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Articles by S. Muthuvelu
Total Records ( 2 ) for S. Muthuvelu
  S. Purusothaman , S. Muthuvelu , U. Balasubramanian and P. Murugesan
  A study was carried out to evaluate the effect of vermiwash supplementation on silk worm Bombyx mori. The vermiwash was diluted to different concentration as 10, 25 and 50%. Fresh mulberry leaves were sprayed by each concentration of vermi wash. The leaves were then fed to silk worms from 5th instar stage onwards at four times per day. Group 1 larvae received mulberry leaves without vermiwash spray and served as control, group 2 larvae received 10% vermiwash sprayed mulberry leaves, group 3 larvae received 25% vermiwashsprayed mulberry leaves and group 4 larvae received 50% vermiwash sprayed mulberry leaves. Weight of larvae, silk gland, cocoon, pupa and shell weight of silkworm was significantly increased. Minimum larval weight (2.160 g) was in control and maximum (3.416 g) was in 50% enriched larvae. Silk gland weight of control, 10, 25 and 50% enrichment was 0.511, 0.552, 0.661 and 0.738 g, respectively. The cocoon weight of control, 10, 25 and 50% treatment was 1.065, 1.243, 1.296 and 1.374 g respectively. The shell weight of control (0.171 g) was lower than 10% treatment (0.198 g), 25% treatment (0.247 g) and 50% treatment (0.315 g). There was significant increase in the carbohydrate, protein and lipid of fat body and mulberry leaves. Acid phosphatase and alkaline phosphatase are significantly increased in the body of B. mori.
  P. Murugesan , S. Purusothaman and S. Muthuvelu
  Usage of trawl nets has been perceived as one of the major threats to marine biodiversity and to the sustainability of marine fisheries. In the present study, trophic level of fishes associated with bycatch of bottom trawling off Parangipettai and Cuddalore were studied. Stratified random sampling method was followed from each trawl and fish species collected were identified to species level. As many as 46 species in Parangipettai and 51 in Cuddalore waters were recorded. Among them, demersal and reef associated species were found to be dominant groups in both the regions. As regards trophic level (Trl), species accounting for 37% (17 species) in Parangipettai and 40% (20 species) in Cuddalore waters belonged to the trophic level 3.0-3.49 followed by 23.9% (Parangipettai) and 31.3% (Cuddalore) to 4.0-4.5. The number of species recorded in other trophic was less in both the coasts. Diversity indices paralleled the trend of maximum percentage of species recorded in the trophic levels. In all the trophic levels, juveniles (below 15 cm) were landed in large proportions in the trawl bycatch. Reduction of fishing pressure and use of bycatch reduction devices are suggested for the conservation and better management of marine fisheries in the Southeast coast of India.
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