History of oceanography: origin and development Classes of Toxic Chemicals and Their Effects Origin and developmental history of oceanography Sustainable Livelihood Approach Effects and control of aquatic vascular plants Human Resource Management First record of invasive croaking gourami, Trichopsis vittata (Cuvier 1831) in South-eastern Bangladesh Distribution and Taxonomic Study of a Newly Recorded Croaking Gourami, Trichopsis vittata (Cuvier, 1831) in Bangladesh 
