This experiment is based on determining a fixed level of fertilization of 0.5 g/L (sheep and cow waste) in experimental treatments with the cultivation of the Hydrilla plant at two different densities (2 and 4 g/L) to determine its growth capacity and productivity within the experimental period of 40 days. The purpose of the experiment is to benefit from Hydrilla as an alternative of expensive imported fodder materials and contribute to solving the problem of scarcity of fodder materials and their high prices. The environmental conditions affecting its development and Production such as temperature, pH value and the effect of harvest periods on plant Productivity were Studied, The results showed a significant superiority at probability (P ≤ 0.05) of the first treatment with a density of 2 and 4 g/L of sheep manure fertilizer in plant growth and production, there was an increase in the final weight, total and daily weight gain, and the percentage of relative weight gain, reaching (164.67, 56.67, 1.42 g, and 52.47%) and (247.00, 31.00, 0.78 g, and 14.35%) respectively compared with the second treatment of cow manure. In general The two fertilization treatments (sheep and cow manure) with a plant density of 2 g/L are better than the two treatments of 4 g/L in the production percentage of the Hydrilla plant during the experimental period. There was a superiority in growth and productivity using a plant density of 2 g/L when fertilizing the medium with 0.5 g/L of sheep manure over the rest of the treatments, which are recommended to be used during the development of the Hydrilla plant in the future. The harvesting process affects the plant's productivity, where the plant recovers slowly during repeated harvesting for short periods of time. It is recommended that the harvesting density be low, which enhances its ability to grow effectively.