The Morphometric and Meristic Features of the Oreochromis Niloticus and Hepsetus Odoe Fish Species in Owanla Reservoir, Ore, Osun State, Nigeria

Morphometric and meristic analyses are crucial tools for distinguishing fish populations and assessing ecological adaptations within aquatic environments. This study investigated the morphometric and meristic characteristics of Oreochromis niloticus and Hepsetus odoe inhabiting the Owalla Reservoir, Osun State, Nigeria, to determine their population structure, growth patterns, and environmental responses. Ninety-eight specimens (53 O. niloticus and 45 H. odoe) were collected between July and October 2024 using gill and cast nets. Standard morphometric measurements and meristic counts were obtained and analyzed using SPSS version 22.0. Length–weight relationships (LWR) were established through regression models, while the physicochemical properties of the reservoir water were assessed to evaluate environmental suitability. Results revealed positive allometric growth in both species (b > 3), indicating improved weight gain relative to body length, with O. niloticus showing a stronger correlation (r² = 0.96) than H. odoe (r² = 0.91). The water’s physicochemical parameters, including dissolved oxygen (5.10–7.32 mg/L), temperature (24–27.6 °C), and pH (6.57–7.10), were within optimal limits for tropical fish sustainability. Statistical visualizations showed distinct linear growth trends between total length and body weight across species and age groups. The findings underscore the ecological adaptability of both species and their potential for aquaculture development.

Morphometric analysis, Oreochromis niloticus, Hepsetus odoe, Owalla Reservoir

1. Adesina, B. T., Aluko, P. O and Ogunbajo, A. A. (2021). Morphometric and meristic variation of selected freshwater fishes in Nigerian inland waters. African Journal of Aquatic Science, 46(3), 245–255. https://doi.org/10.2989/16085914.2021.1902783 [Google Scholar] [Crossref]

2. Agboola, J. I., Fagbuaro, O and Olatunji, O. M. (2024). Comparative ecology and trophic adaptation of Hepsetus odoe and Clarias gariepinus in tropical freshwater ecosystems. Fisheries and Aquatic Sciences, 27(1), 33–45. https://doi.org/10.1186/s41240-024-00352-5 [Google Scholar] [Crossref]

3. Akinwande, A. A., Oso, J. A and Fawole, O. O. (2022). Seasonal variability in morphometric traits and condition factor of cichlid species from Nigerian reservoirs. Environmental Monitoring and Assessment, 194(5), 233. https://doi.org/10.1007/s10661-022-09970-1 [Google Scholar] [Crossref]

4. American Public Health Association (APHA). (2020). Standard methods for the examination of water and wastewater (23rd ed.). APHA Press. [Google Scholar] [Crossref]

5. Bagenal, T. B and Braum, E. (1978). Eggs and early life history. In T. B. Bagenal (Ed.), Methods for assessment of fish production in fresh waters (pp. 165–201). Blackwell Scientific. [Google Scholar] [Crossref]

6. Bing, X., Liang, S and Xu, Q. (2022). Morphometric and meristic characterization of tilapia (Oreochromis spp.) populations under different environmental conditions. Aquaculture Reports, 23, 101062. https://doi.org/10.1016/j.aqre.101062 [Google Scholar] [Crossref]

7. Eyo, A. A. (2001). Fish processing technology in the tropics. University of Ilorin Press. [Google Scholar] [Crossref]

8. Fagbuaro, O., Olatunji, O. M and Agboola, J. I. (2021). Relationship between length–weight parameters and condition factor of Tilapia zillii in Erelu Reservoir, Oyo State, Nigeria. Egyptian Journal of Aquatic Biology and Fisheries, 25(3),123-136.https://doi.org/10.21608/ejabf.171249. [Google Scholar] [Crossref]

9. Food and Agriculture Organization (FAO). (2021). The state of world fisheries and aquaculture: Blue transformation. FAO. [Google Scholar] [Crossref]

10. Food and Agriculture Organization (FAO). (2022). Ecosystem-based fisheries management: Practical implementation guidelines. FAO Fisheries Technical Paper No. 678. [Google Scholar] [Crossref]

