Record of non-native loricariid catfish, Pterygoplichthys disjunctivus (Weber, 1991) (Siluriformes, Loricariidae) in Kadamba tank - Tamiraparani river basin, Tamilnadu, India.
Freshwater lakes are significant not only for human populations but also essential for plant and animal diversity. These aquatic systems are unique and are rich in biodiversity at the same time are under constant threat due to bludgeoning human populations and their demand for land. The impact of the anthropogenic activities in freshwater lake viz., habitat degradation, exotic species introduction, water diversions, pollution and global climate change are the main causative agents for the rapid decline of aquatic species. Globally aquatic ecosystems are affected due to increase in unwise anthropogenic activities (Basavaraja et al, 2014). The introduction of non-resident or alien fish species into local aquatic systems and the consequent invasion and establishment by the introduced species can cause threats to endemic fishes and native fish fauna. Consequences of similar disturbances to native fish populations have already been witnessed worldwide (Balon, 1992). The present investigation was carried out in Kadamba Tank, Thoothukudi District, to assess the seasonal variations in water quality parameters, in relation of species diversity of the Kadamba tank. Among 61 species recorded during the 12 month study, Tilapia, African cat fish and Armoured sucker cat fish were the exotic species recorded. The presence of Armoured sucker cat fish indicates accidently introduction from aquarists and is among the latest exotic species introduced in Kadamba tank.