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Articles by D. Yuvaraj
Total Records ( 2 ) for D. Yuvaraj
  R. Karthik , Angelin C. Pushpam , K. Ramalingam , D. Yuvaraj and M.C. Vanitha
  Shrimp farming is one of the most important aquaculture and economically lucrative practices of maritime countries. Providing a Specific Pathogen Free (SPF) shrimps to the farmers is a big challenge that must be addressed to meet the demand. In general, microalgae are utilized in aquaculture as a live feed for the shrimps. However, their importance in the attenuation of negative impacts of pathogenic microbial load, eutrophication and promotion of shrimps growth has to be delineated by experimental investigations to justify the above specific pathogen free shrimps. The present study was carried out to investigate the feeding of five different microalgae and algae enriched Artemia salina. Nauplii on digestive enzyme activity, growth, survival rate, microbial load on Penaeus monodon and Litopenaeus vannamei from zoea to post larvae (20 stages) and other water quality. Microalgae such as Isochrysis galbana, Cheatoceros calcitrans, Tetraselmis sp., Chlorella sp. and Nannochloropsis sp. were obtained from AMET Microbial Culture Collection Centre, Department of Marine Biotechnology, AMET University. Penaeus monodon and Litopenaeus vannamei at PL 20 stage showed maximum protease and amylase (digestive enzyme) activity, maximum length and survival rate when fed with Artemia salina nauplii enriched with C. calcitrans followed by Chlorella sp. On studying the water quality parameters such as, pH, temperature, salinity, dissolved oxygen and ammonia it was found better in tank II where the shrimps were fed with Artemia salina enriched with C. calcitrans. Regarding the vibrio load at different stages of P. monodon and L. vannamei larvae and cultured water it was comparatively lower in tank II, where the shrimps were fed with Cheatoceros calcitrans and enriched Artemia salina than other groups. It is concluded that, the use of Cheatoceros calcitrans and enriched Artemia salina will reduce the potential negative impacts in the environment and promote production of shrimp larvae in hatcheries and fetch benefits to local economies.
  D. Yuvaraj and R. Karthik
  Biosecure zero-exchange systems represent an emerging technology that provides a high degree of pathogen exclusion with minimal water exchange. An important ramification associated with reduced or zero water exchange is the increased importance of in situ microorganisms both in regulating biogeochemical cycles within the culture environment and in directly affecting shrimp growth and survival. The newest attempt to improve water quality and control diseases in aquaculture is the application of probiotics and/or enzymes to ponds. This concept of biological disease control, particularly using microbiological modulator for disease prevention has received widespread attention. Keeping the above points in mind, this work was performed with zero discharge using probiotics, monitoring all the physico-chemical parameters and nutrients. The microbial population of the water and sediment were analyzed throughout the culture period. Highlights of this study are, (a) In the experimental ponds 1 and 2, the shrimps had a better growth (34.5 and 32.6 g, respectively), compared to 29.8 g in the control pond and (b) There was no incidence of disease in the experimental ponds, whereas the control pond had some bacterial infections. These encouraging results may be attributed to the use of probiotics in zero water exchange system.
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