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This seastar is an invasive species in Australia. [19] It has colonised Australian waters in the Derwent Estuary, Port Phillip Bay and Henderson Lagoon in Tasmania. [2] [12] In the Derwent Estuary, the Northern Pacific seastar has been connected to the decline of the endemic endangered spotted handfish. [20] [21] [22]
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) northwest Atlantic, from Labrador south to the Caribbean Sea and Gulf of Mexico
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]
Starfish, such as the ochre sea star (Pisaster ochraceus) and the reef sea star (Stichaster australis), have become widely known as examples of the keystone species concept in ecology. The tropical crown-of-thorns starfish ( Acanthaster planci ) is a voracious predator of coral throughout the Indo-Pacific region, and the Northern Pacific ...
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.
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 .
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]
The orange sun star is found in the northern Pacific Ocean, its range extending from Japan and the Bering Sea and along the North American coast as far south as California. With a depth range of between 11 and 3,740 metres (36 and 12,270 ft), it occurs at greater depths than any other starfish in the north west Pacific.