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Northern Pacific Seastar

Northern Pacific Sea Star Asterias amurensis . The northern Pacific sea star was thought to be introduced to Tasmania Via the ballast tank water from overseas cargo ships in 1986. At the time the sea star was incorrectly identified as a native species, It wasn't till 1992 that the star was correctly identified as a introduced species.The Sea stars primary food source is shell fish, but will happily eat anything in-which it can capture, making this introduced species capable of wiping out our 1142

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Northern Pacific Seastar

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    1. Northern Pacific Seastar Asterias amurensis

    2. Northern Pacific Sea Star Asterias amurensis The northern Pacific sea star was thought to be introduced to Tasmania Via the ballast tank water from overseas cargo ships in 1986. At the time the sea star was incorrectly identified as a native species, It wasnt till 1992 that the star was correctly identified as a introduced species. The Sea stars primary food source is shell fish, but will happily eat anything in-which it can capture, making this introduced species capable of wiping out our shellfish fisheries. The northern pacific sea star is capable of reproducing at 10cm in diameter & in one year can increase its diameter by 8cm. Spawning in Tasmania occurs during winter at temperatures of 10 to 12 degrees Celsius . A mature female may carry up to 20 million eggs.

    3. Northern Pacific Sea Star Asterias amurensis The northern Pacific sea star is a voracious predator and will eat almost any animal tissue it can capture. However, the sea star has a particular fondness for shellfish, whose flesh it eats after prising their shells open with its arms. This preference for shellfish poses a serious threat to mariculture and wild shellfish fisheries. The sea star is also capable of detecting food from some distance away and will dig shallow pits to extract buried prey.

    4. Northern Pacific SeaStar Asterias amurensis clean and anti-foul boat hulls regularly clean/wash shellfish and clean/dry aquaculture gear before transporting to a different lease report sightings of Asterias (sea star) to Fishcare or Marine Environment contact officer Form a group go diving & collect the seastars with spears then dispose of thoughtfully

    5. Northern Pacific Sea Star Asterias amurensis

    6. Other Introduced Marine Pests Giant Fanworm ((Sabella spallanzanii) Location; Devonport /Tasmania Damage; Strongly competes for natives food Japanese Seaweed (Undaria pinnatifida) Location; It was first detected in Australia in 1988 near Triabunna on the east coast of Tasmania. Over the following ten years it spread along 100 kms of the Tasmanian eastcoast and in 1998 was reported in the DEntrecasteaux Channel south of Hobart. Damage; highly invasive, rapid growth with the potential to overgrow and exclude native seaweed's. Though humans can consume this, natives choose not to.

    7. Bibliography http://crimp.marine.csiro.au/ http://www.ABC.net.au/science/slab/starfish/default.htm http://www.fish.wa.gov.au/hab/broc/marineinvader/marine01.html www.google.com CSIRO Enquiries 1300 363 400

    8. Which of These Is Not Like The Other???

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