Knowledge (XXG)

Japanese eel

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permit. The goal of this act was to slow down the over fishing of the Japanese eel and control the number of eels being taken into captivity. In the future there is a law being placed that in December 2023 that makes fishing glass eels without a permit punishable with up to 3 years in prison or a 30 million Japanese yen fine. There have also been efforts made to stop the habitat loss of this species through the Nature-oriented river works. The high price and demand of this species means that there is also need for the Act on "Ensuring the Proper Domestic Distribution and Importation of Specified Aquatic Animals and Plants" that prohibits harvesting and culturing these eels without a permit that was put in place in 2020.
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their migration. An eel at this stage in its life cycle is 6 cm long with an intense instinct to swim upstream. This instinct allows them to scale any scenario and attempt to make it to their permanent habitat. During this migration, the eels are not presented with many predators as they are not commonly preyed on during the eel's life cycle stage. This low number of predators could also affect the nocturnal nature of the eels during this time. They chose to swim upstream during the night hours and hide under banks and rockets of the river during the day. Two weeks into this migration, the eels develop a black coloring and metamorphosis from elvers to brown-stage eels to continue their journey.
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due to the breeding habits. Scientists and farmers have never been able to breed an eel, so this species' agriculture relies heavily on their catch in their elver stage. A net is strewn across the rivers that these eels migrate up in the early autumn, and then they are transported to cultured ponds to grow to commercial size. The female eel grows to a much bigger size and has a longer life span than the male eel therefor; the cultured population is made up of 90% female eel. The heavy farming of this species has negatively impacted the conservation of the species; however, the production and consumption have not slowed.
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salinity front separating the north equatorial current from the tropical waters. This front is an indicator to tell the eels that they are in their preferred spawning location. The North Equatorial Current assists the eels in migrating from the center of the Pacific Ocean to the coast of Asia; without this indicator, the larvae would end up in the Mindanao Current.
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environment as it relies significantly on the color of the water. The eels grow to around their adult size in this stage as well during this time, which is up to 57 – 60 cm for females and 35 cm for males. At 30 cm, the eels grow sexual organs for the first time and prepare to make their great migration.
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northward shift in the front that occurred over the past 30 years appears to have occurred, which could cause more larvae to be retained in eddies offshore in the region east of Taiwan, and southward shifts in the salinity front have been observed in recent years that could increase southward transport into the
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Once these eels reach adulthood, they develop a silvery color under their skin. This change in appearance signaling that they are entering their last stage of life, the silver stage. During this time, the eels prepare to migrate to the spawning area by naturally producing more oil in their body. This
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in its blood that can cause harm to any mammals that ingest it, including humans. However, there is no need for any special procedures as temperatures of 58–70 °C (136–158 °F) destroy the toxin. Thus, Japanese eels are always cooked before consumption, even unagi sushi. Eels intended to be
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There are multiple preservation effectors that the Japanese government is undertaking to slow or stop the extinction of this highly important species for their consumption. In 2015 the Inland Water Fishery Promotion Act was put in place preventing the fishing and culturing of eels without the proper
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Another factor that is effecting the Japanese eels is habitats loss. The coast is becoming a more preferred location for humans to live as the climate and pollution continues to worsen taking away from the habitat of these eels. On average from 1970s–2010s, 76.8% of the Japanese eels habitat is lost
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were captured using large midwater trawls in 2008 by Japanese scientists at the Fisheries Research Agency. The adults of the Japanese eel appear to spawn in the upper few hundred meters of the ocean, based on the recent catches of their spawning adults, eggs, and newly hatched larvae. The timing of
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The brown-stage, also known as the yellow stage, stage of the eel's life lasts for 5–10 years, and during this time, the eel feeds on worms and insects. The characteristics of this stage include a dull pigment with a grey, brown, and greenish top and white underbelly. This pigment is related to the
