Influence of lead nitrate upon organogenesis of Hypophthalmichthys molitrix
Eggs of Hypophthalmichthys molitrix have been subjected to lead nitrate in dosages of 0.01 ppm up to 20 ppm and it was observed that sample of more than 12 hours before were resistant to lead nitrate. Also it was observed that is sample of more orc than 32 hours lead increased mortality rate and abnormalities. These samples lost body length avid accumulated lead in their tissues. Lead affected thickness of retina layers in the eyes of swim fry's and in dosages of 1 to 20 ppm decreased thickness of these layers from 6% to 12%, Nearly 50 percent of new larvae in dosage of 1 ppm and 100 percent of them in dosage of 20 ppm showed symptoms of lordosis is abnormality. No meaningful histopathological effect was seen by affecting lead nitrate on eye lenses optic capsule, ventricles, notochord and yolk sac of these larvae, Average lead nitrate concentration in Anzali Wetland is 0.124+0.0507 ppm in surface waters and 0.1956t+0.385 ppm in deeper waters. This level of lead pollution in Azali Wetland caused 8 percent of silver carp fertilized eggs to death and it is demonstrated that at this rate of pollution nearly I8 percent of these eggs will be valueless from the fishery viewpoint.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | Persian |
| Published: |
1993
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| Subjects: | Biology, Fisheries, Nitrate, Eggs, Tissues, Lead, Surface, Pollution, Organogenesis, Histopathological, Hypophthalmichthys molitrix, Anzali Wetland, Iran, |
| Online Access: | http://hdl.handle.net/1834/38267 |
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