List of Vulnerable and Endangered Starfish Species with Population Size :
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Sunflower Sea Star (Pycnopodia Helianthoides)
- Status: Critically Endangered (IUCN Red List).
- Population Count: Populations have declined by over 90% across much of their range. In some areas, they are locally extinct.
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Giant Sea Star (Pisaster Giganteus)
- Status: Vulnerable in certain regions.
- Population Count: Specific population numbers are not well-documented, but declines have been observed in areas affected by sea star wasting syndrome.
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Crown-of-Thorns Starfish (Acanthaster Planci)
- Status: Considered problematic in some areas, vulnerable in others due to varying population dynamics.
- Population Count: Population counts vary widely; they can be sparse in some areas but outbreak levels in others (e.g., outbreaks on the Great Barrier Reef).
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Ochre Sea Star (Pisaster Ochraceus)
- Status: Populations have declined in some areas due to sea star wasting syndrome, but not officially listed as endangered or vulnerable.
- Population Count: Significant declines have been observed, with some areas reporting up to 80-90% reduction in population.
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Northern Pacific Sea Star (Asterias Amurensis)
- Status: Invasive in some regions, but populations in native ranges are under threat.
- Population Count: No specific numbers available; invasive populations can reach high densities, while native populations face declines.
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Purple Sea Star (Pisaster Ochraceus)
- Status: Also affected by sea star wasting syndrome, leading to regional declines.
- Population Count: Similar to the Ochre Sea Star, with regional declines of up to 80-90% in some affected areas.
The conservation status of starfish can vary by region and specific threats. To get the most current and comprehensive information, checking the IUCN Red List or similar databases is recommended.