Study on the growth and production of carp polycuture system in beel Simulia and beel Baelai at Kaligonj,Gazipur / [MS Thesis] Fishes STU 338.372 Thesis(M.S.)-Department of Zoology, University of Dhaka, Session : 2001-2002 Dhaka : University Of Dhaka, 2006. 2006. 2006 Text vii, 64 p.[5]leaves of plate : eng