Watasenia scintillans

Sparkling enope squid
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Teuthida
Family: Enoploteuthidae
Genus: Watasenia
Ishikawa, 1914
Species: W. scintillans
Binomial name
Watasenia scintillans
(Berry, 1911)

Watasenia scintillans, also known as the sparkling enope squid or firefly squid, is a species of squid in the family Enoploteuthidae. It is the sole species in the genus Watasenia.

Bioluminescence

Further information: Bioluminescence and Counterillumination

The sparkling enope squid is found in the Western Pacific ocean at depths of 183 to 366 metres (600–1200 feet) and is bioluminescent. Each tentacle has a photophore organ, which produces light. When flashed, the light attracts small fish, which the squid can feed upon.

This squid has three visual pigments located in different parts of the retina which likely allows color discrimination, each having distinct spectral sensitivities.[2]

The sparkling enope squid measures about 3 inches (7.6 cm) long at maturity and dies after one year of life. It has the standard eight arms and two tentacles, with one pair each having three, bright light-emitting organs at the tips.

Principle of the squid's counterillumination camouflage. When seen from below by a predator, the bioluminescence helps to match the squid's brightness and colour to the sea surface above.

The squid spends the day at depths of several hundred metres, returning to the surface when night falls. It uses its ability to sense and to produce light for counterillumination camouflage: it matches the brightness and colour of its underside to the light coming from the surface, making it difficult for predators to detect it from below.

Mating

The firefly squid can also light up its whole body to attract a mate. The mating season lasts from March to June.

Commercial use

This squid is commercially fished in Japan, accounting for an annual catch of 4,804 to 6,822 tons from 1990 to 1999. [3]

See also

References

  1. ↑ Barratt, I. & Allcock, L. (2010). "Watasenia scintillans". IUCN Red List of Threatened Species. Version 2014.3. International Union for Conservation of Nature. Retrieved March 7, 2015.
  2. ↑ "Map of Life - 'Colour vision' in Firefly squid". Convergent Evolution Online. University of Cambridge. Retrieved 6 November 2012.
  3. ↑ Tsuchiya, Kotaro. 2007. Watasenia Ishikawa 1914. Watasenia scintillans. Version 16 June 2007 (under construction). http://tolweb.org/Watasenia_scintillans/19645/2007.06.16 in The Tree of Life Web Project, http://tolweb.org/

External links

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