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As these glass eels reach their freshwater habitats from December to April they become known as Elvers. The migration time of this species corresponds with the moon as it affects the tide. This time is during a tide that occurs at night and simulates a flood making it easier for the eels to survive
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to their spawning area without feeding. The eels are able to travel this long distance without nutrients because of the oils they collect in their bodies before the migration out to sea. The spawning area for this species is approximately 15°N, 140°E, a location corresponding with the location of a
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The culturing of eels was started in Japan in 1894 and has become the most significant eel culture industry in the world since. Japan is the biggest consumer and producer of eels generating approximately 70 - 90% of the eel population as of 1991. The farming of the Japanese eel is challenging
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The decline of the population of the Japanese eel is also directly related to the strong connection that the eel's life cycle has with the temperature of the water. This species relies on this environmental signal to know when to migrate in and out of their fresh water habitat; thus, the change in
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The discovery of the Japanese eel breeding location was a new finding in 1991 when R.V. Hakuho Maru performed a research cruise. Before this research cruise, little was known about how eels breed, and there is still so much to learn as these eels remain a mystery to many scientists. Until the late
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In the case of the Japanese eel's spawning is likely affected by the north–south shifts of a salinity front created by an area of low-salinity waters resulting from tropical rainfall. The front is thought to be detected by the adult spawning eels and to affect the latitudes at which they spawn. A
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The Japanese eel has the ability to produce the protein UnaG which makes it unique among vertebrates. This protein is only found in the muscles of this species of eels making it a rare commodity. UnaG has demonstrated utility in life sciences and can be used to fluorescently label cells and tag
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oil is stored in the muscles of the eels and is approximately 20% of their body mass. Once the appropriate content of the oil is reached, the eels stop feeding. During the autumn and generally on the last quarter of the moon, the eels migrate downstream to the center of the pacific.
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Since then, more pre-leptocephali were collected at sea, and even Japanese eel eggs have been collected and genetically identified on the research vessel. The collections of eggs and recently hatched larvae have been made along the western side of the seamount chain of the
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Chow, S.; Kurogi, H; Katayama, S; Ambe, D; Okazaki, M; Watanabe, T; Ichikawa, T; Kodama, M; Aoyama, J; Shinoda, A; Watanabe, S; Tsukamoto, K; Miyazaki, S; Kimiura, S; Yamada, Y; Nomura, K; Tanaka, H; Kazeto, Y; Hata, K; Handa, T; Tawa, A; Mochioka, N (2010).
522:. These eels are having a more challenging time knowing when to migrate. When migrating into their freshwater habitats, they prefer 8 to 10 degrees Celsius, a temperature usually reached in the autumn months but is getting later and later. 395:, hatch from the egg approximately 36 hours after fertilization. These leptocephalius grow from 7.9 to 34.2 mm, growing by 0.56 mm daily. After riding the north equatorial current, the leptocephali take and head northward by the 479:
stage. The glass eels then enter the estuaries and headwaters of rivers and many travel upstream. In fresh water and estuaries, the diet of yellow eels consists mainly of shrimp, other crustaceans, aquatic insects, and small fishes.
345:. However, presumably due to a combination of overfishing and habitat loss or changing water conditions in the ocean interfering with spawning and the transport of their leptocephali this species is endangered. 1230:
Kimura, S.; Inoue, Takashi; Sugimoto, Takashige (2001). "Fluctuation in the distribution of low-salinity water in the North Equatorial Current and its effect on the larval transport of the Japanese eel".
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found a more precise location of spawning based on genetically identified specimens of newly hatched pre-larva only 2 to 5 days old in a small area near the Suruga Seamount to the west of the
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After hatching in the ocean, the leptocephali are carried westward by the North Equatorial Current and then northward by the Kuroshio Current to East Asia. before they metamorphose into the
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ponds in most countries, the Japanese eel makes up 95% of the commercially sold eel in Japan, the other 5% is shipped over by air to the country from Europe. This food in Japan is called
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20th century, scientists hypothesized that the different stages of the eel's life cycle were entirely different species. Then in 2005, the same team of Japanese scientists at the
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Chow, S.; Kurogi, Hiroaki; Mochioka, Noritaka; Kaji, Shunji; Okazaki, Makoto; Tsukamoto, Katsumi (2009). "Discovery of mature freshwater eels in the open ocean".
