Sciences marines : recherche et développement

Abstrait

STUDY ON BIO DIVERSITY OF SHELLFISH IN MANAPAD ESTUARY

T. Selva Mohan B.Durga Elavarasi T. Arivukkarasi, R.Uma Maheswari

   Some physical-chemical parameters like water temperature, pH, suspended solid, salinity, dissolved oxygen, NO₂^-, NO₃^-, NH₃, and PO³₄^-were  investigated at the mannapad estury underr varying tidal conditions during monsoon, postmonsoon and premonsoon. The pH  and salinity increased during monsoon season.  Concentrations of DO, inorganic PO^3-4 and NO^-₂ increased during ebb regime and a increased  trend was observed starting from monsoon to premonsoon which indicate high indicates high productivity towards the confluence with Bay.NO^-₃ is increased in the after monsoon season.  Higher values of ammonia during premonsoon particularly during low tides may be attributed to the discharge of untreated domestic sewage and industrial effluents to the estuary. Shellfish were collected in many species