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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 ]
Asterias is a genus of the Asteriidae family of sea stars.It includes several of the best-known species of sea stars, including the common starfish, Asterias rubens, and the northern Pacific seastar, Asterias amurensis.
Solaster dawsoni attacking a spiny red sea star, Hippasteria spinosa An adult specimen of Solaster dawsoni afflicted by the Sea star wasting disease off Vancouver. The morning sun star is a predator, feeding mostly on other starfish. It is feared by other stars which move away as fast as they can if touched by a morning sun star.
Because this sea star is a top-level predator, its disappearance had profound effects on the ecosystem. [20] In the Channel Islands off the coast of California, ten species of sea star were recorded as being affected as well as three species of sea urchins, two brittle stars and a sea cucumber, all of which experienced large population declines ...
Pisaster ochraceus, generally known as the purple sea star, ochre sea star, or ochre starfish, is a common seastar found among the waters of the Pacific Ocean. Identified as a keystone species , P. ochraceus is considered an important indicator for the health of the intertidal zone .
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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]