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Mangrove
whipray
Himantura walga
Family Dasyatidae
updated
Sep 2020
Where
seen? This
plain stingray with a sharp pointed snout is sometimes seen on our
Northern shores, usually on muddy shores. It is more active at night
and at high tide. Small ones are sometimes also seen trapped in pools
in the seagrass meadows at low tide.
Features: Grows to about 25cm in diameter, those seen
about 15-20cm. Body generally oval with a pointed snout. Body colour
plain beige or pinkish without any markings. Tail long and whip-like
without markings. It does not have a skin fold on the tail. The female
has a shorter tail with a bulbous end. It has 4-6 enlarged spear-like
spines on the tail which can cause a painful wound by injecting a
venom.
Sometimes mistaken for a horseshoe
crab and visa versa. In murky waters, these two different animals
do have a similar profile, both being round and flat with a long tail.
But the horseshoe crab moves very differently- creeping slowly, while the stingray can dash away quickly. |
This one seems to have a broken tail.
Pulau Sekudu, Apr 09 |
Small one.
Chek Jawa, May 03 |
Underside.
Pulau Sekudu, May 04 |
Blue-spotted stingrays and Mangrove whiprays
in a sandy lagoon.
Pulau Sekudu, Apr 06 |
Often seen trapped in fishing nets.
Changi, Jul 11
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Human uses: It is harvested commercially
as a food fish. According to FishBase:
It is caught in large quantities as by-catch of bottom trawl and trammel
net fisheries. It is often seen among the fishes trapped in abandoned fishing nets and traps on our shores. |
Mangrove
whiprays on Singapore shores |
Other sightings on Singapore shores |
Coney Island, Nov 20
Photo shared by Richard Kuah on facebook. |
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Beting Bronok, May 09
Photo shared by Marcus Ng on flickr. |
Pasir Ris-Loyang, Oct 20
Photo shared by Loh Kok Sheng on facebook. |
Pulau Hantu, Aug 15
Photo shared by Marcus Ng on flickr.
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Links
References
- Marcus F. C. Ng. 18 September 2015. Juvenile mangrove whip-ray at Pulau Hantu. Singapore Biodiversity Records 2015: 128.
- Lim, S.,
P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life
and Times of Labrador Beach. Division of Biology, School of
Science, Nanyang Technological University & Department of Zoology,
the National University of Singapore. 160 pp.
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