Fish production and diversity in Alua Beel and Mokash Beel in Kaliakoir Upazilla under Gzipur District / [MS Thesis] Fish culture 639.3 FIS Thesis (MS) -- Department of Zoology, University of Dhaka, Session : 2001-2002 Includes bibliographical references Dhaka : University of Dhaka, 2006. 2006. 2006 Text x, 100p. : eng