Studies of planktonic Ostracoda collected from Arabian Sea and Bay of Bengal
1996
General distribution and numerical abundance of planktonic ostracods, as a
whole, in the Exclusive Economic Zone of India and nearby seas based on 1086
collections (1985-'88) are discussed. The average density of ostracods in the area
investigated was estimated to be 17395/1000 m . The ostracods occurred far more
abundantly in the shelf waters than in the oceanic areas. Samples collected indicated
that 95% of the ostracod population occurred off the west coast of India round the
year. They were found remarkably high (61168/1000 m\ 63.3%) between 10°N and
15°N off the west coast, while their abundance between 10°N and 15°N off the east
coast of India was the lowest (624/1000 m , 0.65%). The abundance of ostracods was
always associated with monsoon when the maximum of 31920/1000 m was obtained
and this was mainly due to the swarming nature of these organisms. The minimum
was observed during the premonsoon period when an average of 1508/1000 m
ostracods occurred. Comparison of ostracod distribution in the EEZ of India between
day and night yielded values of 30.95 and 69.05% respectively, which showed that
they are more abundant during night, thereby illustrating pronounced diurnal vertical
migration.
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