Environ Toxicol Pharmacol. 2005 Feb;19(2):351-5. doi: 10.1016/j.etap.2004.09.001.
Impact of fertilizer (urea) on oxygen consumption and feeding energetics in the fresh water fish Oreochromis mossambicus.
Source
Department of Zoology, Periyar Arts College, Cuddalore, Tamil Nadu, India.Abstract
The
effects of urea on survival, food utilization and oxygen consumption of
the fresh water fish Oreochromis mossambicus were studied. The
percentage survival of O. mossambicus when exposed to different
concentrations of urea at 24, 48, 72 and 96h exposures was noted and it
was found that 22,000 and 38,000mgL(-1) urea concentration were
sublethal and lethal, respectively. The median lethal concentration,
which killed 50% of the fishes during 96h exposure, was 28,000mgL(-1).
Rearing the fish in increasing sublethal concentrations of urea, it was
found that the feeding rate decreased from
34.341±7.067mgglivefish(-1)d(-1) (control) to
13.921±2.315mgglivefish(-1)d(-1) at the highest concentration of urea
(22,000mgL(-1)). Growth rate was drastically reduced. The consumption of
oxygen in O. mossambicus diminished from 0.962±0.208 to
0.645±0.118mgglivefish(-1)h(-1) when reared in the highest sublethal
concentration of urea.
- PMID:
- 21783495
- [PubMed]
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