Journal of Environmental Biology

Studies on the identification and control of pathogen Saprolegnia in

selected Indian major carp fingerlings at mid hill altitude

Author Details

S.K. Das

ICAR Complex for North Eastern Hill Region, Barapani-793 103, India. ??

K. Murmu

ICAR Complex for North Eastern Hill Region, Barapani-793 103, India.? ?

A. Das

ICAR Complex for North Eastern Hill Region, Barapani-793 103, India.? ?

I. Shakuntala

ICAR Complex for North Eastern Hill Region, Barapani-793 103, India.? ?

R.K.Das

ICAR Complex for North Eastern Hill Region, Barapani-793 103, India. ??

S.V.Ngachan

ICAR Complex for North Eastern Hill Region, Barapani-793 103, India.? ?

S.K. Majhi

(Corresponding author)

Division of Fisheries, ICAR Complex for North Eastern Hill Region, Barapani-793103, India.?

e-mail : sullipkm@gmail.com

Publication Data

Paper received:

22? July 2010

Revised received:

15 May 2011

Accepted:

06 August 2011

Abstract

The Indian major carp cultured in ponds in the North Eastern hilly states of India frequently suffer from fungal disease during winter months resulting in mass mortality. This study examined the pathogenic fungi isolated from farmed raised Indian major carp fingerlings and identified as Saprolegnia. For treatment, the diseased fish were exposed to 4g salt per litre of water for 2 min followed by dip treatment with 5ppm KMnO₄ for 10 min, thrice every week for a period of 6 weeks. The treatment resulted in recovery from the disease after 6 weeks from the beginning of treatment. Soon after recovery, the pond management practices such as removal of pond bottom soil, application of lime and replenishment with freshwater were followed in the infected ponds. Our study concluded that rapid decrease in pond water temperature from 22 to 8^?C that remains low for months together coupled with increased water pH (9) and decreas dissolved oxygen (4ppm) causes saprolegniasis to the fingerlings of Indian major carps. ??

Key words

Saprolegnia, Pathogenic fungi, Major carp?

Copyright ? 2012 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).