General Impact
Pomacea canalicualata was originally introduced from South America to south-east Asia around 1980, as a local food resource and as a potential gourmet export item. The markets never developed; the snails escaped or were released, and P. canaliculata became a serious pest of rice throughout many countries of south-east Asia. In the Philippines, it is considered the number one rice pest and has caused huge economic losses. It was introduced to Hawai‘i in 1989, probably from the Philippines, and for the same reasons as for its initial introduction to south-east Asia. Again, the snails rapidly escaped or were released and quickly became major taro pests. P. canaliculata can spread rapidly from agricultural areas into wetlands and other natural freshwater systems where it may have a serious impact. These potential impacts could involve destruction of native aquatic vegetation leading to serious habitat modification, as well as competitive interactions with the native aquatic fauna, including native snails. Already, introduced P. canaliculata has been implicated in the decline of native species of Pila apple snails in south-east Asia. Also, native species of Pila in the Philippines are reported to have declined as a result of extensive pesticide applications against introduced P. canaliculata. Climatic modeling has shown that it has the potential to spread to many as yet uninfested parts of the world, for instance the huge rice-growing areas of India. It has already been introduced to the USA and threatens the major rice-crops of Texas and California. Australia in particular is extremely concerned about its potential introduction to natural wetlands (e.g., Kakadu) as well as to rice-growing areas.
Location Specific Impacts:Cambodia 
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. China
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Dominican Republic
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Guam
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Hong Kong
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Java (Indonesia)
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Sumatra (Indonesia)
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Japan
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Korea, Republic of
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Lao People`s Democratic Republic
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Malaysia
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Sarawak (Malaysia)
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Papua New Guinea
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Philippines
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Singapore
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Sri Lanka
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Taiwan
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Thailand
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. California (United States (USA))
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Florida (USA) (United States (USA))
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Hawaii (United States (USA))
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Texas (United States (USA))
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation. Viet Nam (Vietnam)
Competition: Possibly competes with native freshwater snail species.
Herbivory: Voracious macrophyophagous herbivore. Feeds on many crops, probably also natural vegetation.
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