Exotic fish species in a global biodiversity hotspot: observations from River Chalakudy, part of Western Ghats, Kerala, India

By R. Raghavan, G. Prasad, P. H. Anvar-Ali, Benno Pereira. Biological Invasions, 2007

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Fish and fisheries in the Upper Mekong: current assessment of the fish community, threats and conservation (2009, background): “Exotic species can compete with native fishes for food, space and other resources, leading to greatly reduced numbers of local species, and even the local extinction of some species (Welcomme and Vidthayanom 2003; Raghavan et al. 2008; Dudgeon and Smith 2006).”
Biodiversity, ecohydrology, threat status and conservation priority of the freshwater fishes of river Gomti, a tributary of river Ganga (India) (2010, background): “Raghavan et al. (2008b) recorded a temporal partitioning with regard to species richness with higher during the day time.”
Risk and benefit assessment of alien fish species of the aquaculture and aquarium trade into India (2011, background): “Four popular species of aquarium pets, guppy (Poecilia reticulata), three-spot gourami (Trichogaster trichopterus), platy (Xiphophorus maculatus) and sucker catfish (Pterygoplichthys multiradiatus), were found in the inland waters of Kerala State, a biodiversity hot-spot region of the country (Ragha”