Non-linear statistical models on estimation of maximum size of Tor putitora(Hamilton) in different aquatic environments

Abstract

Tor putitora is one of the most important coldwater fish species. The population of this fish species has declined sharply in the recent past and is threatened with multifaceted dangers. As the size of fish plays an important role in fish stock assessment, in the present investigation, an attempt has been made to estimate the maximum size of Tor putitora in different aquatic environments by using nonlinear statistical models. We can expect a maximum length of approximately 3097 mm and 2994 mm for Tor putitora in the aquatic environments of Kumaun lakes and Gobindsagar reservoir respectively. It is seen that the estimated maximum size of Tor putitora in both environments are well acceptable in view of the reported maximum sizes in India and abroad