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Firefly squid

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404:. Firefly squid possess three types of photophores. There are multiple (800-1000) small photophores covering the ventral surface of its body, five larger photophores around the lower margins of each eye, and three very large photophores at the tip of each of the fourth pair of arms. The photophores that dot the body of the squid produce two different wavelengths of light (both blue and green bioluminescence) while those around the eye and on the arms only produce blue light. The reactant luciferin and the necessary enzyme luciferase are located in a crystalline structure within rod-like bodies in their photophores. Firefly squid are the only cephalopods to have this structural arrangement which increases the efficiency of its bioluminescence and allows the light to be directed downward in a cone-like projection. This directed cone of bioluminescence is hypothesized to allow the Firefly squid to better detect its prey and predators from below and attract small fish to eat. The photophores on the tips of its fourth arm pair produce a very intense light that can be seen by the naked eye. 528:
Toyama Bay each spring during their mating season. For example, females store sperm for long periods in bilateral pouches under the neck collar, and are capable of egg spawning after the breeding season when males are no longer present. Males show specific sperm production and release patterning to augment their reproductive success. One proposed explanation for this unusual behavior is that although the males reach sexual maturity prior to the breeding season, females do not reach full maturity until later in the season. As a result of the shorter life-span of males, most males are only able to copulate once and are largely gone by the time that females are able to use the sperm stored during copulation. Once the squid's eggs have been fertilized and laid, it dies, having reached the end of its one-year lifespan. Spawning, which involves large aggregations of the squid, takes place between February and July.
656: 358: 540:, during the estimated mating period (EMP) of mid-February to mid-March to test the firefly squid monogamy hypothesis. Researchers found that mated females stored an equivalent amount of sperm in both pouches surrounding their seminal receptacles. They also observed a gradual decrease in the quantity of sperm during the reproductive season. This data indicates the preservation of sperm through the lifespan of the female firefly squid. Researchers found that 95% of females tested stored sperm from a single male. Further data collection confirmed that a single male's sperm fertilized all of the female's eggs. Both of these findings support monogamous reproduction of 671: 626: 614: 715: 727: 557: 688: 544:. To test monogamy in male firefly squids, researchers measured the maturity and fecundity of individuals. Data show that average male sperm levels would allow for no more than 2-3 copulations. The evidence for a low sperm production capacity and limited mating opportunities for males based on biased operational sex ratio and a lack of female remating supports the monogamy hypothesis in males. Female monandry was established first and subsequently males followed suit to create mutual monogamy in 641: 75: 460: 703: 50: 31: 441:: 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. As a participant in diel vertical migration, firefly squid primarily feed during the night. This feeding strategy is reflected in the squid's gut anatomy, which has a longer cecum that allows it to absorb nutrients during the day when its metabolic rate is lower. 514:(LSA). Cone cells of the vertebrate retina are clustered in the same retinal location and use multifocal lenses to refract the wavelengths to activate the specific photoreceptor cells. Firefly squid do not have multifocal lenses, but use a banked retina –specific photoreceptive cells are located at different distances from the lens – to compensate for LSA. 417:. For this reason, they also experience a significant change in environmental temperatures throughout the course of a day(3–6 °C or 37–43 °F during the day and 5–15 °C or 41–59 °F during the night). The firefly squid is especially well known for its yearly migration to the coastal waters of 505:
active pigments have only been found in the eyes of other organisms capable of color discrimination. The three pigments found include retinal (A1) with maximal absorption at 482 nm, hydroxyretinal (A4) with maximal absorption at 470 nm, and dehydroretinal (A2) with maximal absorption at 500 nm.
