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Asterias amurensis, also known as the Northern Pacific seastar and Japanese common starfish, is a seastar found in shallow seas and estuaries, native to the coasts of northern China, Korea, far eastern Russia, Japan, Alaska, the Aleutian Islands and British Columbia in Canada.
The Northern Pacific seastar is considered a serious pest of native marine organisms in Australia, and is a major factor in the decline of the critically endangered spotted handfish. It preys on the handfish eggs, and/or on the sea squirts (ascidians) [ 1 ] that help to form the substrate that the fish spawn on. [ 2 ]
Image Scientific name Distribution Asterias amurensis Lütken, 1871: northern Pacific seastar: northern Pacific in northern China, South Korea, North Korea, Japan, Far East Russia, Alaska and Canada (British Columbia) Asterias argonauta Djakonov, 1950: Primorsky Krai (Peter the Great Gulf), South Korea Asterias forbesi (Desor, 1848)
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In a study comparing seastar righting behavior the Henricia leviuscula twisted arms 1 and 3 toward each other, used arms 4 and 5 to support itself on the bottom of the tank, and moved arm 2 up so it was in a sitting-like position, and began to flip itself over. Overall, it had an average righting time of 15.22 minutes.
The most urgent matter concerning the survival of the species is to address the threat posed by the presence of an introduced species of seastar, the Northern Pacific seastar (Asterias amurensis), which prey on not only the fish eggs, [15] [16] but also on the sea squirts [17] that help to form the substrate that the fish spawn on. [18]
There are also marine and intertidal pest species present at the coastal park. The sabellid fan worm (Sabella spallanzanii) and the northern Pacific sea star (Asterias amurensis) both reside along the western shoreline of Port Phillip Bay and are very successful at spreading and out-competing native species. [2]
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