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Mueller's pearlside

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end of the winter, adults underwent interrupted ascents, migrating to depths that were greater than reached during typical DVM as they preyed on deep-wintering prey partway through their seasonal ascent to the surface. Some individuals undertook a reversed DVM during winter, diving to slightly greater depths during daylight hours, to feed on deep-overwintering prey in optimal light conditions. In the
363: 392:. In fresh-caught specimens, these photophores are coloured a light pink/purple. They have 9 to 12 dorsal fin rays, 17-19 pectoral fin rays, 7 pelvic fin rays and 22 to 28 anal fin rays. They can grow up to 8 centimetres (3.1 in) at maximum length, but usually grows up to 4 centimetres (1.6 in). 814:
attempting to pursue it as a resource after the collapse of other fisheries, with no nation landing more than 50,000 tonnes in a single year. The species continues to be a focus of speculation for future mesopelagic fisheries, however a number of technical hurdles will need to be surmounted in order
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at depth, were abundant, adults in the winter delayed their vertical migration until approximately three hours before dawn due potentially to a reduced need to feed at the surface, with some individuals remaining at depth for the entire night, feeding entirely on deep-overwintering prey. Towards the
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breaks, and is scarce in the open ocean. This species is predominantly found at depths of around 150 to 250 metres (490 to 820 ft) during the day, but can be found as shallow as 50 metres (160 ft) during the nighttime. They can be found in depths of at least 1,527 metres (5,010 ft) at
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is regionally variable. In the Benguela system, breeding occurs year round, while in Australia spawning occurs in late winter and early spring. In Norway, spawning occurs between March and September, however hatch timing is a strong predictor of recruitment success, with individuals hatching before
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in scattering layers can detect predators at distances of several metres during the day, and respond by diving as far as 50m below their original depths at speeds of 15–20 cm/s. While most individuals reside in scattering layers to reduce predation risk, certain "bold individuals" will make
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Bravo Rebolledo, Elisa L.; IJsseldijk, Lonneke L.; Solé, Liliane; Begeman, Lineke; de Vries, Simon; van den Boom, Louis; Camalich Carpizo, Jaime; Leopold, Mardik F. (2016-12-01). "Unorthodox Sampling of a Fin Whale's (Balaenoptera physalus) Diet Yields Several New Mesopelagic Prey Species".
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Folkvord, Arild; Gundersen, Geir; Albretsen, Jon; Asplin, Lars; Kaartvedt, Stein; Giske, Jarl (February 2016). Marshall, C. Tara (ed.). "Impact of hatch date on early life growth and survival of Mueller's pearlside ( Maurolicus muelleri ) larvae and life-history consequences".
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mid-September experiencing poor conditions for growth. Females mature at lengths of around 35mm, at the end of their first year, and fish below 30mm cannot be sexed. A small fraction of individuals survive into their second year, reaching lengths of up to 50mm in Australia.
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Cavallaro, M.; Mammola, C. L.; Verdiglione, R. (June 2004). "Structural and ultrastructural comparison of photophores of two species of deep-sea fishes: Argyropelecus hemigymnus and Maurolicus muelleri: comparison of photophores in two species of fishes".
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Cartes, Joan E.; Hidalgo, Manuel; Papiol, Vanesa; Massutí, Enric; Moranta, Joan (March 2009). "Changes in the diet and feeding of the hake Merluccius merluccius at the shelf-break of the Balearic Islands: Influence of the mesopelagic-boundary community".
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de Busserolles, Fanny; Cortesi, Fabio; Helvik, Jon Vidar; Davies, Wayne I. L.; Templin, Rachel M.; Sullivan, Robert K. P.; Michell, Craig T.; Mountford, Jessica K.; Collin, Shaun P.; Irigoien, Xabier; Kaartvedt, Stein; Marshall, Justin (2017-11-03).
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forays into shallower waters above scattering layers, presumably in order to feed in move favourable light levels. It is unknown whether these bold individuals are atypical or whether a change in individual state (e.g. hunger) prompts these forays.
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Klimpel, Sven; Kellermanns, Esra; Palm, Harry W.; Moravec, František (2007-05-30). "Zoogeography of fish parasites of the pearlside (Maurolicus muelleri), with genetic evidence of Anisakis simplex (s.s.) from the Mid-Atlantic Ridge".
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having a "light comfort zone", inhabiting depths where light levels are neither too bright nor too dark. Individual fish may move between scattering layers, indicating that the comfort zones are broader than suggested in the typical
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Eduardo Grimaldo; Leif Grimsmo; Paula Alvarez; Bent Herrmann; Guro Møen Tveit; Rachel Tiller; Rasa Slizyte; Naroa Aldanondo; Trude Guldberg; Bendik Toldnes; Ana Carvajal; Marte Schei; Merethe Selnes (December 2020).