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and then die shortly thereafter. This mass migration of firefly squid to the shore is a lucrative business for Japanese fishermen, and during spawning season many go out to the bays to collect the dying squid. Many more also visit Japan during spawning season to see the bright blue light created from
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The firefly squid inhabits the waters off the coast of Japan. The depth at which these squids can be found varies (300–400 m or 1,000–1,300 ft during the day, and 20–60 m or 70–200 ft during the night) over the course of a day, as they are one of the several species of squid that
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are blue, green, and yellow. These shorter wavelengths have more energy and can penetrate deeper into the water column. The squid's visual system is adapted to capture the greatest amount of light at these depths. Each eye has a large pupil to allow more ambient light to enter the eye, no cornea to
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Chemical and structural analysis of the firefly squid retina reveal the presence of three visually active pigments located in distinct regions of the squid's retina. This is unique among cephalopods and may allow these squid to have color discrimination vision. The presence of two or more visually
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Firefly squid face high predation rates and may serve as the primary food source for some predatory species including northern fur seals, particularly during their yearly migration. The squid spends the day at depths of several hundred meters, returning to the surface when night falls. It uses its
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Cephalopods species have historically been polyandrous, in which a female mates with multiple mates, through common reproductive traits and life history. Firefly squid show rare evidence of cephalopod monogamy in their reproductive cycle when they make a yearly migration to the coastal waters of
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shows that each pigment is contained in individual retinal photoreceptor cells which allows segregation of each pigment to specific locations on the squid retina. Light of specific wavelengths need to reach the specific photoreceptive cells in the retina to avoid longitudinal
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The diet of a firefly squid changes throughout its life stages. During its paralarval stage, its diet is primarily composed of calanoid copepods (zooplankton). Subadult and adult stages see an increase in dietary diversity to include planktonic crustaceans, fishes, and squid.
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has been difficult due to their adaptation to a deep sea environment that is notably cold and dark. Researchers found that long-term sedation (3+ days) of firefly squid can be accomplished using magnesium sulphate with relatively no harm being conferred to the organisms.
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Fishers have long known that firefly squid congregate in Toyama Bay off the Japanese coast to spawn. They are often caught at night when they rise to the surface or in fishing nets that trawl mesopelagic depths during the day. Commercial consumption of the
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is largely driven by the flashing blue display of photophores that makes them considered a menu prized item at restaurants. This squid is commercially fished in Japan, accounting for an annual catch of 4,804 to 6,822 tons from 1990 to 1999.
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Sato, Noriyosi; Tsuda, Sei-Ichiro; Alam, Nur; Sasanami, Tomohiro; Iwata, Yoko; Kusama, Satoshi; Inamura, Osamu; Yoshida, Masa-aki; Hirohashi, Noritaka (2019). "Polyandry is extremely rare in the firefly squid, Watasenia scintillans".
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quickly returned to its normal state only minutes after being transferred into fresh seawater at the final destination. The transported animals maintained their photophore-flashing capabilities, a key focus for researchers.
1200:"A Model for Enhancing the Visual Information Available Under Low-Level Light Conditions: Multiple Contrast Channels Created by Stepwise Changes in Detector Parameters in the Banked Ventral Retina of the Firefly Squid" 907: 1413:
Mori, Junta; Kubodera, Tsunemi; Baba, Norihisa (June 2001). "Squid in the diet of northern fur seals, Callorhinus ursinus, caught in the western and central North Pacific Ocean".
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Sato, Noriyosi; Tsuda, Sei-Ichiro; Nur E. Alam, Md.; Sasanami, Tomohiro; Iwata, Yoko; Kusama, Satoshi; Inamura, Osamu; Yoshida, Masa-aki; Hirohashi, Noritaka (2020-03-07).
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Patel, K. and D. Pee 2011. "Watasenia scintillans" (On-line), Animal Diversity Web. Accessed October 9, 2016 at http://animaldiversity.org/accounts/Watasenia_scintillans/
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Diagram illustrating the basic features of a generic squid. The mantle, eyes, arms, tentacles, buccal membrane, and typical suckers are all shown in this diagram.
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On average, an adult firefly squid is approximately 7.5 cm (3 in) in length. They are brown/red in color, but emit blue and green light by their
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for possessing the characteristic traits of having no tentacle pockets in the head and no suckers on the buccal supports. They belong to the family of
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The firefly squid resides in the deep waters of the Western Pacific Ocean where limited amounts of visual light penetrate from the surface and are
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Teranishi, Katsunori; Shimomura, Osamu (2008-05-01). "Bioluminescence of the arm light organs of the luminous squid Watasenia scintillans".
