Adult Tilapia zillii are considered to be voracious herbivores, often decreasing plant density and changing the composition of native plants which can threaten many native aquatic organisms that depend on such plants for forage, protection, or spawning (GSMFC, 2005; Spataru, 1978).
Location Specific Impacts:
Economic/Livelihoods: Tilapia zillii has had a beneficial socio-economic impact on this location and has created a small recreational fishery (FishBase, 2008).
United States (USA)
Modification of natural benthic communities: Tilapia zillii often reduce the amount of vegetative cover in a body of water which is used for spawning or protection from predation of golden shiner, eastern mosquitofish and green sunfish (FishBase, 2008).
Alabama (United States (USA))
Arizona (United States (USA))
California (United States (USA))
Modification of natural benthic communities: Tilapia zillii have been linked to the decline in desert pupfish in the Salton sea (Costa-Pierce, 2003).
Florida (USA) (United States (USA))
Other: There was no recorded impact for this location, only a risk of modification of natural benthic communities (Taylor, 1986).
Hawaii (United States (USA))
Idaho (United States (USA))
Nevada (United States (USA))
North Carolina (United States (USA))
Modification of natural benthic communities: The introduction of Tilapia zillii into Hyco Reservoir, North Carolina resulted in the elimination of all aquatic macrophytes within 2 years after introduction, coinciding with declines in population of the golden shiner (Notemigonus crysoleucas), the eastern mosquitofish (Gambusia holbrooki), and the green sunfish (Lepomis cyanellus) (Crutchfield, 1995).
Texas (United States (USA))