IMPACT OF HYDRO-ECOLOGY ON FISH MIGRATION IN SELECTED EAST COAST ESTUARIES
109
Authors
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UTPAL BHAUMIK
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N. P. SHRIVASTAVA
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B. B. SATPATHY
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M. K. MUKHOPADHYAY
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A. P. SHARMA
Abstract
Attempts were made to identify the commercially important migrant fish species and study their migration pattern in two selected estuaries i.e. Hooghly and Mahanadi on east-coast facing the Bay of Bengal Sea. Nearly 20 species in such category could be enlisted from Mahanadi estuary, which were also encountered in the Hooghly estuarine system. Most of the migrant species were amphidromous and their estuarine migration was influenced by the hydro-ecological characteristics. Salinity, depth and food niches were amongst the factors governing migration of the fishes. Migration was limited to 35 km in Mahanadi while up to 100 km in Hooghly estuarine system. Hilsa was only anadromous species migrating to freshwater river course and got struck up by the barrages. In Mahanadi river-estuarine system migration of Hilsa was seriously affected. Recruitment and fisheries of Hilsa in Hooghly-Bhagirathi system did not show significant impact of the Farakka barrage.
Key words : Hydro-ecology, migration, estuary, amphidromous
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