The effect of zeolite (Clinoptilolite) in removing ammonia lethal concentration in Rainbow Trout (Oncorhynchus mykiss)

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Abstract

Clinoptilolite efficiency on absorption of ammonia in rainbow trout was studied. The fish
specimens weighted 9.5-21g and were exposed to four different concentrations of total
ammonia as N-NH4 including: 10, 15, 20, and .25mg/l. A group of 13 fish was considered as
control. Lethal concentration was determined after 24 hours. Under stable temperature and pH
conditions (T= 16±1 C, pH= 7.7±1), the lethal concentration of total N-NH4 was 25mg/l (as
ionized N-NH3=0.44mg/l based on temperature and pH). In lethal concentrations of ammonia,
different amounts of zeolite (2, 5, 10, 13 and 15g/l) were used. Application of 15g/l of the
zeolite prevented mortalities in the fish. A significant difference was found in reduction of
total ammonia and total hardness through application of zeolite after 24 hours (P

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Iranian Scientific Fisheries Journal
Volume 20, Issue 1
September and October 2011
Pages 101-110

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