Implementation Workshop summaryDepartment of the Environment and Heritage, May 2002 In 2000 Australian Government's agreed to the National Control Plan for the Introduced Marine Pest: Northern Pacific Seastar (Asterias amurensis). The sea stars are responsible for the endangerment of multiple organisms such as native shellfish and the spotted handfish. Northern Pacific Seastar Removal. July 25, 2010 by baykeeper. The Northern Pacific Seastars are known to have significant impact on native marine species, due to them being predators of a wide range of these native animals. The arms taper into pointed, upturned tips. Northern Pacific Seastar ( Asterias amurensis) Marine species not currently found in South Australia. They like cold temperatures between 7 and 10 degrees, although they have adapted to temperatures up to 22 degrees. The Northern Pacific seastar is highly invasive and capable of reaching high densities in invaded habitats. North Pacific Seastar population decline? Sea star, any marine invertebrate of the class Asteroidea (phylum Echinodermata) having rays, or arms, surrounding an indistinct central disk. Recent estimates indicate the population has increased to 12 million only after two years since they were first detected in Port Phillip Bay. Estimates made in Port Philip Bay (where they were first detected), indicate that numbers reached as much as 12 million individuals in two years. Introduction of A. amurensis and its population density The Northern Pacific seastar which is native to the coasts of northern China, Korea, Russia and Japan was first introduced to Australia (South Eastern Tasmania) in the early 1980s (5). (Uscian, 2006) Behavior. Despite their older common name, they are not fishes. The sea star is known to impact marine industries especially to commercial shellfish farming. Photo: Non-native to Australian waters, the Northern Pacific seastar, Asterias amurensis, is a pest that poses a serious threat to Western Australia’s aquatic environment. They cannot be held or traded in South Australia without specific authorisation and must not be returned to the water if caught. Not all the marine life residing in Port Phillip Bay is good for the environment and the Northern Pacific Seastar is a good example of how one species can do much to damage the native marine environment.. The average lifespan of a sea star is around 10 years, although many sea star species are able to live to about the age of 50. The ships suck in the ballast water containing seastar larvae in a port in Japan for example, and let it out in a port in Tasmania. There are some 2,000 species of sea star living in all the world’s oceans, from tropical habitats to the cold seafloor. Recent estimates indicate the population has increased to 12 million only after two years … Population. Agriculture Victoria Principal Officer Invasive Marine Species, Dr Richard Stafford-Bell, said the Northern Pacific seastar was first detected in Port Phillip Bay in 1995, and by 2000 a significant population of the seastar had established. Controlling the Northern Pacific Seastar (Asterias amurensis) in Australia (PDF - 711.57 KB) About the report The introduction of non-indigenous species can act as vectors for new diseases, alter ecosystem processes, reduce biodiversity (Vitousek et al. UCSC intertidal researchers have continued to monitor sea star populations along the US west coast this spring and summer. A. amurensis, is a benthic marine predator that has the potential to drastically alter native ecosystems and affect aquaculture industries [18,19]. Noxious species are a severe threat to the natural environment and industries. 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