Physicochemical Characteristics, Fish Species Composition and Diversity of Orakpa River, Kogi State, Nigeria
Abstract
This study assessed the physicochemical characteristics, fish species composition, and diversity of Orakpa River, a tributary of the Lower River Niger in Kogi State, Nigeria. Water and fish samples were collected from three sampling stations (upstream, midstream, and downstream) over a three-month period (July-September 2022). Physicochemical parameters were analyzed using standard methods, while fish species were identified using taxonomic keys. Fish diversity was evaluated using Simpson’s Index. Results showed that most physicochemical parameters, including pH (7.60-7.67), temperature (26.67-27.00°C), dissolved oxygen (5.03-6.30mg/L) and conductivity (95.25-140.72µS/cm), were within acceptable limits for tropical freshwater fish species. However, dissolved oxygen decreased downstream (5.03 mg/L), indicating localized environmental stress. A total of 646 fish individuals comprising 20 species from 10 families were recorded. The family Bagridae, particularly Bagrus bayad (23.2%), was the most dominant, while Schilbe mystus (0.7%) was the least abundant species. Fish abundance was highest at the midstream station and lowest downstream, reflecting variations in environmental conditions. The Simpson’s Index of Diversity (1 - D = 0.90) indicated high species diversity, suggesting a relatively stable ecosystem despite moderate dominance by a few species. The study concludes that Orakpa River maintains good ecological status but shows signs of downstream environmental stress. These findings provide essential baseline data for sustainable management, conservation planning, and future monitoring of the river system.
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Adaka, G. (2021). Assessment of Abundance, Diversity and Distribution of Freshwater Fishes of Tropical Rainforest Rivers, Southeast Nigeria. New Visions in Biological Science 1(7), 156–165.
Adarsh, K., , S., Suryawanshi, U., Amogha, K., Kumar, S., Shivani, D., & Pathan, J. (2024). Fish Species Distribution and Diversity Indices of Hemavathi Reservoir, Hassan, Karnataka. Uttar Pradesh Journal Of Zoology. (19),130-41.
Adeloye, A.J. (2014). Rivers and human development.Edinburg, UK: Eolss publishers. 45-50
Alebachew, S., Tesfahun, A., & Kebtieneh, N. (2022). Abundance, distribution, and diversity of fishes in Ribb Reservoir, Lake Tana basin, Ethiopia. Cogent Food & Agriculture, 8.
Al-Hajaj, W., & Turab, M. (2025). Spatial and temporal variations of Some Chemical characteristics for water quality of Shatt Al-Arab River/ Basrah-South of Iraq. Basrah Researches Sciences. 51(2), 10.
Bhagde, R., Pingle, S., Bhoye, M., Pansambal, S., & Deshmukh, D. (2020). A comparative study of physico-chemical parameters of the freshwater ponds from sangamner taluka of ahmednagar, Maharashtra, India. International Journal of Biological Innovations. 2(2), 137-142.
Boris, J., Djuradj, M., Milica, S. and Piperac, A. (2016). In situ effects of titanium dioxide nano particles on community structure of freshwater benthic macroinvertebrates. Environmental Pollution, 213: 278-282.
Bytyci, P.,Zhushi, F., Bujar H., Hazir S. (2018). Status Assessment of Heavy metals in water of the lepenci River basin,Kosova. Journal of Ecological Engineering, 19 (5), 19-32.
Costa, D., & Cutrim, M. (2021). Spatial and seasonal variation in physicochemical characteristics and phytoplankton in an estuary of a tropical delta system. Regional Studies in Marine Science, 44, 101746.
Das, S., Khan, A., Alam, A., Dubey, V., & Joshi, K. (2020). Piscine diversity, Community structure and Distribution patterns of the West Ramganga River: A mid-Himalayan tributary of River Ganga. The Indian Journal of Animal Sciences. 90(1), 109-115.
Das, S., Srinivasan, N., Sarang, N., Das, S., Jawahar, A., Canciyal, J., & Panda, K. (2023). Effect of environmental drivers of fish assemblage and diversity patterns in temporal scale in Mongra Reservoir: A case study from one of the tributaries of Mahanadi Basin, Central India. Ecohydrology, 16(8), e2599.
David, D., Godwin, C., Garkida, D., & Emmanuel, A. (2025). Assessment of Fish Species Composition and Abundance at Selected Landing Sites Along the Upper Benue River Basin in Taraba State, Nigeria. Journal of Multidisciplinary Science: MIKAILALSYS. 3(1), 225-249.
Davie, T. (2018). Fundamentals of hydrology: Taylor & Francis.
Fisseha, T., Asfaw, A., & Zeleke, A. (2025). Current Status of Fish Species Diversity and Relative Abundance of Beko and Gacheb Rivers, Southwest Ethiopia: Implication for Fishery Opportunity. Ecology and Evolutionary Biology. 10(1), 22-33.
Fotsing, J., Menbohan, S., Meyer, A., Leprêtre, A., & Usseglio-Polatera, P. (2022). Relationships between Physico-Chemical Parameters and Taxonomic Structure of Benthic Macroinvertebrate Assemblages in Streams of West Cameroon. Water. 14(9), 1490.
Ikpi, G., Okey, I., & Offem, B. (2022). Re-evaluation Survey of Fish Composition, Abundance and Distribution in Agbokim Waterfalls, Nigeria. Asian Journal of Fisheries and Aquatic Research. 18(2), 6-20.
Imorou, R., Adite, A., Sossoukpè, E., & Abou, Y. (2019). Length-weight models and condition factors of fishes from Okpara Stream, Oueme River, Northern-Benin. International Journal of Forest, Animal and Fisheries Research. 3(3), 65-80.
Isemin, N., Ukpatu, J., & Udoidiong, O. (2023). Spatial Rhythm and Periodic Pattern of Fish Species in Eniong River, South Eastern Nigeria. Journal of Applied Life Sciences International. 26(3), 1-15.
Jamu, D.M. and A.O. Ayinla, (2013): Potential for the Development of Agriculture in Africa. NAGA, 26(3): 9-13.
Johnson, C., Sarkar, U., Koushlesh, S., Das, A., Das, B., & Naskar, B. (2021). Fish assemblage, ecosystem status and potential impact of Nile Tilapia in Halali Reservoir of Central India. Environment, Development and Sustainability, 24, 7753 - 7775.
Joshi, P., & Joshi, Y. (2025). Physicochemical Parameters of Water and Their Effects in Temporal Variation of Fish Composition in Lower Reaches of Mahakali River, Nepal. Annals of Agri-bio Research. 30 (1), 1-9.
Kadye, W.T., Moyo, N.A.G., Magadza, C.H.D. and Kativu, S. (2018). Stream fish assemblages in relation to environmental factors on a Montane Plateau (Nyika Plateau, Malawi). Environmental Biology of Fishes, 83, 417-428.
Lafuente, W., Carpio, A., Alcácer, C., & Moreno, J. (2023). Spatio-temporal variability of physicochemical conditions in the headwaters of neotropical streams. Journal of South American Earth Sciences. 126, 104361.
Leprieur F, Beauchard O, Blanchet S, Oberdorff T, Brosse S.(2018). Fish invasions in the world's river systems: when natural processes are blurred by human activities. PLoS biology. 6 (2).
Mathuriau C, Silva NM, Lyons J, Rivera LMM (2011). Fish and Macro invertebrates as Freshwater Ecosystem Bioindicators in Mexico: Current State and Perspectives. Water Resources in Mexico. USA: Springer. 251–61.
Mehmood, S., Ahmed, I., & Mushtaq, R. (2023). Physico-chemical Parameters and Freshwater Fish Diversity of Sip River Madhya Pradesh, India. Uttar Pradesh Journal Of Zoology. 44(7), 1-14.
Menon, S., Kumar, A., Middha, S., Paital, B., Mathur, S., Johnson, R., Kademan, A., Usha, T., Hemavathi, K., Dayal, S., Ramalingam, N., Subaramaniyam, U., Sahoo, D., & Asthana, M. (2023). Water physicochemical factors and oxidative stress physiology in fish, a review. Frontiers in Environmental Science. 11(2), 20-44.
