Nile tilapia (O. niloticus) fingerlings averaging 19.0± 1.0 g in
weight where reared at four different concentrations of UIA-N
(0.01, 0.05, 0.1 and 0.15 mg/l) besides the control using 15 glass
aquaria (40 ×70 ×60 cm). Tilapia were stocked for 75 days and fed
with diet containing 26.58 % protein. The physico-chemical
analysis of water in aquaria were recorded. Water was changed
twice daily with 100% of water size. Different growth
measurements of tilapia were recorded every 15 days interval,
blood parameter and histo-pathological changes in kidney, liver and
gills were also recorded. The results showed that growth
performance was significantly (P≤ 0.05) decreased with increasing
concentration of UIA-N. The feed conversion ratio (FCR) increased
with increasing concentrations of UIA-N, the differences were
significant (P ≤ 0.05) among the high concentrations.
Histopathological changes showed different signs in liver, gill and
kidney among the four treatments. Increasing UIA-N
concentrations resulted in decreasing of hematocrit and
hemoglobin parameters, while differences were not significant (P≥
0.05) from control in UIA-N concentration (0.01mg/l). Also, results
showed that the 48 hr-LC50
for tilapia fingerlings was 7.1 mg/l NH3-
N.
Nile tilapia (O. niloticus) fingerlings averaging 19.0± 1.0 g in
weight where reared at four different concentrations of UIA-N
(0.01, 0.05, 0.1 and 0.15 mg/l) besides the control using 15 glass
aquaria (40 ×70 ×60 cm). Tilapia were stocked for 75 days and fed
with diet containing 26.58 % protein. The physico-chemical
analysis of water in aquaria were recorded. Water was changed
twice daily with 100% of water size. Different growth
measurements of tilapia were recorded every 15 days interval,
blood parameter and histo-pathological changes in kidney, liver and
gills were also recorded. The results showed that growth
performance was significantly (P≤ 0.05) decreased with increasing
concentration of UIA-N. The feed conversion ratio (FCR) increased
with increasing concentrations of UIA-N, the differences were
significant (P ≤ 0.05) among the high concentrations.
Histopathological changes showed different signs in liver, gill and
kidney among the four treatments. Increasing UIA-N
concentrations resulted in decreasing of hematocrit and
hemoglobin parameters, while differences were not significant (P≥
0.05) from control in UIA-N concentration (0.01mg/l). Also, results
showed that the 48 hr-LC50
for tilapia fingerlings was 7.1 mg/l NH3-
N.
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