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reduce or distort absorbed light, a spherical lens to greatly limit distortion (coma and astigmatism), and a predominant visual pigment,
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The lifespan of a firefly squid is about one year. At the end of their lives, females return close to shore to release their
2091: 2236: 702: 2287: 564:. They are caught in bulk during spawning on the shores of Japan and are offered in many restaurants and grocery stores 357: 2292: 1042:
Hamanaka, Toshiaki; Michinomae, Masanao; Seidou, Masatsugu; Miura, Keiko; Inoue, Katsuaki; Kito, Yuji (2011-09-02).
2277: 2244: 2164: 1894:"Low dosage of magnesium sulphate as a long-term sedative during transport of firefly squid, Watasenia scintillans" 1440:
Young, R.E.; Roper, C.F. (1976). "Bioluminescent countershading in midwater animals: evidence from living squid".
613: 2117: 1986: 2000: 1540:"Structural Basis For Wavelength Discrimination in the Banked Retina of the Firefly Squid Watasenis Scintillans" 726: 977:"Bioluminescence reaction catalyzed by membrane-bound luciferase in the "firefly squid," Watasenia scintillans" 318:, or attracting food, but it is still unclear in the scientific community exactly how this species uses their 1587: 1488:"Compensation for Longitudinal Chromatic Aberration in the Eye of the Firefly Squid, Watasenia Scintillans" 506: 2008: 536:
Research was conducted in 2020 around the Oki Islands in the Sea of Japan, a prevalent mating ground for
2013: 2297: 687: 74: 2249: 2169: 1387: 813: 2282: 1388:"Diet composition of the firefly squid, Watasenia scintillans, from Toyama bay, southern Japan sea" 1044:"Luciferase activity of the intracellular microcrystal of the firefly squid, Watasenia scintillans" 908:"Photic environment and bioluminescent cephalopod (Watasenia scintillans) -Firefly squid's MINAGE-" 790: 2156: 1893: 414: 1339:"The functional-morphological adaptive strategy of digestive organs of decapodiform cephalopods" 1160: 2078: 1948: 595:
Historically, firefly squid was never eaten raw in Japan, due to risk of the nematode parasite
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the firefly squid's bioluminescence light up the bay, making their spawning season not only a
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List of Special Places of Scenic Beauty, Special Historic Sites and Special Natural Monuments
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Watanabe, Hikaru; Kubodera, Tsunemi; Moku, Masatoshi; Kawaguchi, Kouichi (June 13, 2006).
8: 378: 153: 39: 1733: 1453: 1298: 1161:"A note on the fibre-optic light-guides in the eye photophores of Watasenia scintillans" 1106: 1869: 1818: 1758: 1717: 1682: 1517: 1363: 1338: 1312: 1071: 202: 69: 1426: 1133: 1090: 993: 976: 2205: 2138: 2021: 1873: 1861: 1822: 1810: 1802: 1763: 1745: 1687: 1669: 1630: 1620: 1569: 1561: 1509: 1465: 1395: 1368: 1221: 1180: 1138: 1120: 1063: 1043: 998: 957: 949: 603:, raw firefly squid can now be served after passing food safety standards set by the 1521: 1075: 851: 767: 2196: 2026: 1905: 1853: 1794: 1753: 1737: 1677: 1661: 1551: 1499: 1457: 1422: 1358: 1350: 1302: 1211: 1172: 1128: 1110: 1055: 988: 941: 906:
Michinomae, Ishikawa; Kabutoyama, Kito; Masanao, Masaki; Nishinomiya, Yuji (2009).
785: 488: 374: 2210: 1059: 556: 1504: 1487: 945: 484: 471: 450: 394: 319: 303: 295: 291: 271: 136: 1926: 1909: 1718:"Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans" 1018:"Observations on Minute Photophores of the Firefly Squid, Watasenia scintillans" 1741: 1176: 302:
between 200 and 400 metres (700 and 1,300 feet; 100 and 200 fathoms). They are
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layout. They are soft-bodied organisms with a skeletal structure composed of
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helps to match the squid's brightness and colour to the sea surface above.
