Common name: Northern Pacific Seastar

General Information

The Northern Pacific Seastar, scientifically known as Asterias amurensis, is a species of starfish native to the coastal waters of the northern Pacific region. This species is recognized for its striking appearance and its role as an invasive species in various parts of the world. With its distinctive five arms and vibrant coloration, it has become a subject of interest not only for marine biologists but also for aquarium hobbyists who are intrigued by its biology and impact on local ecosystems.

In its native habitat, Asterias amurensis plays a significant role in the marine ecosystem, but its introduction to non-native areas has raised concerns due to its voracious feeding habits and ability to outcompete native species. This has made it a species of interest in terms of both ecological study and management.

Care

While the Northern Pacific Seastar is not commonly kept in home aquariums due to its invasive nature and ecological impact, those who do choose to keep them must provide an environment that mimics their natural habitat. This includes a large tank with plenty of live rock and a sandy substrate. The tank should be well-filtered and maintained with stable water conditions.

Diet and Feeding

Asterias amurensis is a carnivorous species, primarily feeding on bivalves, crustaceans, and other small marine organisms. In captivity, they can be fed a diet consisting of chopped seafood, shrimp, and other meaty foods. It's important to ensure that their diet is varied to meet their nutritional needs.

Behavior and Compatibility

The Northern Pacific Seastar is generally peaceful but can be predatory towards small invertebrates and other slow-moving tank inhabitants. They are not suitable for reef tanks as they may consume corals and other sessile organisms.

Health and Common Issues

These seastars are relatively hardy but require stable water conditions to thrive. They can be susceptible to changes in water quality, which can lead to stress and health issues. Regular monitoring of water parameters is essential.

Habitat

Asterias amurensis is naturally found in the cold coastal waters of the northern Pacific, particularly around Japan, Korea, and Russia. They inhabit a range of environments from rocky shores to sandy substrates and can be found at various depths.

Conservation Status

Currently, Asterias amurensis is not listed as a threatened species on the IUCN Red List. However, their invasive status in non-native regions has prompted management efforts to control their populations and mitigate their impact on local ecosystems.