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International Journal of Zoology and Applied Biosciences Research Article

Directional asymmetry of otoliths of Chrysichthys nigrodigitatus (lacépède 1803) indicator of environmental stress in the comoé river basin (Ivory coast)

ZPO Yébé, MK Konan, WY Koné and N. Konaté

Year : 2025 | Volume: 10 | Issue: 5 | Pages: 58-66

doi: https://doi.org/10.55126/ijzab.2025.v10.i05.008

Received on: 29/07/2025

Revised on: 06/08/2025

Accepted on: 30/08/2025

Published on: 30/09/2025

  • ZPO Yébé, MK Konan, WY Koné and N. Konaté ( 2025).

    Directional asymmetry of otoliths of Chrysichthys nigrodigitatus (lacépède 1803) indicator of environmental stress in the comoé river basin (Ivory coast)

    . International Journal of Zoology and Applied Biosciences, 10( 5), 58-66.

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Abstract

The impact of pollution on the otoliths of Chrysichthys nigrodigitatus organisms from the middle course of the Comoé River was assessed through the study of asymmetry. Quarterly sampling of 201 specimens of Chrysichthys nigrodigitatus was carried out over one year, from February 2021 to March 2022 at five sampling stations (M’Basso, Manzan, YèrèYèrè, Abradinou and Bettié). The otoliths were extracted and then measured. The Shapiro-Wilk test was performed to statistically verify the normality of the variables (weight, area, width, length and perimeter). Asymmetry was assessed through the AF1 and AF2 indices. After this assessment, we used analysis of variance (ANOVA) and the Tukey-Kramer post-hoc test to test for differences in directional asymmetry between sites. Directional asymmetry values were found to vary significantly between sampling sites. Otolith analysis revealed marked directional asymmetry, predominantly oriented toward the right side. The Manzan, Bettié, Abradinou, and YèrèYèrè stations displayed the highest mean directional asymmetry, while M&

Keywords

Chrysichthys nigrodigitatus, Echantillonnage, Erreur de mesure, Points aberrants, Pollution.

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    © The Author(s) 2025. This article is published by International Journal of Zoology and Applied Biosciences under the terms of the Creative Commons Attribution 4.0 International License (creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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