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- Title
Trend in Ammonia Excretion during Acclimatization of Adult Freshwater Red Hybrid Tilapia Oreochromis mossambicus (Peters, 1852) X Oreochromis niloticus (Linnaeus, 1758) in Different Salinities.
- Authors
Pradeep, P. J.; Srijaya, T. C.; Hussain, A.; Mithun, S.; Shaharom, F.; Chatterji, A.
- Abstract
An attempt was made to study the trend in ammonia excretion by red hybrid tilapia during their acclimatization in seawater under slow and sudden conditions. Acclimatization of salinity 5 ppt showed an increase of ammonia level in water by 83.35% (7.69 mg/kg/l/day) as compared to the control group (P<0.05) whereas the value was 24.97% (10.25 mg/kg/l/day) at 10 ppt. The level of ammonia was dropped at salinity 15 ppt (5.12 mg/kg/l/day) by 50% and 25% at 20 ppt (3.84 mg/kg/l/day). The ammonia level with sudden transfer to different salinities were; 1.94, 1.38 and 2.77 mg/kg/l at 10, 20 and 30 ppt respectively, after 2 hrs of acclimatization whereas it reached to 11.11 mg/kg/l at 10 and 20 ppt within 24 hrs. All fishes were found dead within 3 hours of their sudden transfer to 30 ppt. The Results suggest that a gradual salinity increase is beneficial for acclimatizing marine tilapia.
- Subjects
MARINE fish anatomy; MOZAMBIQUE tilapia; ACCLIMATIZATION; EXCRETION; SEAWATER salinity; AMMONIA; BIOLOGICAL adaptation; WATER levels
- Publication
Our Nature, 2011, Vol 9, Issue 1, p34
- ISSN
1991-2951
- Publication type
Article