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Study of ecological consequence of the bloom (Noctiluca miliaris) in off shore waters of the Northern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Study of ecological consequence of the bloom (Noctiluca miliaris) in off shore waters of the Northern Arabian Sea
 
Creator Dwivedi, R.M.
Chauhan, R.
Solanki, H.U.
Raman, M.
Matondkar, S.G.P.
Madhu, V.R.
Meenakumari, B.
 
Subject algal blooms
photoplankton
species diversity
fishery statistics
Noctiluca miliaris
 
Description Ship based observations during early March 2007 in oceanic waters of the Northeastern Arabian Sea followed by phytoplankton analysis indicated that the bloom Noctiluca miliaris, species of dinoflagellate, dominated oceanic waters of the basin during winter. Dark green discoloration was observed during February - early March. During the cruise FORV Sagar Sampada (SS-212) in February-March 2003, surface water samples measured 64?4128 cells.1sup(-1) and deeper layers (10-15 m) supported 1080-2542 cells.l-1 of Noctiluca. Chlorophyll concentrations were in a range 0.4-2.0 mg.m sup(-3), which reflect unusually high primary production in the deep waters (greater than 2000 m). A pattern of zooplankton showed unusually high growth in the bloom waters. Fish catch data (percent hooking rates of tuna) were obtained from Fishery Survey of India and were used to study response of fish to prevailing high productivity in the bloom waters. Fishing in oceanic waters within Indian EEZ indicated no adverse effect of bloom; rather remarkably higher catches resulted from long line operations in the bloom waters. Space-time variability in dissolved oxygen was studied to explain the observed preference of fish in the bloom waters.
 
Date 2012-10-15T09:19:53Z
2012-10-15T09:19:53Z
2012
 
Type Journal Article
 
Identifier Indian Journal of Geo-Marine Sciences, vol.41(4); 2012; 304-313
http://drs.nio.org/drs/handle/2264/4180
 
Language en
 
Rights ? IJMS/NISCAIR 2010. CC Attribution 3.0 License
 
Publisher CSIR-NISCAIR