Growth and Reproductive Biology of Shilluk, Leuciscus vorax (Heckel, 1843), in the Third River / central Iraq
DOI:
https://doi.org/10.48165/ijar.2025.46.03.22Keywords:
Water quality, Gonadosomatic index, Relative fecundityAbstract
This study was conducted on several environmental parameters, and some reproduction physiological processes of the Shilluk fish Leuciscus vorax were conducted alongside the Third River throughout central Iraq between the months of January and December of 2022. The results indicated that the temperatures of the water ranged from 10.1°C in January to 34.7°C throughout July. Every month, the acidity value varied between 6.4 and 8.3. The total dissolved solids (T.D.S.) average each month varied between 4.04 ppt and 7.41 ppt. The oxygen content in the solution varied between 9.22 and 6.9 mg/L. Throughout the course of the research, data from 106 L. vorax specimens were gathered. The hormonal Gonadosomatic Index (GSI) as well as the formation of gonads was examined in order to estimate the fertilization time. The results show that this kind of organism undergoes one reproductive cycle annually, with spawning events taking place between the months of January and February. The overall length (TL) of the individuals varied from 10.83 to 53.1 cm. Comparative reproductive estimates varied between 63388 to 79695 eggs per kilogram of weight of the person, and eggs lengths at maximal maturation varied from 1.5 to 1.64 mm.References
Worm, B., Orofino, S., Burns, E. S., D’Costa, N. G., Manir Feitosa, L., Palomares, M. L., & Bradley, D. (2024). Global shark fishing mortality still rising despite widespread regulatory change. Science, 383(6679), 225–230.
Coad, B. W., & Bogutskaya, N. G. (2010). Petroleuciscus esfahani, a new species of fish from central Iran (Actinopterygii: Cyprinidae). Zootaxa, 2534(1), 37–47.
Pantulu, V. R. (1963). Studies on the age and growth, fecundity and spawning of Osteogeneiosus militaris (L.). Journal du Conseil / Conseil Permanent International pour l’Exploration de la Mer, 28, 295–315.
Menon, S. V., Kumar, A., Middha, S. K., Paital, B., Mathur, S., Johnson, R., & Asthana, M. (2023). Water physicochemical factors and oxidative stress physiology in fish: A review. Frontiers in Environmental Science, 11, 1240813.
Eskuche-Keith, P., Hill, S. L., López-López, L., Rosenbaum, B., Saunders, R. A., Tarling, G. A., & O’Gorman, E. J. (2024). Temperature alters the predator–prey size relationships and size-selectivity of Southern Ocean fish. Nature Communications, 15(1), 3979.
Zhuang, J., Wang, Y., Lin, J., Zhang, D., Peng, Q., & Jin, T. (2024). Research progress and framework on the simulation and assessment of fish habitat degradation in lakes. Ecological Indicators, 158, 111461.
Bulbul Ali, A., & Mishra, A. (2022). Effects of dissolved oxygen concentration on freshwater fish: A review. International Journal of Fisheries and Aquatic Studies, 10(4), 113–127.
Al-Dabical, A. Y., & Al-Daham, N. K. (1995). The growth of Aspius vorax (Heckel) in the first year of age at Shatt Al-Basrah Canal. Marina Mesopotamica, 8, 344–354.
Szypula, J., Epler, P., Bartel, R., & Szczerbowski, J. A. (2001). Age and growth of fish in Lakes Tharthar, Razzazah and Habbaniya. Archives of Polish Fisheries, 9, 185–197.
Oymak, S. A., Ünlu, E., Parmaksiz, A., & Dogan, N. (2011). A study on the age, growth and reproduction of Aspius vorax (Heckel, 1843) (Cyprinidae) in Atatürk Dam Lake (Euphrates River), Turkey. Turkish Journal of Fisheries and Aquatic Sciences, 11, 217–225.
Honji, R. M., de Mello, P. H., & Araújo, B. C. (2025). Reproduction and development in fish: Solving bottlenecks in modern aquaculture. Animals, 15(2), 145.
Shafi, M., & Jasim, B. M. (1982). Some aspects of the biology of a cyprinid fish Aspius vorax Heckel. Journal of Fish Biology, 20, 271–278.
Epler, P., Sololowska-Mikolajczyk, M., Popek, W., Bieniarz, W., Bartel, K., & Szczerbowski, J. A. (2001). Reproductive biology of selected fish species from Lakes Tharthar and Habbaniya in Iraq. Archives of Polish Fisheries, 9, 199–209.
Wagaw, S., Sisay, A., Bazezew, A., Enawgaw, Y., & Wosnie, A. (2024). Biological aspects of Oreochromis niloticus (Linnaeus, 1758) in Geray Reservoir (Ethiopia) for effective sustainable fisheries. Fisheries and Aquatic Sciences, 27(2), 100–110.
Ohlberger, J., Langangen, Ø., & Stige, L. C. (2022). Age structure affects population productivity in an exploited fish species. Ecological Applications, 32(5), e2614.
Books
American Public Health Association, American Water Works Association, & Water Pollution Control Federation. (2005). Standard methods for the examination of water and wastewater. American Public Health Association.
Book Chapters
Jawad, L. A. (2021). Macroplastic and microplastic in the freshwater environment of southern Iraq: Evidence obtained from freshwater fish species. In Tigris and Euphrates rivers: Their environment from headwaters to mouth (pp. 1353–1374). Springer.
Singh, V., Srivastava, R. K., & Bhatt, A. K. (2025). Dissolved oxygen and water quality. In Battling air and water pollution: Protecting our planet’s vital resources (pp. 111–120). Springer Nature.
Kumar, P., Babita, M., Kailasam, M., Muralidhar, M., Hussain, T., Behera, A., & Jithendran, K. P. (2023). Effect of changing environmental factors on reproductive cycle and endocrinology of fishes. In Outlook of climate change and fish nutrition (pp. 377–396).
Conference Papers
Al-Zaidy, K. J. (2021a). Water quality and conservation status of fish fauna of Main Outfall Drain, Al-Diwaniya City, Iraq. In IOP Conference Series: Earth and Environmental Science (Vol. 910, No. 1, Article 012062). IOP Publishing.
Al-Zaidy, K. J. (2021b). Study of some reproductive characteristics of Cyprinus carpio (L., 1758) from Main Outfall Drain in Al-Qadisiyah City, Iraq. In IOP Conference Series: Earth and Environmental Science (Vol. 735, No. 1, Article 012075). IOP Publishing.
Theses and Dissertations
Marshall, J. B. (2024). Spatial modeling of climate-induced distribution shifts: A predictive framework to support Pacific hake fishery management (Doctoral dissertation or master’s thesis).
Mutlak, F. M. (2012). Stock assessment of some fish species from East Al-Hammar Marsh, Southern Iraq (Doctoral dissertation). University of Basrah, Iraq.
Al-Muzaffar, R. A. (1999). The life and breeding of the shilluk Aspius vorax in the Garmat Ali River (Master’s thesis). University of Basrah, Iraq.
Al-Mukhtar, M. A. (1982). Biological study of two freshwater fish, Barbus luteus (Heckel) and Aspius vorax (Heckel), in Hammar Marsh, Basrah (Master’s thesis). University of Basrah, Iraq.
