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Articles by N. John Samuel
Total Records ( 3 ) for N. John Samuel
  P. Soundarapandian , N. John Samuel , S. Ravichandran and T. Kannupandi
  In this study, the distribution of crabs in Pichavaram was recorded from December 2001 to November 2002 at monthly intervals. The species present on the substratum and on the vegetation area were recorded in quadrant each measuring 1 m2. There are about 36 crabs species are distributed in Pichavaram mangrove environment. Crabs belonging to the family Grapsidae and Ocypodidae are most dominant forms. Substrate suitability; effects of tidal inundation and distribution of mangrove plants were the possible factors that could influence zonation and abundance of the crabs in the Pichavaram mangroves. The reason for depletion of crabs and their conservation measures are also discussed.
  P. Soundarapandian , K. Balamurugan and N. John Samuel
  P. Soundarapandian , E. Thamizhazhagan and N. John Samuel
  To establish a commercial hatchery in crabs a mass seed production experiment was conduced in the blue swimming crab, Portunus pelagicus. It undergone 5 zoeal and I megalopa stage. The larvae took 24.3 days to complete their cycle. The rotifer (Brachionus plicatilis) and Artemia nauplii were provided as feed for the larval forms. The survival rate decreases with increasing larval stages. While, larval duration increases with increasing larval stages. Maximum survival (71.6%) was reported in I zoea and minimum (4.3%) was in Megalopa when metamorphosed into Ist crab instar. Initially the larvae took 3 days to reach the next stage (I-IV stage). It was 4-5 days for the later stages (IV-Ist crab instar). Mortality and cannibalism is a common problem encountered during the study period. The reason for the mortality and cannibalism is discussed in detail.
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