Knowledge (XXG)

Common galaxias

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756: 75: 477:("spotted") comes from the pattern of dark-mottled, leopard-like spots on an olive-brown background along their upper bodies. This pattern ranges from very subtle to quite bold. Common galaxias have slightly forked tails, unlike other most other galaxiids, which have square tails. Adults typically range from 8–11 cm (3.1–4.3 in) in length, with an average of 10 cm (4 in). The maximum reported length 19 cm (7.5 in). 639: 50: 559: 31: 795:
produce no eggs or larvae, a gap is created during marine dispersal. No opportunities exist for the exchange of larvae from these sink populations with other populations. However, these sink populations can receive larvae that were born in different rivers. They will not be able to successfully reproduce and the sink cycle continues.
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are produced and that each river is a source of larvae. Exclusion of livestock and fencing of the bank-side vegetation is also an effective method to encourage regrowth of suitable vegetation. Restoration of the spawning habitat helps to maintain connectivity between larvae from different rivers during marine dispersal.
543:, they can jump out of the water (emerse) and take up oxygen through their skin as a last resort. They need access to riparian vegetation for spawning, and usually live in river systems with access to the sea, as their larval stage is marine. They tend to be found in lower-elevation streams as unlike other species of 794:
In parts of New Zealand, this species spawning habitat has become degraded due to activities related to agriculture, urbanisation, and land use change. This creates sink populations in rivers as adult fish have nowhere suitable to lay their eggs and the majority of eggs die. Because these sink rivers
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Galaxiid species are, in general, threatened by human activities such as intensive agriculture and land change use. These activities have removed vegetation from stream banks that are needed for spawning to protect eggs from the sun. The increased nutrient input into streams from farming can lead to
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Innovative methods to restore the riparian spawning habitat include using straw bales as a temporary replacement for vegetation. Straw bales provide the same conditions and physical structure as natural vegetation, enabling the eggs to develop successfully. This method ensures that eggs and larvae
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while moving upstream and are much valued as a delicacy, leading to their protection with controlled fishing seasons to preserve adult populations. They are fished commercially in New Zealand, Chile, and Argentina, but the last Australian commercial fishery closed in Tasmania in the 1970s.
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are swept out to sea and spend 3–6 months in the marine environment. This phase of their lifecycle is little understood, as the larvae are small, transparent, and difficult to locate. The speed and direction of ocean currents play an important role in their dispersal; temperature and food
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Eggs (about 1 mm diameter) develop at the base of vegetation for 2–4 weeks. Environmental conditions in the vegetation (particularly temperature and humidity) are critical for successful egg development. Egg mortality occurs from excess exposure to sunlight,
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availability are also important in determining how long they spend at sea. This marine dispersal phase is a critical part of the common galaxias's lifecycle, because it gives larvae from different populations or rivers the opportunity to 'connect'.
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Urbina M.A, Foster M.E, Glover C.N. 2011. Leap of faith: Voluntary emersion behaviour and physiological adaptations to aerial exposure in a non-aestivating freshwater fish in response to aquatic hypoxia. Physiology and Behavior 103,
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Following metamorphosis, adult spend around 6 months in fresh water, where they gain sufficient growth and energy to begin investing in reproduction. Males generally reach sexual maturity earlier and at a smaller size than females.
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Adults are mainly found in still or slow-moving water in the lower parts of coastal streams and rivers, or around the edges of lagoons; they can tolerate a wide range of natural conditions. If oxygen levels are low as a result of
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are sufficiently grown, about 30–55 mm in length, they migrate back into fresh water. The juveniles form large shoals as they move through estuaries. Some of their life is spent in the lower reaches of rivers, where they
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Some jurisdictions permit fishing of the adults, but again under regulation or licence to preserve the adult population, but others ban it altogether unless the fisher belongs to an indigenous people (e.g., New Zealand
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Stevens, J. C. B.; Hickford, M. J. H.; Schiel, D. R. (2016-10-01). "Evidence of iteroparity in the widely distributed diadromous fish inanga Galaxias maculatus and potential implications for reproductive output".
