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Morphological and cardiac alterations after crude oil exposure in the early-life stages of the tropical gar (Atractosteus tropicus)

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Abstract

Fish development can be affected by environmental pollutants such as crude oil (anthropogenic or natural sources), causing alterations especially in cardiac function and morphology. Most such studies have focused on saltwater species, whereas studies in freshwater fishes are scant. The objective of the current study was to evaluate the effects of crude oil exposure (as 0, 5, 10, 15, or 20% high-energy water accommodated fractions, HEWAF) on cardiac function and edema formation during two early periods of development (embryo and eleuteroembryo, 48 h each) individually using the tropical gar Atractosteus tropicus as a model. Embryos did not exhibit alterations in body mass, total length, condition factor, and cardiac function as a function of oil. In contrast, eleuteroembryos proved to be more sensitive and exhibited increased body mass, total length, and condition factor, decreased heart rate and phenotypic alterations such as cardiac dysmorphia (tubular hearts) and spine curvature at high concentrations of HEWAF. Moreover, edema formation was observed in both stages This study shows different functional responses of A. tropicus after crude oil exposure and provides useful information of the developmental impacts of these compounds on the early life stages of freshwater tropical fishes.

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Acknowledgements

We thank the National Council of Science and Technology in Mexico for the scholarship for Simrith Elizabeth Córdova de la Cruz and the Remediation Laboratory if the Universidad Juárez Autónoma de Tabasco for providing the crude oil samples for this study.

Funding

Gabriel Núñez-Nogueira received support from the Programa Institucional para la Incorporación al Sistema Nacional de Investigadores UJAT Program.

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Contributions

SECC performed the experiments for her master thesis, analyzed data, interpreted results of experiments, prepared figures and tables, and drafted this manuscript. CAAG and WWB were the advisers of the master thesis, contributed to the conception and design of this research, and edited and approved the final manuscript. GMB, GNN, ESPM, RMG, and RHA contributed with the material preparation, data collection, and data analysis, edited previous versions of the manuscript, and approved the final manuscript.

Corresponding author

Correspondence to Carlos Alfonso Alvarez-González.

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Ethics approval and consent to participate

Animals were handled in compliance with the Norma Oficial Mexicana NOM-062-ZOO-1999 from Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación, the Mexican standards for good welfare practices of laboratory animals.

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Not applicable.

Competing interests

The authors declare no competing interests.

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Responsible Editor: Bruno Nunes

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Córdova-de la Cruz, S.E., Martínez-Bautista, G., Peña-Marín, E.S. et al. Morphological and cardiac alterations after crude oil exposure in the early-life stages of the tropical gar (Atractosteus tropicus). Environ Sci Pollut Res 29, 22281–22292 (2022). https://doi.org/10.1007/s11356-021-17208-9

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  • DOI: https://doi.org/10.1007/s11356-021-17208-9

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