NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.38 [2009] >
IJMS Vol.38(1) [March 2009] >

Title:  Effect of Chattonella marina [(Subrahmanyan) Hara et Chihara 1982] bloom on the coastal fishery resources along Kerala coast, India
Authors: Jugnu, R
Kripa, V
Keywords: Chattonella marina
fishery impact
drift net
ring seine
taxonomic distinctness
Issue Date: Mar-2009
Publisher: CSIR
Abstract:  Chattonella marina, a marine raphidophyte algae which produces haemolytic compounds is capable of damaging fish gills. Blooms of this algae were observed along North Kerala during September 2002, reaching maximum cell density 28×107 cells l-1 and in September 2003 with maximum cell density of 135×105 cells l-1. This results in massive fish kills. During the bloom period hypoxic conditions prevailed with dissolved oxygen content ranging between 0.22 and 1.92 mg l-1 To assess the impact of the bloom on the coastal fishery resources of the region, the fish landing data of five gears such as outboard trawl net, outboard drift net, outboard gill net, outboard ring seine and country craft gill net were analysed in detail. The landings of fishes which belonged to lower trophic levels decreased. Fishes which were mainly zooplankton feeders like Stolephorus spp, Thryssa and Leiognathus were entirely absent. But there was an increase in catch of the predatory fishes mainly Euthynnus, Trichiurus, Carcharhinus, Saurida, Scoliodon, Scomberomorus, and Sepia spp which occupy higher trophic level. The variation in catch rate between the bloom and the non-bloom period was significant (P<0.05) for Cynoglossus spp, Johnius spp, Thryssa spp and Parapenaeopsis stylifera caught in the outboard trawl net. The average taxonomic distinctness (Delta+) was lower during the bloom period and a clear shift in the community structure was observed. The effect of the C. marina bloom on fish community was short-lived, and the taxonomic diversity was restored soon after the bloom subsided.
Page(s): 77-88
ISSN: 0379-5136
Source:IJMS Vol.38(1) [March 2009]

Files in This Item:

File Description SizeFormat
IJMS 38(1) 77-88.pdf396.85 kBAdobe PDFView/Open
 Current Page Visits: 696 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 162723 since 01-Sep-2015  Last updated on 21-Jun-2016Webmaster: