The geographic range of (BBC, 2005)is the Western Pacific ocean around Japan.
- Range depth
- 200 to 400 m
- 656.17 to 1312.34 ft
- Average length
- 7.62 cm
- 3.00 in
Fertilized eggs hatch in 6-14 days depending on the water temperature, which varies from six to 16 degrees Celsius. Higher temperatures encourage quicker hatching.
At 15 degrees Celsius, one hour after fertilization, polar bodies appear, followed in five hours with first cleaveage. By 10 hours, 100 or more cells have been formed, and around 16 hours the embryonic lobe has been developed. The embryonic lobe covers about half of the egg in a day and a half. In four days, primordial eyes are present and oral depression starts. A day later, primordial arms, mantle, and funnel appear and then chromatophores appear on the mantle and the eyes are developed. Final organ and chromatophore formation and hatching occurs in 8-8.5 days. (Tsuchiya, 2007)
- Development - Life Cycle
Bioluminescent photophores can attract mates and be used for communication with other squids. (BBC, 2005)
The spawning season runs from March to May. During this time, firefly squids can be seen gathering in large numbers to lay their eggs. Once the eggs have been released into the water and fertilized, the adult squid die. This completes the one-year life cycle of the squid. ("Firefly Squid", 2010)
- Breeding interval
- Once yearly
- Breeding season
- March - May
- Average age at sexual or reproductive maturity (female)
- 1 years
- Average age at sexual or reproductive maturity (male)
- 1 years
Adult firefly squids die after eggs have been released into the water and fertilized. ("Firefly Squid", 2010)
- Parental Investment
- no parental involvement
The firefly squid lives for about one year. (BBC, 2005)
- Key Behaviors
Communication and Perception
The photophores along the body and tentacles of the (BBC, 2005)are used to attract prey, provide camouflage, frighten predators, and to attract a mate. The firefly squid also has highly developed vision. Its eyes contain three different types of light-sensitive cells and are believed to be capable of distinguishing different colors.
- Communication Channels
- Other Communication Modes
- Perception Channels
- Animal Foods
- aquatic crustaceans
- other marine invertebrates
The photophores along the body of the squid can be used against predators in either a warning form or as counter-illumination camouflage. The northern fur seal, Callorhinus ursinus, is a known predator. (BBC, 2005; Mori, et al., 2001)
- Known Predators
- Northern fur seal, Callorhinus ursinus
Economic Importance for Humans: Positive
Economic Importance for Humans: Negative
- Negative Impacts
- injures humans
is not protected under any conservation program.
Krupa Patel (author), Rutgers University, Dorothy Pee (author), Rutgers University, David V. Howe (editor), Rutgers University, Renee Mulcrone (editor), Special Projects.
- Pacific Ocean
body of water between the southern ocean (above 60 degrees south latitude), Australia, Asia, and the western hemisphere. This is the world's largest ocean, covering about 28% of the world's surface.
having coloration that serves a protective function for the animal, usually used to refer to animals with colors that warn predators of their toxicity. For example: animals with bright red or yellow coloration are often toxic or distasteful.
- bilateral symmetry
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
an animal that mainly eats meat
- causes disease in humans
an animal which directly causes disease in humans. For example, diseases caused by infection of filarial nematodes (elephantiasis and river blindness).
having markings, coloration, shapes, or other features that cause an animal to be camouflaged in its natural environment; being difficult to see or otherwise detect.
humans benefit economically by promoting tourism that focuses on the appreciation of natural areas or animals. Ecotourism implies that there are existing programs that profit from the appreciation of natural areas or animals.
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
A substance that provides both nutrients and energy to a living thing.
having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.
A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.
having the capacity to move from one place to another.
- native range
the area in which the animal is naturally found, the region in which it is endemic.
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
generates and uses light to communicate
an animal that mainly eats fish
- saltwater or marine
mainly lives in oceans, seas, or other bodies of salt water.
- seasonal breeding
breeding is confined to a particular season
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
uses sight to communicate
animal constituent of plankton; mainly small crustaceans and fish larvae. (Compare to phytoplankton.)
Sea and Sky. 2010. "Firefly Squid" (On-line). Deep sea creatures. Accessed June 20, 2011 at http://www.seasky.org/deep-sea/firefly-squid.html.
Toyama Prefectural Tourism Association. 2009. "Travel Guide Toyama" (On-line). Accessed June 21, 2011 at http://www.info-toyama.com/english/guide/index.html.
Animal Planet, 2011. "Squid" (On-line). Animal Planet. Accessed June 19, 2011 at http://animal.discovery.com/invertebrates/squid/.
Aoyama, S., Y. Hinoue, H. Takahashi, Y. Yoshimitsu, Y. Kusajima, T. Hirono, N. Takayanagi, N. Akao, K. Kondou. 1996. Clinical study of ten cases with acute abdomen after eating raw firefly squid (Watasenia scintillans, Hotaruika), which are probably due to type X larvae of the suborder spirurina. Nippon Shokakibyo Gakkai Zasshi, 93: 312-321.
BBC, 2005. "Animal fact files: firefly squid" (On-line). Accessed June 19, 2011 at http://www.bbc.co.uk/nature/blueplanet/factfiles/molluscs/firefly_squid_bg.shtml.
Dahlgren, U. 1922. Phosphorescent plants and animals. Natural History, 22: 19.
Hayashi, S., K. Hirakawa. 1997. Diet composition of the firefly squid, Watasenia scintillans, from Toyama Bay, Southern Japan Sea. Bulletin of the Japan Sea National Fisheries Research Institute, 47: 57-66.
Hooper, R. 2003. "The Japan Times Online" (On-line). Accessed June 20, 2011 at http://search.japantimes.co.jp/cgi-bin/fe20030911at.html.
Mori, J., T. Kubodera, N. Baba. 2001. Squid in the diet of northern fur seals, Callorhinus ursinus, caught in the western and central North Pacific Ocean. Fisheries Research, 52: 91-97.
Shimomura, O. 2006. Bioluminescence: Chemical Principles and Methods. Singapore: World Scientific Publishing Co. Pte. Ltd..
Smyth, J. 1994. Introduction to Animal Parasitology. Cambridge: Cambridge University Press.
Tsuchiya, K. 2007. "Watasenia scintillans" (On-line). Accessed June 20, 2011 at http://tolweb.org/Watasenia_scintillans/19645.