Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2000.677.678Platanista minor) Population Estimation]]>MaanM. Anwar A. Aleem Chaudhry 4200034During the study 129 dolphins were observed at 56 different sites with mean group size of 2.30. Total 199.2 dolphins were estimated from Chashma barrage to Guddu Barrage. 81.19% dolphin population had surfacing-interval 0-120 seconds, 16.83 percent 120-240 seconds. The dolphins were observed with probabilities p=1.0, p=0.26 and p=0.21 respectively. Sighting distance and surfacing-intervals were important parameters in dolphin population estimation. With increase in sighting distance and surfacing-interval, the probability of visibility of dolphins on surface of water decreases and chances of missing dolphins from observations are increased.]]>Anderson, J.,1879Planista and Orcella.]]>pp: 550pp: 550Chaudhry, A.A. and S.A. Chaudhry,19888209214Chaudhry, A.A. and U. Khalid,19899291296Niazi, M.S.,19851985Niazi, M.S.,19861986Niazi, M.S. and M.M. Azam,198811111114Pilleri, G.,19801980Recovita, E.,19641964Reeves, R.R. and S. Leatherwood,1994pp: 92pp: 92Roberts, T.J.,1977pp: 361pp: 361