698:, with the latter being the method which the eels are often prepared. Kabayaki eels are prepared by being cut into fillets, deboned, skewered, marinated in sweet 2058: 1440:
Kumagai, Akiko; Ando, Ryoko; Miyatake, Hideyuki; Greimel, Peter; Kobayashi, Toshihide; Hirabayashi, Yoshio; Shimogori, Tomomi; Miyawaki, Atsushi (June 2013).
502:. These types of unfavorable larval transport are thought to reduce the recruitment success of the Japanese eels that reach river mouths as glass eels. 2125: 1993: 1315:"Anguilla japonica: Pike, C., Kaifu, K., Crook, V., Jacoby, D. & Gollock, M.: The IUCN Red List of Threatened Species 2020: e.T166184A176493270" 946: 2032: 1664:
https://web.archive.org/web/20100706014923/http://www.montereybayaquarium.org/cr/cr_seafoodwatch/content/media/MBA_SeafoodWatch_UnagiReport.pdf
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catches of eggs and larvae and the ages of larger larvae have shown that Japanese eels only spawn during the few days just before the
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proteins when exogenously expressed. This protein has been used in an experimental diagnostic test to assess liver function.
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The Japanese eel metamorphoses into five stages throughout its life cycle, all with their distinct names. In the open ocean,
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to east Asia. These eels live in rivers, lakes, and estuaries until they return to the ocean as adults to breed and die off.
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Japanese eels are a good source of a wide range of vitamins and minerals. A serving of 100 grams contains roughly 120% of
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water temperature is directly proportional to the decline in population size. These rising water temperatures to
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in the western North Pacific. Adult Japanese eels migrate thousands of kilometers from freshwater rivers in
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Sato, Naoyuki; Ishii, Keiko; Satoh, Akio; Tanaka, Yasuo; Hidaka, Toshio; Nagaoka, Noboru (December 2005).
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do not assimilate nutrition during the oceanic spawning migration: Evidence from stable isotope analysis"
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type dish where fillets of eels are served over rice in a large bowl. Japanese eel is also served as
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A taste of Japan : food fact and fable : what the people eat : customs and etiquette
515: 381: 339:; they are an essential part of the food culture, with many restaurants serving grilled eel called 39: 1606: 1328: 1203: 1176: 1133: 1078: 843: 839: 758:
Due to the decline of the population of the Japanese eels, they are often being substituted with
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a dish consisting of the better cuts of eel served in a lacquered box over steamed rice, and
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Between April and November, the Japanese eels leave their freshwater river habitats in
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used in sushi are usually sold in pre-cooked fillets by many sushi suppliers.
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Total production of Japanese eel in thousands of tonnes as reported by the
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Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
1788:"[Residues of total mercury and methyl mercury in eel products]" 1268:"Impact of long-term habitat loss on the Japanese eel Anguilla japonica" 1998: 847: 724: 452: 310: 2011: 1985: 1032: 1003: 967: 1121: 831: 807: 719: 96: 1862: 1065: 1048: 1972: 751: 744: 728: 688: 681: 568: 558: 504: 442: 417: 368: 335: 306: 302: 298: 1959: 451:
The Japanese eel and other anguillid eels live in freshwater and
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Pike, C.; Kaifu, K.; Crook, V.; Jacoby, D.; Gollock, M. (2020).
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As a food product, the Japanese eel is commonly referred to as
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Yoshida, Mireiyu; Sone, Seiji; Shiomi, Kazuo (December 2008).
575: 294: 126: 1837:"Mercury Levels in Commercial Fish and Shellfish (1990-2012)" 1491:"First Fluorescent Protein Identified in a Vertebrate Animal" 766:, even within Japan, where Japanese eels were commonly used. 1835:
Nutrition, Center for Food Safety and Applied (2022-02-25).
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Nutrition, Center for Food Safety and Applied (2022-02-25).
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Chen, Jian-Ze; Huang, Shiang-Lin; Han, Yu-San (2014-12-05).
1442:"A Bilirubin-Inducible Fluorescent Protein from Eel Muscle" 1657: 1655: 1521:"Unagi and Anago: 8 Wonderful Ways to Eat Japanese Eel" 455:, an area where a freshwater river meets the ocean. 1875: 1714: 1712: 1710: 1708: 655: 645: 640: 624: 616: 604: 599: 594: 472:period of each month during their spawning season. 1198:. Hong Kong: Wishing Printing Company. p. 75. 595:Bilirubin-inducible green fluorescent protein UnaG 1098:"Discovery of the spawning area for Japanese eel" 739:a type of sushi containing eel and cucumber, and 1324:10.2305/iucn.uk.2020-3.rlts.t166184a176493270.en 896:10.2305/IUCN.UK.2020-3.RLTS.T166184A176493270.en 279: 961: 959: 957: 955: 509:example of growth of human population by water 286: 1403:"A review of eel culture in Japan and Europe" 784:. They are also a source of vitamins such as 8: 850:. They contain relatively low quantities of 846:, albeit not as much as other seafood, like 780:and 126% of the recommended daily value of 564:Green water culture system for Japanese eel 1863: 1548:. Kodansha International. pp. 62–69. 710:. Eels are eaten all year round in Japan. 637: 48: 29: 20: 1803: 1457: 1322: 1064: 1031: 894: 411:, the first stage after the egg, feed on 463:. Mature adults of the Japanese eel and 1047:Tsukamoto, Katsumi (23 February 2006). 863: 826:are also present, along with traces of 1694: 1683: 1501:from the original on November 20, 2019 1349: 1338: 1212: 1201: 713:Dishes made with Japanese eel include 591: 357:to breed larvae in the ocean near the 7: 1272:Estuarine, Coastal and Shelf Science 882:IUCN Red List of Threatened Species 1419:10.1111/j.1365-2109.1991.tb00495.x 1194:Man, S.H.; Hodgkiss, I.J. (1981). 1049:"Spawning of eels near a seamount" 534:The Japanese Eel is considered an 14: 1624:Tesch, Friedrich-Wilhelm (2003). 1096:Tsukamoto, Katsumi (April 1992). 838:. Additionally, they are rich in 317:. Like all the eels of the genus 2126:IUCN Red List endangered species 1253:10.1046/j.1365-2419.2001.00159.x 73: 1387:Based on data sourced from the 1377:. July 14, 2022. pp. 1–5. 1012:Marine Ecology Progress Series 1: 1401:Heinsbroek, L. T. N. (1991). 842:and contain a good amount of 735:. Some notable types include 750:The Japanese eel contains a 293:) is a species of anguillid 1196:Hong Kong freshwater fishes 747:made with eel and avocado. 280: 243:Jordan & Evermann, 1902 2177: 1459:10.1016/j.cell.2013.05.038 1292:10.1016/j.ecss.2014.06.004 679: 588:Scientific and medical use 391:The larvae, also known as 313:, as well as the northern 2151:Marine fauna of East Asia 1805:10.3358/shokueishi.46.298 1587:10.1007/s10930-008-9155-y 1173:10.1007/s12562-008-0017-5 636: 287: 204: 197: 175: 168: 70:Scientific classification 68: 46: 37: 28: 23: 518:and the thinning of the 439:Life history and habitat 388:(14–17° N, 142–143° E). 374:North Equatorial Current 359:North Equatorial Current 2146:Freshwater fish of Asia 1544:Richie, Donald (1985). 889:: e.T166184A176493270. 