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Bulletin of the Japan Sea National Fisheries Research Institute (Japan)
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Philosophical Transactions of the Royal Society B: Biological Sciences
905: 373:, commonly known as squid. Their body consists of a distinct head and 2065: 694: 390: 325: 126: 86: 1942: 1782: 2190: 1965: 1798: 678: 386: 106: 647: 493: 346: 329: 2130: 2039: 1995: 382: 96: 761: 759: 1280: 1041: 662: 561: 370: 337: 307: 299: 279: 267: 263: 16:
Species of cephalopod also known as the sparkling enope squid
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Fromhage, Lutz; Elgar, Mark A.; Schneider, Jutta M. (2005).
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Michinomae, M; Masuda, H; Seidou, M; Kito, Y (1994-08-01).
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Kawahara, M.; Gleadall, I. G.; Tsukahara, Y. (2010-04-10).
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Biochimica et Biophysica Acta (BBA) - General Subjects
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These tiny squid are found on the shores of Japan in
922: 1898:Journal of Experimental Marine Biology and Ecology 1783:"Faithful Without Care: The Evolution of Monogyny" 981:Biochimica et Biophysica Acta (BBA) - Biomembranes 931: 1648:Parker, Geoff A.; Birkhead, Tim R. (2013-03-05). 2264: 1619:. Joseph Jez (3 ed.). San Diego: Elsevier. 1588:"Map of Life - 'Colour vision' in Firefly squid" 1486:Kröger, Ronald H.H.; Gislén, Anna (2004-08-01). 1412: 298:season, but spend most of their lives in deeper 1385: 1095:Proceedings of the National Academy of Sciences 496:(A1) with a maximal absorption at 482 nm. 1647: 1835: 791:10.2305/IUCN.UK.2014-1.RLTS.T163146A977074.en 444: 389:. They are further classified into the order 1485: 1332: 1330: 1328: 1326: 1241: 1239: 1237: 1235: 328:and actively hunts its food, which includes 811: 349:opportunity but also a tourist attraction. 1439: 470:. When seen from below by a predator, the 48: 29: 1757: 1681: 1555: 1503: 1362: 1336: 1323: 1306: 1252: 1232: 1215: 1132: 1114: 992: 789: 708:Marinated in okizuke (soy, vinegar, sake) 434:abilities to sense and produce light for 397:, based on the hooks on their tentacles. 352: 1891: 1650:"Polyandry: the history of a revolution" 1197: 877: 555: 458: 356: 1165:South African Journal of Marine Science 1025:Scientific Reports Tokosuka City Museum 1015: 849: 720:Firefly squid with grated daikon radish 2265: 1887: 1885: 1883: 1711: 1709: 1707: 1705: 1703: 1701: 1612: 1481: 1479: 1276: 1274: 1272: 1270: 1268: 1266: 1264: 1204:Interdisciplinary Information Sciences 1154: 1152: 605:Ministry of Health, Labour and Welfare 1947: 1946: 1533: 1531: 1433: 1406: 1343:Journal of Veterinary Medical Science 1088: 974: 424: 278:is the sole species in the monotypic 1616:Encyclopedia of biological chemistry 901: 899: 873: 871: 845: 843: 841: 839: 805: 2273:IUCN Red List least concern species 1880: 1698: 1476: 1337:Omura, Ayano; Endo, Hideki (2016). 1261: 1149: 777:IUCN Red List of Threatened Species 13: 1528: 1386:Hayashi, S.; Hirakawa, K. (1997). 975:Tsuji, Frederick I. (2002-08-19). 599:. However, with the use of modern 212:Abralia (Compsoteuthis) nishikawae 14: 2309: 1920: 896: 878:Tsuchiya, Kotaro (October 2015). 868: 850:Preston, Elizabeth (2018-07-03). 836: 766:Barratt, I.; Allcock, L. (2014). 631:Boiled and served with vinegared 551: 421:for the purpose of reproduction. 365:The firefly squid belongs to the 822:World Register of Marine Species 725: 713: 701: 686: 669: 654: 639: 624: 612: 73: 1892:Gleadall, Ian G. (2013-09-01). 