Exotic fish species or non-indigenous fish have become common in different parts of the world due to their use in aquaculture, improvement of local fisheries potential, recreation and sports, ornamental and hobby fisheries, as well as pest control. I ndiscriminate transfer of fish species has been generating worldwide concerns.
Exotic species, despite possessing some attractive characteristics may introduce unhealthy competitions for food and habitat, prey on fish, introduce new diseases and parasites, or hybridize in the new environment. This study considers the ecological significance and risks the introduction of exotic species may pose to aquatic biodiversity as well as the ecosystem.