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are made up of several parts. The photogenic chamber, made up of small, spherical light-producing cells, is split into a subspherical tank and conic projector, embedded inside a reflector made of
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than that descriptor usually entails. The specific nature of this migration can vary seasonally, between years, an across geography, as well as across the ontogeny of individual fishes.
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displayed consistent, typical DVM patterns (i.e. remaining at depth during the day and ascending to the surface at night) during summer months only, with individuals feeding at
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Young, J. W.; Blaber, S. J. M. (October 1986). "Feeding ecology of three species of midwater fishes associated with the continental slope of eastern Tasmania, Australia".
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host to a variety of parasitic taxa, with very few parasites reaching adulthood while infecting the pearlside. For example, in a study that examined 1329 individual
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Lopes, Plàcida do Carmo (1979). "Eggs and larvae of Maurolicus muelleri (Gonostomatidae) and other fish eggs and larvae from two fjords in western Norway".
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inhabits a tertiary trophic position and, as such, provides a trophic link between zooplankton and larger predators. A wide range of fish species prey on
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is found in cells transmuted into a rod-like morphology. These rod-like cone receptors are tuned to the blue-shifted mesopic light conditions dominant in
1806:"Reproductive biology and spawning of the myctophid Lampanyctodes hectoris and the sternoptychid Maurolicus muelleri in the southern Benguela Ecosystem" 1493:
Hamre, Lars Are; Karlsbakk, Egil (March 2002). "Metazoan parasites of Maurolicus muelleri (Gmelin) (Sternoptychidae) in Herdlefjorden, western Norway".
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Armstrong, M. J.; Prosch, R. M. (June 1991). "Abundance and distribution of the mesopelagic fish Maurolicus muelleri in the southern Benguela system".
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Individual females can contain as many as 738 ova, and in enclosed spaces eggs can be extremely abundant, reaching numbers as high as 5.8x10^11 in
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Kaartvedt, S; Knutsen, T; Holst, JC (1998). "Schooling of the vertically migrating mesopelagic fish Maurolicus muelleri in light summer nights".
745:, DVM is known to occur, with fish ascending to within 10m of the surface in response to the first light of dawn before diving into deep waters. 459:'s habitat and are likely a more efficient method of mesopic vision than would be feasible with two improperly-functioning photoreceptor types. 1143:
Rasmussen, O. I.; Giske, J. (1994-11-01). "Life-history parameters and vertical distribution of Maurolicus muelleri in Masfjorden in summer".
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of secondary importance near Japan. Euphausiids and copepods are the dominant prey items year-round off near the eastern continental slope of
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Ankenbrandt, Lisa (1985). "Food habits of bait-caught Skipjack Tuna, Katsuwonus pelamis, from the Southwestern Atlantic Ocean".
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crystals. Ventral to the photogenic chamber is a cellular lens that is itself covered on the ventral surface by a gelatinous
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Christiansen, Svenja; Klevjer, Thor A; Røstad, Anders; Aksnes, Dag L; Kaartvedt, Stein (2021-09-07). Proud, Roland (ed.).
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Mueller's pearlside is a zooplanktivore, with exact diet composition varying geographically and seasonally. For example,
2117: 39: 33: 134: 695: 2265: 981:"Pushing the limits of photoreception in twilight conditions: The rod-like cone retina of the deep-sea pearlsides" 50: 2371: 1045:"Diet composition and prey size of the mesopelagic fish Maurolicus muelleri (Sternoptychidae) in the Japan sea" 452: 2007:"Investigating the potential for a commercial fishery in the Northeast Atlantic utilizing mesopelagic species" 1289:
Bjelland, Otte; Monstad, Terje (1997). "Blue whiting in the Norwegian Sea, spring and summer 1995 and 1996".
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Kawamura, Akito (1973). "Food and feeding of Sei Whales in waters south of 40°N in the North Pacific".
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to provide camouflage in the open-ocean, with a dark dorsal surface, silvered flanks and clustered
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Lordan, C.; Burnell, G. M.; Cross, T. F. (December 1998). "The diet and ecological importance of
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Diel vertical migration and feeding pattern of M. muelleri in Masfjorden in late autumn
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Cha, Byung-Yul (1998). "Spawning ecology and feeding habits of Maurolicus muelleri".
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maximum. It lives in tropical, subtropical and temperate waters in the deep sea.
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Their behaviour, however, varied in the autumn and winter. In years where their
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specimens, 3720 parasites were found with only 5 individual adult parasites.
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is of minor importance to fisheries, with several countries, including
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In latitudes where summer nights are short and bright, such as in the
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has a fusiform body shape with a moderately sized, subvertical mouth.
