How to Cite: Naji, M. H., & Alzurfi, S. K. L. (2022). Can aquatic plant (Eichhornia crassipes) be used as a partial substitute for carp fish feed?. International Journal of Health Sciences, 6(S5), 8125–8135. https://doi.org/10.53730/ijhs.v6nS5.10843 International Journal of Health Sciences ISSN 2550-6978 E-ISSN 2550-696X © 2022. Manuscript submitted: 9 April 2022, Manuscript revised: 18 June 2022, Accepted for publication: 27 July 2022 8125 Can aquatic plant (Eichhornia crassipes) be used as a partial substitute for carp fish feed? Mustafa Hassan Naji Department of Ecology and pollution, Faculty of science, University of Kufa, Iraq Sadiq Kadhum Lafta Alzurfi Department of Ecology and pollution, Faculty of science, University of Kufa, Iraq Email: sadiqk.alzurfi@uokufa.edu.iq Abstract---This study was conducted to evaluate the possibility of using Eichhornia crassipes as a partial substitute for vegetarian meals to reduce the cost of feeding fish. Eichhornia crassipes powder was included in fish feed at different levels (0%, 25%, 50%, 75% and 100%), and it was fed in Cyprinus carpio L. farms using plastic container for 45 days. The obtained results showed that the final weight gain and specific growth rate (SGR) was (15.83; 9.8) gm respectively in the first treatment during the 45 th day, highest percentage compared to the control treatment. Non-Significant differences were observed between treatments and days in feeding fish at p˃0.05 compared with the control treatment. The average intestines length of fish shows the highest increase in the first treatment compare to control, and it may be the best criterion for growth with this concentration. We conclude that the E. crassipes (25%) can be replaced as a partial substitute for meals. Therefore, experiments at other concentrations of lower than 25% are recommended to reach the best growth standards. Keywords---Eichhornia crassipes, Cyprinus carpio, Fish meal, Rate growth, SGR. Introduction Common carp (Cyprinus carpio) is one of the most important farmed freshwater fish species globally (Pauly & Froese, 2012). Fish is an important source of food and protein. Humans obtain 14% of animal protein from fish. They also constitute an important source of national income for many countries. Moreover, fish contribute to achieving food security (Ali, 2020). The increasing demand for fish meat consumption in recent times is a major factor of decreasing the productivity of the interior water surfaces and hence causing a nutritional gap. This led to