2161:Fish described in 1846 1348:Cite journal requires 1233:Fisheries Oceanography 972:. Fishing News Books. 966:Atsushi, Usui (1991). 580: 566: 526:to human development. 510: 448: 423: 376: 1489:Baker, Monya (2013). 1368:"Joint Press Release" 572: 562: 508: 446: 421: 372: 1407:Aquaculture Research 498:that flows into the 208:Anguilla angustidens 1575:The Protein Journal 1495:Scientific American 1313:IUCN (2018-11-06). 1284:2014ECSS..151..361C 1245:2001FisOc..10...51K 1165:2009FisSc..75..257C 1114:1992Natur.356..789T 1024:2010MEPS..402..233C 844:omega-3 fatty acids 810:. Minerals such as 745:western-style sushi 516:ocean acidification 382:University of Tokyo 219:Chu & Jin, 1984 40:Conservation status 1763:"FoodData Central" 1720:"FoodData Central" 1211:Unknown parameter 949:, in creatures.net 731:, commonly called 581: 567: 536:endangered species 511: 461:West Mariana Ridge 449: 424: 377: 256:Muraena pekinensis 235:Chu & Wu, 1984 232:Anguilla nigricans 216:Anguilla breviceps 2113: 2112: 2085:Open Tree of Life 1921:Anguilla_japonica 1907:Anguilla japonica 1877:Anguilla japonica 1869:Taxon identifiers 1693:Missing or empty 1637:978-1-4051-7343-8 1389:FishStat database 1153:Fisheries Science 1108:(6372): 789–791. 1033:10.3354/meps08448 1006:Anguilla japonica 875:Anguilla japonica 669: 668: 665: 664: 610:Anguilla japonica 465:giant mottled eel 275:Anguilla japonica 266: 265: 260: 252: 248:Anguilla sinensis 244: 240:Anguilla remifera 236: 228: 220: 212: 179:Anguilla japonica 63: 2168: 2106: 2105: 2093: 2092: 2080: 2079: 2067: 2066: 2054: 2053: 2041: 2040: 2028: 2027: 2015: 2014: 2002: 2001: 1989: 1988: 1976: 1975: 1963: 1962: 1950: 1949: 1937: 1936: 1924: 1923: 1911: 1910: 1909: 1896: 1895: 1894: 1864: 1845: 1844: 1832: 1826: 1825: 1807: 1783: 1777: 1776: 1774: 1773: 1767:fdc.nal.usda.gov 1759: 1753: 1752: 1740: 1734: 1733: 1731: 1730: 1724:fdc.nal.usda.gov 1716: 1703: 1702: 1696: 1691: 1689: 1681: 1679: 1678: 1672: 1666:. Archived from 1659: 1650: 1649: 1621: 1615: 1614: 1581:(7–8): 450–454. 1566: 1560: 1559: 1541: 1535: 1534: 1532: 1531: 1516: 1510: 1509: 1507: 1506: 1486: 1480: 1479: 1461: 1452:(7): 1602–1611. 1437: 1431: 1430: 1398: 1392: 1385: 1379: 1378: 1372: 1364: 1358: 1357: 1351: 1346: 1344: 1336: 1326: 1310: 1304: 1303: 1263: 1257: 1256: 1227: 1221: 1220: 1214: 1209: 1207: 1199: 1191: 1185: 1184: 1148: 1142: 1141: 1122:10.1038/356789a0 1093: 1087: 1086: 1068: 1044: 1038: 1037: 1035: 998: 992: 991: 963: 950: 944: 938: 937: 935: 933: 924:. Archived from 914: 908: 907: 905: 903: 898: 868: 638: 612: 592: 496:Mindanao Current 397:Kuroshio Current 292: 290: 289: 283: 259:Basilewsky, 1855 258: 251:McClelland, 1844 250: 242: 234: 226: 224:Anguilla manabei 218: 210: 181: 161:A. japonica 78: 77: 57: 52: 51: 33: 21: 2176: 2175: 2171: 2170: 2169: 2167: 2166: 2165: 2156:Endangered fish 2116: 2115: 2114: 2109: 2101: 2096: 2088: 2083: 2075: 2070: 2062: 2057: 2049: 2044: 2036: 2031: 2023: 2018: 2010: 2005: 