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Derogenes varicose, Brachyphallus crenatus, and Lecithaster confusus
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inhabits surface waters only during twilight hours, requiring acute
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which in most vertebrates is achieved through combining dim-light
361: 345: 290:, found in deep tropical, subtropical and temperate waters of the 2291: 854: 2083: 2069:, (William Collins Publishers Ltd, Auckland, New Zealand 1982) 765:
in shallow waters at night to reduce the threat of predation.
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has large eyes with a retina uniquely adapted to the animal's
18: 683:(DVM), however this behaviour is more complex and varied in 694:
has been best studied in Masfjorden, where a fifteen-month
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Fishes of the North-eastern Atlantic and the Mediterranean
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Distribution, Growth, and Reproduction of the Lightfish
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One of the only species to reach adulthood parasitising
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Deep Sea Research Part I: Oceanographic Research Papers
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from subpolar waters to the equator, as well as in the
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is most abundant around bathymetric features such as
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to make pearlsides a cost-effective fishery target.
2092: 1181:Hassani, S; Antoine, L; Ridoux, V (December 1997). 524:, including commercially-important species such as 447:have developed a unique photoreceptor where a cone 1875:Canadian Journal of Fisheries and Aquatic Sciences 1394:Scientific Reports of the Whale Research Institute 1614:Staby, A; Røstad, A; Kaartvedt, S (2011-11-15). 1312:(Cephalopoda: Ommastrephidae) in Irish waters". 864:10.2305/IUCN.UK.2019-2.RLTS.T198760A21913754.en 514:have also been reported from stomach contents. 325:, however they are absent in the Indian Ocean. 2067:Collins Guide to the Sea Fishes of New Zealand 1953:Standal, Dag; Grimaldo, Eduardo (2020-09-01). 476:are the main constituent of their diet in the 1586:(Report). CSIRO Marine Laboratories Reports. 1199:Journal of Northwest Atlantic Fishery Science 8: 1124:(Master thesis). The University of Bergen. 1043:Ikeda, T; Hirakawa, K; Kajihara, N (1994). 2080: 1581:(Sternoptychidae) off South-East Australia 884: 882: 880: 878: 876: 874: 480:and in waters surrounding Korea, with the 400:Photophores are glandular organs that, in 108: 89: 80: 2032: 2022: 1980: 1970: 1894: 1821: 1777: 1697: 1687: 1641: 1631: 1428: 1368: 1210: 1012: 862: 69:Learn how and when to remove this message 32:This article includes a list of general 2052:Integrated Taxonomic Information System 1810:South African Journal of Marine Science 1723:South African Journal of Marine Science 1357:South African Journal of Marine Science 1314:South African Journal of Marine Science 824: 830: 828: 2382:Taxa named by Johann Friedrich Gmelin 1851:(Gonostomatidae) in Norwegian waters" 1799: 1797: 1665: 1663: 1661: 1609: 1607: 1605: 1603: 1570: 1568: 1566: 1564: 1562: 1560: 1488: 1486: 1484: 1176: 1174: 1049:Bulletin of Plankton Society of Japan 917:Peter James Palmer Whitehead (1986). 7: 2331:1C2C4D64-2465-B63A-9B7F-D0B5C35F9B45 1038: 1036: 1034: 1032: 2367:IUCN Red List least concern species 846:IUCN Red List of Threatened Species 354:, showing the photophores used for 675:As with many mesopelagic species, 38:it lacks sufficient corresponding 14: 2065:Tony Ayling & Geoffrey Cox, 965:10.1111/j.0022-1112.2004.00410.x 302:of 8 centimetres (3.1 in). 133: 23: 835:A. Harold; R. Milligan (2019). 698:was undertaken. In Masfjorden, 2011:ICES Journal of Marine Science 1932:10.1080/00364827.1979.10411382 1758:Marine Ecology Progress Series 1676:ICES Journal of Marine Science 1620:Marine Ecology Progress Series 1417:Marine Ecology Progress Series 1349:"Diet and mandibular growth of 1: 1847:"Life history and ecology of 1068:Korean Journal of Ichthyology 585:Due to its trophic position, 561:and marine mammals including 276:(not to be confused with the 268:(not to be confused with the 1972:10.1016/j.marpol.2020.104043 1855:FiskDir. Skr. Ser. HauUnders 1347:Villanueva, R. (June 1993). 