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Articles by K. Raja
Total Records ( 2 ) for K. Raja
  Olivia J. Fernando , K. Raja and T. Balasubramanian
  Amphiprion sebae kept in the recirculating Marine Research Aquarium spawned a maximum of 0.8 times per month throughout the year. This is the first spawning record from a recirculating aquarium environment. Generally the spawning of A. sebae has been described from fresh seawater by various authors. The present study mainly observes the maintenance of brooders, their pairing and spawning in recirculating aquarium environment. Among the 54 adult fishes collected from the natural environment, three pairs are formed in the aquaria. The parental care of egg guarding male was observed. Three pairs are fed with different feed i.e., prawn meat, fish meat and a combination of prawn, fish and clam meats. The spawning frequency was observed to be moderately high (0.8/month) when fed with the mixed feed, whereas a frequency of 0.5 and 0.6 per months was observed when fed with prawn, fish meats respectively. The maximum clutch size (911) was observed also in mixed feeds and it was minimum (395) when the pairs were fed with fish meat alone. The increase in the frequency of spawning was during summer months compared to other months.
  M. Karuppaiyan and K. Raja
  The settlement pattern of barnacles, Balanus amphitrite amphitrite (Darwin) and oysters Crassostrea madrasensis (Preston) and Saccostrea cuccullata (Born) on the stilt roots of the mangrove tree Rhizophora apiculata (Blume) bordering the intertidal region of Pichavaram mangrove (Lat. 11° 27 N Long. 79° 47 E) has been studied with reference to the tidal oscillation. Vertically, settlement was found to be abundant on stilt roots occurring at low tide than at mid and high tide levels. This differential settlement could be attributed to the adaptability of these organisms to their tolerance to extended period of either tidal submersion or emersion. Vertically both the oysters settled preferably at the bottom of part stilt roots indicating their inability to tolerate long period of exposure. S. cuccullata occurred above the level of C. madrasensis suggesting that the former could tolerate comparatively a more extended period of exposure. Settlement was high during late post monsoon and early summer coinciding with the abundant of high phytoplankton, the optimal temperature and salinity, for the growth and breeding of these benthic organisms.
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