Mondal, R., & Bhat, A. (2020). Temporal and environmental drivers of fish-community structure in tropical streams from two contrasting regions in India. PLoS ONE, 15(4): e0227354
Nababa, A., Bichi, H., & Olukayode, S. (2022). Itchthyofaunal Composition, Abundance, and Diversity Indices in Zobe Reservoir of Katsina State, Nigeria. UMYU Scientifica. 1(1), 42-48.
Napit, A. (2024). An Updated Review on the Role of Certain Physicochemical Parameters in Regulating Fish Diversity of Tropical Aquatic Ecosystems. Bioscience Biotechnology Research Communications. 17(4), 1-20.
Ogren SA. (2014). Using indicators of biotic integrity for assessment of stream condition. Michigan Tech; 7(5):10–9.
Ohaturuonye, S., Okeke, P., & Ukagwu, J. (2023). Assessment of fish distribution, composition and abundance in Otamiri River, Imo State, Nigeria. Journal of Aquatic Sciences. 38(1), 11-20.
Oketola, A.A, Osibanjo, O., Ejelonu, B.C., Oladimeji, Y.B and Damazio, O. (2016). Water Quality Assessment of River Ogun around the Cattle Market of Isheri, Nigeria.Journal of Applied Sciences, 6: 511-517.
Ongh, S., Landge, A., Ramteke, K., Borah, S., Barman, J., Akter, S., Yadav, A., Das, P., Majhi, S., Chakraborty, N., & Das, B. (2025). Fish community structure in accordance with environmental signatures in a tropical river ecosystem in the Eastern Himalayan ecoregion. Aquatic Sciences, 87(40), 1-27.
Pa, O., Ja, I., Ooc, E., & So, O. (2023). Studies on fish species diversity, abundance and Distributon along Onitsha axis of River Niger, Anambra State of Nigeria. International Journal of Multidisciplinary Research and Growth Evaluation. 4(4), 881-890.
Pacheco, F.A.L. and Sanches-Fernandes, F. L. (2016). Environmental land use conflicts in catchments: A major cause of amplified Nitrate in river water. Science of the Total Environment, 548, 173–188.
Roy, D., Didar, N., Sarker, S., Khan, M., & Latifa, G. (2022). Appraisal of different attributes of fish community in Andharmanik River of coastal Bangladesh and socio-economic conditions of fishermen. Heliyon, 8(7), e09825.
Saha, A., Paul, T., Sudheesan, D., Sharma, S., Suresh, V., Das, B., Manoharan, S., Vijaykumar, M., Samanta, S., & Jana, C. (2022). Assessment of Spatial and Temporal Changes in Water Quality of a Tropical River in Southern Western Ghats, Kerala, India, Using Physicochemical Quality Indices and Multivariate Analysis. Natural Resources Research, 31, 1375 - 1401.
Sandhya, K., Lianthuamluaia, L., Karnatak, G., Sarkar, U., Kumari, S., Mishal, P., Kumar, V., Panda, D., Ali, Y., & Naskar, B. (2019). Fish assemblage structure and spatial gradients of diversity in a large tropical reservoir, Panchet in the Ganges basin, India. Environmental Science and Pollution Research, 26, 18804-18813.
Tinotenda, M, Taurai, B. and Tongayi, M. (2016). Choice of biota in stream assessment and monitoring programs in tropical streams: A comparison of diatoms, macroinvertebrates and fish. Ecological Indicators, 63: 128–143.
Vyas, A., Radadia, B., Pandya, M., & Vyas, K. (2024). Assessment of Physico-Chemical Parameters and Zooplankton Diversity in Anandpur Dam, Junagadh, Gujarat, India. Assessment of Physico-Chemical Parameters and Zooplankton Diversity in Anandpur Dam, Junagadh, Gujarat, India. 42(5), 287-298.
Xiang, C., Weiqi, Z., Steward, T. A., Pickett, W., Li, L. and Han, Y. R. (2016). Diatoms are better indicators of urban stream conditions: A case study in Beijing, China. Ecological Indicators, 60: 265–274.
Yongo, E., Mutethya, E., Jin, F., Zhang, P., Lek, S., Mo, L., Li, J., & Guo, Z. (2023). Spatio-temporal variation in water quality and phytoplankton community structure in Changwang, Meishe, and Wuyuan Rivers in Hainan Island, China. Environmental Monitoring and Assessment, 195, 1-23.
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