoxic effects at environmentally realistic concentrations ranging from 0.5 to 50 µM on zebrafish embryos. Our results revealed that triclopyr caused sublethal effects on zebrafish embryos, such as delayed hatchability at 50 µM, yolk sac retention at 0.5, 1, 5, and 10 µM, and uninflated swim bladder at 50 µM concentration of triclopyr. Moreover, a subtle alteration in the swimming activity of larvae was observed in the 10 µM triclopyr after 144 hours of exposure. However, the activity of acetylcholinesterase, remained unchanged after triclopyr exposure. Taken together, these comprehensive findings suggest that triclopyr can induce adverse effects on the early development of zebrafish, even at concentrations detected in aquatic environments.
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