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Articles by D. Senthamilselvan
Total Records ( 3 ) for D. Senthamilselvan
  A. Chezhian , D. Senthamilselvan and N. Kabilan
  Ammonia is one of the serious problems in fish culture especially in recirculation systems, aquaria and fish ponds. The effect of ammonia exposure at different pH levels on gills of common carp Cyprinus carpio was studied for 96 h. The median lethal concentration (LC50) of ammonia for 96 h was 22 ppm, ammonia with low pH (5.0) was 27 ppm and ammonia with high pH (8.0) was 18 ppm. In the present study ammonia and different pH levels induced several changes in the fish gills like lamellar fusion, edema, hyperplasia, chloride cell proliferation and fusion in secondary lamella as compared with control. The impact of gill epithelium was less in ammonia and ammonia with low pH exposed fish than ammonia with high pH exposed fish. These parameters are indicative of pH dependence of ammonia toxicity and gill histology may be used as early indicators of toxicity in aquatic animals.
  D. Senthamilselvan , A. Chezhian and E. Suresh
  In this study, the effect of nickel (Ni), mercury (Hg) and nickel plus mercury (Ni+ Hg) on fatty acid composition in the muscle tissues of fish Lates calcarifer has been investigated. It was determined from the results of 96 h metal exposure period of fish, depending on Ni, Hg and Ni plus Hg concentration, the amount of saturated fatty, mono unsaturated fatty acid and poly unsaturated fatty acids in fish were decreased when compared with control group (p<0.05). It was also found that Ni, Hg and Ni plus Hg had reduced effects on palmitoleic, linoleic, arachidonic acid, eicosapentaenoic, decosapentaenoic and docosahexaenoic belong to unsaturated fatty acid in muscle tissue. The data demonstrated the necessity for regular monitoring of the hazard quotient for food fish in wild conditions.
  D. Senthamilselvan and A. Chezhian
  Ammonia is a naturally occurring highly toxic environmental pollutant. Lethal effects of ammonia (22 ppm) on the biochemical changes of fresh water teleost, Cyprinus carpio was studied in FT-IR spectroscopy. The fish exposed to lethal concentrations of ammonia for 96 h showed altered membrane lipids, altered protein profiles and increased glycogen were recorded. Likewise the decrease in α-helix and an increase in random coil structure were also observed when the fish was exposed to lethal concentrations of ammonia. The present study suggests that FT-IR spectroscopy on the muscle tissues on above said fish can be used as a rapid and inexpensive tool in toxicological research and are good biomarkers for field assessment in areas that are subject to a multiplicity of environmental variations.
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