Study on relationship between soil and water redox potential and aquatic animals toxic reducing agents with special cases of Tilapia (Oreochromis niloticus) and Tiger prawn (Penaeus monodon Fabricius) under intensive culture in aquaria
1995
Pornpun Yutharaksanukul
Results from the experiments in soil - water system indicated significant (P0.05) and highly significant (P0.01) correlation between the nitrite in water and redox potential of water at 0, 5 and 20 ppt. Highly significant correlation were also found between sulfide in water and redox potential of water at 20 ppt, and between sulfide in water and redox potentail of soil at 0 and 35 ppt. Significant difference were also observed between redox potential, Fe ** (2+) and Mn ** (2+) of water and soil of treatment using acid sulfate soil comparing to other treatments using normal clay and sandy soil. In intensive culture system of tilapia and tiger prawn, highly significant correlation were found between redox potential of water and soil. The decrease in redox potential of water and soil result in higher concentration of nitrite and ammonia in water, in all experimental systems with aeration, except the treatment using CaCO3 in tilapia culture system. In tilapia culture system without aeration, the decrease in redox potential of water and soil resulted in the decrease in nitrite and the increase in Fe ** (2+) and sulfide causing total mortility of experimental fish within 9 days.
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