Chaetognaths from three different environments

V.R. Nair

Abstract



A comparative account on the chaetognaths in the Arabian Sea, Laccadive atolls and Cochin backwaters is given. The upper 200 m of the Arabian Sea sustains nineteen species and the species composition indicates the homogeneity of the Indo-Pacific fauna. Most of the species were abundant near Somalian and Arabian coasts. Population maxima of chaetognaths were found not adjacent to the centre of upwelling but shifted to the fringe of the enriched area. Fourteen species were found in and around the Laccadive atolls and their density was considerably reduced inside the lagoon. The Cochin backwaters presents a distinct ecosystem and the fauna is constituted of relatively few species. There is no permanent chaetognath population in this estuary. Here the maintenance of population is dependent on recruitment of individuals from the sea and it occurs during the post monsoon period

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