Surplus-production models were used for estimating the sustainable exploitation of Labeo calbasu fish stock in Kaptai reservoir, Bangladesh. The annual catch and effort data of 14 years (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014) were analyzed to estimate the Maximum Sustainable Yield (MSY) using software packages CEDA and ASPIC. The average production was found 156 mt while the topmost and undermost catch was 263 mt (in 2009) and 108 mt (in 2003) respectively MSY and CV of Fox model for normal, log normal and gamma assumption were 87 mt (0.339), 65 mt (0.464) and 67 mt (0.551) respectively whereas values from Schaefer model were 139 mt (0.055), 130 mt (0.055) and 137 mt (0.064) and 139 mt (0.059), 130 mt (0.056) and 137 mt (0.064) in Pella-Tomlinson models. As regards, ASPIC estimated MSY and CV values for Fox and Logistic models were 127 mt (0.054) and 133 mt (0.057) respectively. Higher R2 values (above 0.879) in ASPIC in contrast with CEDA (0.71-0.818) represent its better fitting to data. To be conservative, we choose the MSY of 80-100 mt which indicates overexploited condition of L. calbasu in Kaptai reservoir and actions should be taken for sustainable management.

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