Evaluation of Labeo Calbasu Fishery Status Using Surplus Production Models in Kaptai Reservoir, Bangladesh

Abstract

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.

Clupeids in the kaptai reservoir, a blessing or a curse: estimation of fisheries reference points

“…Carp production has reduced alarmingly in this system and recorded as 1.56% of total the catch (2018–2019). Overexploitation of Labeo calbasu was already evident by Khatun et al [ 19 ]. On the other hand, decreasing depth of water, heavy siltation, silt bed, overexploitation of high-value fishes, a fishing ban, prolific breeding success, fast growth rate and high survival rate of these clupeids causes the massive production of these dominant stocks.…”

“…There have been some works focusing on the limnological and biological aspects of the reservoir [ 20 , 21 ], biodiversity conservation [ 22 , 23 ]. Some studies have also been done on population dynamics[ 19 , 24 , 25 , 26 ]; and ecosystem functions [ 27 , 28 ]. Yet, no work has been done to estimate the biological reference points (BRPs) of these two fish stocks from the Kaptai reservoir.…”

Assessing Five Major Exploited Tuna Species in India (Eastern and Western Indian Ocean) Using the Monte Carlo Method (CMSY) and the Bayesian Schaefer Model (BSM)

“…Scientists and managers representing fisheries recognize principles of MSY, q, r and k for attaining sustainability in their respective fisheries [25,42,43]. In order to suggest biological reference points (BRPs) estimated by various statistical methods, scientists assess fishery stock status [44,45]. In this study, the biological reference points of five major tuna species have been estimated by two newly developed computerized methods: Monte Carlo Catch-MSY (CMSY) and the Bayesian Schaefer Model (BSM) for estimating the level of exploitation of five major tuna fishery stocks in the Eastern and Western Indian Ocean.…”

Evaluating the fishery of tropical reservoirs using surplus production models: A case study of Aliyar Reservoir, Tamil Nadu, India

“…Surplus production models consider only the changes in the exploitable biomass in a system, and derive the maximum sustainable yield (MSY) and the fishing effort at which it can be achieved. Surplus production models have been employed by many researchers to study the sustainable exploitation of stock in lakes and reservoirs in countries such as Bangladesh and Indonesia (Anna, 2018; Anna et al, 2017; Khatun et al, 2019; Singh, 2015) utilizing fish catch‐effort data. Economic evaluation of the resource use efficiency of the Aliyar fishery in the present study was performed by employing the Schaefer (1954) and Fox (1970) models and their variant provided by Clarke et al (1992) to fish catch‐effort data, and the MSY and the optimum effort required to achieve it were estimated.…”