Aliens to Hawaiian Streams

Much of the water life in Hawaiian streams are alien. The aliens in the above aquarium are commonly found in places such as Manoa Stream.

Tilapia: Introduced in 1951 as bait and aquatic weed control, major reason for decline of Hawaiian waterbirds.
Armored Catfish: From South America, a released pet fish, eats algae, may have developed a taste for native 'o'opu eggs.
Western Mosquitofish: A deadly introduction, brought here to control mosquitoes in 1905, caused the decline of native fishes and native damselflies in low, wet areas of O‘ahu.
Guppy: Introduced in 1922 to control mosquitoes, harmful to native stream fish and insects.
Shortfin Molly: Present here before 1950, released aquarium pet. largest of the introduced live-bearing fish, carries several parasites that harm 'o'opu.
Atyid Shrimp: On O‘ahu since 1991, released aquarium pet.
Crayfish: Introduced as a potential food resource, seriously damages walls of taro patches, the cause for the poisoning of 3,500 acres of land taro between 1940-1952.
Tahitian Prawn: Native of Tahiti and Guam, thought to have harmed many native stream animals, can cause serious illness if eaten raw.