1997: 1992: 1984: 1979: 1971: 1966: 1958: 1953: 1945: 1940: 1932: 1927: 1919: 1914: 1905: 1904: 1899: 1890: 1889: 1884: 1871: 1854: 1849: 1848: 1834: 1833: 1829: 1785: 1784: 1780: 1771: 1769: 1761: 1760: 1756: 1742: 1741: 1737: 1728: 1726: 1718: 1717: 1706: 1692: 1682: 1676: 1674: 1670: 1661: 1660: 1653: 1638: 1623: 1622: 1618: 1568: 1567: 1563: 1556: 1543: 1542: 1538: 1529: 1527: 1518: 1517: 1513: 1504: 1502: 1488: 1487: 1483: 1439: 1438: 1434: 1400: 1399: 1395: 1386: 1382: 1370: 1366: 1365: 1361: 1347: 1337: 1312: 1311: 1307: 1265: 1264: 1260: 1229: 1228: 1224: 1210: 1200: 1193: 1192: 1188: 1150: 1149: 1145: 1095: 1094: 1090: 1066:10.1038/439929a 1046: 1045: 1041: 1000: 999: 995: 980: 965: 964: 953: 945: 941: 931: 929: 916: 915: 911: 901: 899: 870: 869: 865: 860: 840:dietary protein 796: 789: 774: 684: 678: 608: 590: 579: 565: 557: 548: 532: 491: 486: 441: 405: 386:Mariana Islands 351: 321:and the family 284: 193: 183: 177: 164: 72: 64: 53: 49: 42: 17: 16:Species of fish 12: 11: 5: 2174: 2172: 2164: 2163: 2158: 2153: 2148: 2143: 2138: 2133: 2128: 2118: 2117: 2111: 2110: 2108: 2107: 2094: 2081: 2068: 2055: 2042: 2029: 2016: 2003: 1990: 1977: 1964: 1951: 1938: 1925: 1912: 1897: 1881: 1879: 1873: 1872: 1867: 1861: 1860: 1853: 1852:External links 1850: 1847: 1846: 1827: 1798:(6): 298–304. 1778: 1754: 1735: 1704: 1651: 1636: 1616: 1561: 1555:978-4770017079 1554: 1536: 1511: 1481: 1432: 1393: 1380: 1359: 1350:|journal= 1305: 1258: 1222: 1186: 1159:(1): 257–259. 1143: 1088: 1039: 1004:"Japanese eel 993: 978: 951: 947:Vietnam Faunas 939: 928:on 28 May 2014 909: 862: 861: 859: 856: 794: 787: 772: 741:rock and roll, 680:Main article: 677: 674: 667: 666: 663: 662: 657: 653: 652: 647: 643: 642: 634: 633: 628: 622: 621: 618: 614: 613: 606: 602: 601: 597: 596: 589: 586: 573: 563: 556: 553: 547: 544: 531: 528: 490: 487: 485: 482: 440: 437: 422:Eel life cycle 404: 401: 393:leptocephalius 350: 347: 264: 263: 262: 261: 253: 245: 237: 229: 221: 213: 202: 201: 195: 194: 184: 173: 172: 166: 165: 158: 156: 152: 151: 144: 140: 139: 134: 130: 129: 127:Anguilliformes 124: 120: 119: 117:Actinopterygii 114: 110: 109: 104: 100: 99: 94: 90: 89: 84: 80: 79: 66: 65: 47: 44: 43: 38: 35: 34: 26: 25: 15: 13: 10: 9: 6: 4: 3: 2: 2173: 2162: 2159: 2157: 2154: 2152: 2149: 2147: 2144: 2142: 2141:Fish of Japan 2139: 2137: 2134: 2132: 2129: 2127: 2124: 2123: 2121: 2104: 2099: 2095: 2091: 2086: 2082: 2078: 2073: 2069: 2065: 2060: 2056: 2052: 2047: 2043: 2039: 2034: 2030: 2026: 2021: 2017: 2013: 2008: 2004: 2000: 1995: 1991: 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Index


Conservation status
Endangered
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Actinopterygii
Anguilliformes
Anguillidae
Anguilla
Binomial name
Temminck
Schlegel
Synonyms
eel
Japan
Korea
China
Vietnam
Philippines
Anguillidae
catadromous
aquaculture
unagi
kabayaki
East Asia
North Equatorial Current

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