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Adding natural product such as Humic acid (Humabol) and Yucca schidigera extract to enhance water quality under scarce water exchange regiment; has numerus effects on both fish environment and health. Yucca showed significant reduction on NH 3 and NO 2 levels, while humic acid showed significant reduction on orthophosphate and total phosphorus compared to negative control; in addition to maintaining acceptable growth rate under designed experimental conditions. Furthermore, the hematological study showed that, Yucca and humic had positive effect on Red cell indices values such as, HCT, MCV, MCH, MCHC as well as WBCs total count and the proportion of the NEU, MONO, ESO and LYM of the treated treatments. Also, the histological study of gills, liver, stomach and intestine highlighted the tissue protective effect manifested by Yucca and humic.

Dyes considered harmful pollutants that represent a serious threat to the aquatic environment, which require expensive materials to get rid of. It is consequently producing a critical situation that requires the availability of all efforts to solve, especially in conditions of water scarcity expected in the near future. Hence, the urgent need, to use cheap and eco-friendly adsorbents instead of traditional materials to purify and reuse water several times. It becomes one of the most important motives for conducting this research. This experiment was conducted, to compare the effect of using low cost adsorbent material against a traditional one with various dosages and various contacting periods at an ambient conditions of pH and temperature that are suitable for aquatic animals to remove Methylene Blue (MB) dye residues from water. The highest removal efficiency percentages of 0.1 g chitosan and silica gel toward 100 mg/l of MB dye were 93.1 % and 86.9 % respectively, after 60 minutes of contacting period. The equilibrium adsorption behavior data were fitted well to Langmuir and Freundlich adsorption isotherm models. Based on the achieved results, we recommend that the use of chitosan in purifying the aquatic environment from some organic pollutants such as dyes, which are widely used in many industries, because of the advantages of chitosan, which are low cost, wide availability and completely safe for the environment.