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Monospecific bloom of noxious raphidophyte Chattonella marina in the coastal water of South West coast of India

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Author(s): Kunnatholickal Balakrishnan Padmakumar 1* , Lathika Cicily Thomas 1 , Thaliyakkattil Chandran Salini 1 , Elizabeth John 1 , Narayana Ravindranatha Menon 2 , Veloorkirakathil Narayana Sanjeevan 1

Journal: International Journal of Biosciences
ISSN 2220-6655

Volume: 1;
Issue: 1;
Start page: 57;
Date: 2011;
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Keywords: Raphidophyte | noxious bloom | Chattonella marina | HABs | southwest coast of India.

ABSTRACT
A massive monospecific bloom of toxic marine raphidophyte Chattonella marina was observed off Kochi along the southwest coast of India during late September 2009 with very high cell density (1.59 x 107cells L-1) and wide spatial distribution. The tear drop shaped cells were 38-65 µm long, 25-30 µm wide and having large number of chloroplasts. Almost 90% of the phytoplankton population was composed of C. marina in the bloom area. Other phytoplankters were few in number represented by Skeletonema costatum,Rhizosolenia spp., Chaetoceros spp., Psuedo-nitzschia spp. etc. and among these Skeletonema costatum was dominant with cell density 2.3 x 104cells L-1. The concentration of photosynthetic pigment, chlorophyll a was 8.3 µg L-1in the bloom area. Toxicity test using the alcohol extracts of the Chattonellabloom samples showed characteristic neurotoxic symptoms in fishes leading to mortality.
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