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Title: Occurrence of red tide caused by Karenia mikimotoi (toxic dinoflagellate) in the Southwest coast of India
Authors: Madhu, N V
Reny, P D
Paul, Meenu
Ullas, N
Resmi, P
Keywords: Dinoflagellate bloom;Karenia mikimotoi;Cochin estuary
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
Abstract: Intense brownish discoloration was observed in the surface waters of Cochin barmouth on 21st October 2009, which found to extend a few kilometers in the coastal waters. Continuous monitoring was carried out in the region for a period of 5 days (21st to 25th October 2009) and generated data on changes in water quality and phytoplankton community associated with the bloom. Relatively high level of inorganic nutrients (ammonia 0.5-9.7 µM, nitrate 1.3-2.9 µM, phosphate 1-2.3 µM, silicate 23.5-39.9 µM) and chlorophyll a (av. 56.8 ± 23.7 mg m-3) concentration were observed during the bloom period. Microscopic analysis revealed that the discoloration was caused by an unarmored toxic dinoflagellate, Karenia mikimotoi Miyake & Kominami ex Oda (Karenia, Gymnodiniaceae) belongs to Gymnodiniales, which cause massive fish mortality by releasing hemolytic compounds.
Page(s): 821-825
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.40(6) [December 2011]

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