1829: 1774: 1641: 1606: 1580: 1544:Journal of Experimental Biology 1379: 1191: 1082: 918:: 280–286 – via ProQuest. 522: 407: 1287:Marine Ecology Progress Series 1035: 1009: 968: 254:), also commonly known as the 1: 1427:10.1016/S0165-7836(01)00233-8 1060:10.1016/j.febslet.2011.07.033 994:10.1016/S0005-2736(02)00447-9 912:Aquabiology/Kaiyo to Seibutsu 749: 531: 487:. The shorter wavelengths of 478: 1505:10.1016/j.visres.2004.04.004 946:10.1016/j.bbagen.2008.01.016 884:The Tree of Life Web Project 507:Scanning electron microscopy 7: 1910:10.1016/j.jembe.2013.02.021 1613:Jacobs, G.H. (2021-01-01). 1592:Convergent Evolution Online 1089:Tsuji, F. I. (1985-07-01). 824:. Flanders Marine Institute 737: 499: 10: 2314: 2288:Molluscs described in 1911 1935: 1927:Tree of Life web project: 1742:10.1038/s41598-020-68006-1 1177:10.2989/025776198784126250 1016:Inamura, O. (1990-12-01). 732:Firefly squid gunkan sushi 590: 448: 445:Bioluminescence and vision 2180: 1955: 1594:. University of Cambridge 1254:10.1101/2019.12.13.875062 1198:Gleadall, Ian G. (1994). 676:Mixed with squid ink and 517: 463:Principle of the squid's 369:class and the superorder 208: 201: 182: 175: 70:Scientific classification 68: 46: 37: 28: 23: 2293:Monotypic mollusc genera 306:organisms and emit blue 2278:Bioluminescent molluscs 2182:Abraliopsis scintillans 1462:10.1126/science.1251214 1116:10.1073/pnas.82.14.4629 880:"Watasenia scintillans" 852:"Flashes of Brilliance" 415:diel vertical migration 379:bilaterally symmetrical 324:The firefly squid is a 1836:Daniel Hannah (2007). 1666:10.1098/rstb.2012.0335 597:Crassicauda giliakiana 565: 560:Firefly squid sold in 475: 362: 353:Anatomy and morphology 231:Abraliopsis scintillan 2001:watasenia-scintillans 1987:Watasenia scintillans 1957:Watasenia scintillans 1929:Watasenia scintillans 816:Watasenia scintillans 770:Watasenia scintillans 559: 462: 449:Further information: 360: 256:sparkling enope squid 251:Watasenia scintillans 186:Watasenia scintillans 1355:10.1292/jvms.15-0185 812:Julian Finn (2016). 784:: e.T163146A977074. 619:Boiled firefly squid 512:spherical aberration 465:counter-illumination 455:Counter-illumination 436:counter-illumination 1734:2020NatSR..1010962S 1557:10.1242/jeb.193.1.1 1454:1976Sci...191.1046Y 1299:2006MEPS..315..187W 1217:10.4036/iis.1994.67 1107:1985PNAS...82.4629T 168:W. scintillans 40:Conservation status 1858:10.1353/cnd.0.0004 1722:Scientific Reports 1660:(1613): 20120335. 1415:Fisheries Research 1308:10.3354/meps315187 566: 476: 425:Diet and predators 363: 266:, is a species of 2298:Molluscs of Japan 2260: 2259: 2139:Open Tree of Life 1949:Taxon identifiers 1626:978-0-12-822040-5 1498:(18): 2129–2134. 1101:(14): 4629–4632. 1054:(17): 2735–2738. 242: 241: 236: 227: 219: 157: 63: 2305: 2253: 2252: 2240: 2239: 2227: 2226: 2214: 2213: 2201: 2200: 2199: 2173: 2172: 2160: 2159: 2147: 2146: 2134: 2133: 2121: 2120: 2108: 2107: 2095: 2094: 2082: 2081: 2069: 2068: 2056: 2055: 2043: 2042: 2030: 2029: 2017: 2016: 2004: 2003: 1991: 1990: 1989: 1976: 1975: 1974: 1944: 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Index


Conservation status
Least Concern
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Mollusca
Cephalopoda
Oegopsida
Enoploteuthidae
Watasenia
Ishikawa
Binomial name
Berry
Synonyms
Pfeffer
Japan
squid
Enoploteuthidae
genus
springtime
spawning
waters
bioluminescent
light
photophores
camouflage
bioluminescence.

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