266:Mueller's bristle-mouth fish 1804:Prosch, R. M. (June 1991). 1120:Srisomwong, Jantra (2009). 388:on the ventral surface for 2398: 1507:10.1080/003648202753631721 1370:10.2989/025776193784287239 1326:10.2989/025776198784126214 690:The vertical migration of 261:, commonly referred to as 1823:10.2989/02577619109504635 1735:10.2989/02577619109504615 1575:Clarke, Thomas A (1982). 1543:10.1007/s00227-007-0727-8 1268:10.1016/j.dsr.2008.09.009 453:phototransduction cascade 366:Fresh-caught specimen of 235: 228: 130:Scientific classification 128: 106: 97: 88: 83: 1845:Gjøsæter, Jakob (1981). 1467:10.1578/am.42.4.2016.417 892:; Pauly, Daniel (eds.). 633:Hysterothylacium aduncum 306:Distribution and habitat 84:Mueller's pearlside 2024:10.1093/icesjms/fsaa114 1887:10.1139/cjfas-2015-0040 1689:10.1093/icesjms/fsab075 953:Journal of Fish Biology 794:Importance to Fisheries 681:diel vertical migration 671:Diel vertical migration 555:Enteroctopus magnificus 53:more precise citations. 2377:Fish described in 1789 1193:Stenella coerulaeoalba 997:10.1126/sciadv.aao4709 857:: e.T198760A21913754. 370: 359: 2313:Paleobiology Database 2048:"Maurolicus muelleri" 906:. March 2006 version. 365: 349: 732:copepod prey, which 506:are most important. 443:. Fish in the genus 313:is found across the 263:Mueller's pearlside, 2094:Maurolicus muelleri 1849:Maurolicus muelleri 1579:Maurolicus muelleri 1183:"Diets of Albacore, 896:Maurolicus muelleri 839:Maurolicus muelleri 780:Maurolicus muelleri 767:Maurolicus muelleri 677:Maurolicus muelleri 654:Sarcotretes scopeli 629:Scolex pleuronectis 607:Maurolicus muelleri 599:Maurolicus muelleri 589:plays a role as an 518:Maurolicus muelleri 421:Maurolicus muelleri 390:counterillumination 374:Maurolicus muelleri 368:Maurolicus muelleri 356:counterillumination 311:Maurolicus muelleri 258:Maurolicus muelleri 239:Maurolicus muelleri 100:Conservation status 2017:(7–8): 2541–2556. 1770:10.3354/meps170287 1430:10.3354/meps220277 1351:Octopus magnificus 1310:Todaropsis eblanae 1157:10.1007/BF00350086 1099:10.1007/bf00428663 715:hypothesis. Here, 549:Todaropsis eblanae 487:Euphausia pacifica 371: 360: 282:marine hatchetfish 2354: 2353: 2300:Open Tree of Life 2086:Taxon identifiers 1633:10.3354/meps09363 1411:Best, PB (2001). 1212:10.2960/j.v22.a10 1189:Delphinus delphis 921:. Paris: Unesco. 704:scattering layers 439:and bright-light 335:continental shelf 274:silvery lightfish 254: 253: 123: 79: 78: 71: 2389: 2347: 2346: 2334: 2333: 2321: 2320: 2308: 2307: 2295: 2294: 2282: 2281: 2269: 2268: 2256: 2255: 2253:NHMSYS0001745644 2243: 2242: 2230: 2229: 2217: 2216: 2204: 2203: 2191: 2190: 2178: 2177: 2165: 2164: 2152: 2151: 2139: 2138: 2126: 2125: 2113: 2112: 2111: 2081: 2062: 2060: 2058: 2039: 2038: 2036: 2026: 2001: 1995: 1994: 1984: 1974: 1950: 1944: 1943: 1915: 1909: 1908: 1898: 1869: 1863: 1862: 1842: 1836: 1835: 1825: 1801: 1792: 1791: 1781: 1753: 1747: 1746: 1718: 1712: 1711: 1701: 1691: 1682:(5): 1623–1635. 1667: 1656: 1655: 1645: 1635: 1611: 1598: 1597: 1585: 1572: 1555: 1554: 1525: 1519: 1518: 1490: 1479: 1478: 1449: 1443: 1442: 1432: 1408: 1402: 1401: 1389: 1383: 1382: 1372: 1344: 1338: 1337: 1301: 1295: 1294: 1286: 1280: 1279: 1250: 1244: 1243: 1236:Fishery Bulletin 1231: 1225: 1224: 1214: 1185:Thunnus alalunga 1178: 1169: 1168: 1140: 1134: 1133: 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Index

references
inline citations
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introducing
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Conservation status
Least Concern
IUCN 3.1
Scientific classification
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Eukaryota
Animalia
Chordata
Actinopterygii
Stomiiformes
Sternoptychidae
Maurolicus
Binomial name
J. F. Gmelin
Gonostomatidae
Phosichthyidae
marine hatchetfish
Maurolicus
Pacific Ocean
Atlantic Ocean
total length
Pacific
Atlantic Oceans
Mediterranean

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