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Subject: Zoology × Author: Jakhar, Vijayanti × End date: 2006 × Start date: 2002 × Type: Thesis ×
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    ThesisItemOpen Access
    Isolation and characterization of disease causing agents in freshwater prawn (Macrobrachium rosenbergii)
    (CCSHAU, 2006) Jakhar, Vijayanti; Gahlawat, S.K.
    A variety of diseases have been observed in larval, juvenile and adult freshwater prawns viz. as tail rot, larval mid cycle, bacterial necrosis, black spot disease, body cramp, black gills, and vibriosis in three selected fish farms (Ladwa, Mirka farm, Hisar and Charanjeet farm, Hansi) from July to December,2005. Tail rot disease was found in all the months during the course of work. The emergence of disease is actually the result of the interaction between abiotic and biotic factors. Keeping in view the above facts, the present investigations were carried out to identify disease causing pathogens in freshwater prawn, M. rosenbergii. A number of biochemical tests were performed on sugars, alcohol and amino acid etc were carried out for the identification of bacterial pathogens. Eighteen gram - negative rods (Aeromonas hydrophila, Enterobacter aerogenes, Escherichia coli, Klebsiella oxytoca, Kl. pneumoniae subsp. aerogenes, Kl. pneumoniae subsp. ozaenae, Citrobacter freundii, C. koseri, Pseudomonas aeruginosa, P. alcaligenes, P. putida, P. stutzeri ,P. fluorescens,Vibrio alginolyticus, V. splendidus, V. logei, V. parahaemolyticus, V. diazotrophicus, V. fluvialis) three gram positive - bacilli (Lactobacillus casei, L. brevis, L. lactis) and five gram - positive cocci (Micrococcus luteus1, M. varians, Cellobiosococcus sciuri, Staphylococcus aureus, Streptococcus grp Q1) were found associated with these diseases. Fluctuations in optimum range of physicochemical parameters provide optimum environment for the growth of bacterial pathogens which resulted the prawns in stress conditions and hence, causes diseases.