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Real Starfish (Flatbottom Seastar - Asterias amurensis) specimen encased in square indestructible,transparentlucite block. Safe,authentic and completely unbreakable specimen put real starfish right at your fingertips! Anyone can safely explore the starfish from every angle. It is clear enough for microscope observation.
Length of the starfish is 6.5 cm (2.6 inch).
Size of thelucite block is 7.6x7.6x2.5 cm (3x3x1 inch).
Each one comes with a cardboard box for easy storage. Weight of thelucite block is 190 g and 220 g with packing box.
It is an ideal learning aid for students and kids and also a very good collectible item for every body.
is a handmade real animal specimen craft. Each one will be a bit different (specimen size, color and posture) even in the same production batch.
The picture in my listing is just for reference as we are selling multiple pieces with the same picture.
*** Wholesale is welcome.
I have a lot more specimenitems in my you may log in my store to select.
Free shipping cost.
Goods will be sent by
airmail from Hong Kong and it may take 12-18 days to arrive.
I can do combined shipping
if buyer also buys other items in my store.
Flatbottom Seastar - Asterias amurensis
Taxonomic name: Asterias
Common names: Flatbottom seastar, Japanese Seastar, Japanese starfish,
Nordpazifischer Seestern (German), North Pacific seastar, northern Pacific
seastar, purple-orange seastar
Organism type: sea star
Originally found in far
north Pacific waters and areas surrounding Japan, Russia, North China, and
Korea, the northern Pacific seastar (Asterias amurensis) has successfully
invaded the southern coasts of Australia and has the potential to move as far
north as Sydney. The seastar will eat a wide range of prey and has the
potential for ecological and economic harm in its introduced range. Because the
seastar is well established and abundantly widespread, eradication is almost
impossible. However, prevention and control measures are being implemented to
stop the species from establishing in new waters.
Asterias amurensis (northern Pacific seastar) can grow upto 50 cm in
diameter. It is yellow with red and purple pigmentation on its five arms, and a
small central disk. Its distinctive characteristic is its upturned tips which
are its identification key when compared to similar starfish. The undersides
are completely yellow and arms are unevenly covered with small, jagged-edged
spines. These spines line the groove in which the tube feet lie, and join up at
the mouth in a fan-like shape.
Pisaster brevispinus, Pisaster giganteus, Pisaster ochraceus
estuarine habitats, marine habitats
While Asterias amurensis (northern Pacific seastar) prefers waters
temperatures of 7-10°C, it has adapted to warmer Australian waters of 22°C. It
is typically found in shallow waters of protected coasts and is not found on
reefs or in areas with high wave action. The starfish is capable of tolerating
many temperatures and wide ranges of salinities. It is often found in estuaries
and on mud, sand or rocky sheltered areas of intertidal zones. The maximum
temperature for Asterias amurensis is 25°C and the minimum is 0°C. The
salinity range for this species is between 18.7 and 41ppt, while the maximum
depth at which individuals have been found is 220m.
Asterias amurensis (northern Pacific seastar) has the potential to
establish large populations in new areas. Estimates made in Port Philip Bay
(where they were first detected), indicate that numbers reached as much as 12
million individuals in two years. In their native range they are known to go
through 'bust and boom' cycles reaching high abundance and then rapid decline.
The northern Pacific seastar is a voracious feeder, preferring mussels,
scallops and clams. It will eat almost anything it can find, including dead
fish and fish waste. The seastar is considered a serious pest of native marine
organisms. The seastar is also considered a mariculture pest, settling on
scallop longlines, spat bags, mussel and oyster lines and salmon cages.
In Japan seastar outbreaks cost the mariculture industry millions of
No valuable human use has been documented. Hunting incentives have been
suggested, such as catching and drying as souvenirs.
In its native Japan, Solaster paxillatus (a sunstar) has been noted as a
predator of Asterias amurensis (northern Pacific seastar). The predation
of A. amurensis by king crabs in Alaskan aquaria has also been observed.
The size of prey eaten by A. amurensis usually equals the length of the
seastar's arm. Organisms that compete with A. amurensis include: Uniophora
granifera, Coscinasterias muricata and Odobenus rosmarus
divergens (Pacific walruses).
Native range: Native to Japan, North China, Korea, Russia, and far North
Introduction pathways to
Live food trade: Asterias amurensis (northern Pacific seastar)
can be transmitted via seawater in live fish trade
Ship ballast water: Asterias amurensis (northern Pacific seastar)
larvae can be distributed through ballast water
Ship/boat hull fouling: Asterias amurensis (northern Pacific
seastar) can be distributed on ship hulls
Translocation of machinery/equipment: Asterias amurensis
(northern Pacific seastar) can be unintentionally transferred via
Transportation of habitat material: Asterias amurensis (northern
Pacific seastar) settles on scallop longlines, spat bags, mussel and oyster
lines, and salmon cages.
Local dispersal methods
Water currents: Asterias amurensis (northern Pacific seastar)
larvae are transported in water currents.
Asterias amurensis is identified as one of the ten most damaging
potential domestic target species, based on overall impact potential (economic
and environmental). A hazard ranking of potential domestic target species based
on invasion potential from infected to uninfected bioregions identifies Asterias
amurensis as a 'medium priority species' - these species have a reasonably
high impact/or invasion potential.
Asterias amurensis (northern Pacific seastar) eats bivalves, gastropod
molluscs, barnacles, crabs, crustaceans, worms, echinoderms, ascidians, sea
urchins, sea squirts and other seastars, including conspecifics if food source
Asterias amurensis (northern Pacific seastar) reproduces sexually and
asexually. Spawning occurs between July and October in Australian waters . The
female seastar is capable of carrying up to 20 million eggs. Fertilisation is
external and larvae remains in a planktonic stage for up to 120 days before
settling and metamorphosing into juvenile starfish. Sperm half life at 10°C
> 2 hours, at 17°C < 30 minutes.
Juvenile Asterias amurensis (northern Pacific seastars) grow up to 6mm
per month in the first year and continue to grow 1 - 2mm per month until
maturity. The female is able to reproduce at about 12 months of age, when they
are around 10cm in diameter.
This species has been nominated as among 100 of the
"World's Worst" invaders. ***