11. González, J. A., Pérez, N. A and Martínez, C. (2016). Morphometric and meristic differentiation of cichlid species from West African rivers. Journal of Fish Biology, 89(4), 2123–2136. https://doi.org/10.1111/jfb.13082 [Google Scholar] [Crossref]

12. Hussain, A., Rahman, M. S and Hossain, M. Y. (2023). Morphometric relationships and population structure of Oreochromis niloticus in tropical reservoirs. Regional Studies in Marine Science, 63, 102024. https://doi.org/10.1016/j.rsma.102024 [Google Scholar] [Crossref]

13. Hussen, A., Tessema, M and Abebe, G. (2021). Length–weight relationships and condition factors of Oreochromis niloticus in Lake Tana, Ethiopia. International Journal of Fisheries and Aquatic Studies, 9(2), 11–18. https://doi.org/10.22271/fish.v9.i2a.2429 [Google Scholar] [Crossref]

14. Kefi, F. J., Ssekyewa, C and Amankwah, M. (2023). Morphometric variability and growth patterns in Nile tilapia across East African aquaculture systems. Aquaculture Research, 54(2), 523–534. https://doi.org/10.1002/aqr.5876 [Google Scholar] [Crossref]

15. Nugraha, R., Prihadi, T. H and Rosana, M. (2020). Analysis of morphometric and meristic characteristics of tilapia species cultivated in Indonesian reservoirs. Biodiversitas, 21(12), 5833–5841. https://doi.org/10.13057/biodiv/d211228 [Google Scholar] [Crossref]

16. Obiekezie, I. I., Adebayo, O. T and Nnaji, J. C. (2022). Comparative morphometric analysis of Oreochromis niloticus populations from different Nigerian water bodies. African Zoology, 57(2), 157–169. https://doi.org/10.1080/15627020.2046825 [Google Scholar] [Crossref]

17. Ogunbajo, A. A., Fawole, O. O and Akinwande, A. A. (2021). Morphometric differentiation and environmental adaptation of Oreochromis niloticus from two tropical freshwater lakes. Fisheries Research, 238, 106208. https://doi.org/10.1016/j.fishres.106208 [Google Scholar] [Crossref]

18. Olaosebikan, B. D and Raji, A. (2020). Field guide to Nigerian freshwater fishes (Rev. ed.). Federal College of Freshwater Fisheries Technology Press. [Google Scholar] [Crossref]

19. Olatunji, O. M., Agboola, J. I and Fagbuaro, O. (2023). Length–weight dynamics and ecological indices of tilapia species in relation to environmental parameters. African Journal of Aquatic Science, 48(1), 77–88. https://doi.org/10.2989/16085914.1234567. [Google Scholar] [Crossref]

20. Randall, J. E. and Pyle, R. L. (2008). Synodus orientalis, a new lizardfish (Aulopiformes: Synodontidae) from Taiwan and Japan, with correction of the Asian record of S. lobeli. Zool. Stud. 47: 657-662. 9. [Google Scholar] [Crossref]

21. Safi, A (2014). Study of some morphometric and meristic characters of striped piggy fish, Pomadasys stridens (Forsskal, 1775) from Karachi Coast, Pakistan. Journal of Zoology Studies. 1(4):1-6. [Google Scholar] [Crossref]

22. Sreekanth, G. B., Radhakrishnan, E. V and Joseph, I. (2021). Morphometric analysis and growth assessment of selected freshwater fishes using traditional and truss network methods. Journal of Applied Ichthyology, 37(6), 981–992. https://doi.org/10.1111/jai.14283. [Google Scholar] [Crossref]

23. Turan, C.; Erguden, D. and Gurlek, M. (2004). Morphometric structuring of the Anchovy (Engraulis encrasicolus) in the black, Aegean and northeastern mediterranean seas. Turkish Journal of Vetinary of Animal Science 28: 865-871. [Google Scholar] [Crossref]

24. World Health Organization (WHO). (2022). Guidelines for drinking-water quality (5th ed.). WHO Press. [Google Scholar] [Crossref]

25. Zar, J. H. (2010). Biostatistical analysis (5th ed.). Pearson Education. [Google Scholar] [Crossref]

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