609:. Eggs remain attached to the vegetation as the tide recedes. Two types of reproductive strategy occur: the most common is a 'boom bust' strategy whereby spawning occurs in one event and is followed by death ( 469:
Common galaxias have iridescent silver eyes, undersides, and gill covers, and some have an iridescent green stripe along the top of their bodies which can be intermittently seen as they swim. Their
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from mice and spiders, grazing and trampling by livestock, mowing of bankside vegetation in urban areas, and flooding. The following spring tide floods the eggs stimulating them to hatch.
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Hickford, Michael J.H.; Schiel, David R. (2016). "Otolith microchemistry of the amphidromous Galaxias maculatus shows recruitment to coastal rivers from unstructured larval pools".
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Hickford, Michael J. H.; Schiel, David R. (2013-11-01). "Artificial Spawning Habitats Improve Egg Production of a Declining Diadromous Fish, Galaxias maculatus (Jenyns, 1842)".
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Adult fish typically reach sexual maturity at one year and spawning is triggered by changes in day length and temperature. Unless landlocked within a lake, the common galaxias
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Urbina M.A, Glover C.N., Foster M.E. 2012. A novel oxyconforming response in the freshwater fish Galaxias maculatus. Comparative Biochemistry and Physiology A 161, 301- 06.
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include cowfish, jollytail, common jollytail, eel gudgeon, inaka, native trout, pulangi, puye, slippery tarki, spotted minnow, Falklands minnow and whitebait.
1838: 453:. It is a slim, narrow fish with a forked tail and a mottled, spotty pattern, typically about 10 cm (4 in) long when fully grown. It lives in 1696: 1853: 1735: 1443: 1212:"Synergistic interactions within disturbed habitats between temperature, relative humidity and UVB radiation on egg survival in a diadromous fish" 1530: 882:. Copies available from D.E. McAllister, Canadian Museum of Nature, P.O. Box 3443, Ottawa, Ontario K1P 6P4, Canada. 2661 p. plus 1270 p. Index. 1863: 1848: 1784: 993: 961: 1547: 550:
Common galaxias can become land-locked (such as in five lakes in Northland, New Zealand), feeding and breeding in large beds of reeds.
1858: 1108: 1321:"Otolith microchemistry of the amphidromous Galaxias maculatus shows recruitment to coastal rivers from unstructured larval pools" 1016: 1810: 295: 275: 265: 255: 1740: 1439: 747:). For instance, in Tasmania, the adult common galaxias may only be caught using a pole of a specified maximum size (1 m). 667:, before spending their adult life in suitable freshwater habitat. Some individuals return to the river they were born in ( 590:
in the tidally influenced reaches of rivers and streams but spawning in winter and spring has occurred. The eggs are laid
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eutrophication. In New Zealand, their conservation status is declining, mostly because of habitat loss and degradation.
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Bice, C.; Raadik, T.; David, B.; West, D.; Franklin, P.; Allibone, R.; Ling, N.; Hitchmough, R.; Crow, S. (2019).
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https://web.archive.org/web/20081015114538/http://www.niwascience.co.nz/rc/freshwater/fishatlas/species/inanga
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Common galaxias are one of the most widely distributed freshwater fish in the world. They inhabit
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McDowall, Robert (2007). "On amphidromy, a distinct form of diadromy in aquatic organisms".
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meaning that reproduction occurs in fresh water and larval growth occurs in the sea.
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Common galaxias video on Youtube showing young fish trying to negotiate a barrier
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and numerous waterfilled cenotes and caves in south-eastern South Australia.
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or shoals in slow-moving water, but can be more solitary in swifter streams.
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Etchegoin, Jorge A.; Cremonte, Florencia & Escalante, Alicia H. (2002):
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The milky white colour of the water is from male sperm following spawning.
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Diadromy in fishes: Migrations between marine and freshwater environments
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has been reported from this species' Argentinian population. These are
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New Zealand ecology – Native freshwater galaxiid fish, Inanga
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Paxton, J.R., D.F. Hoese, G.R. Allen and J.E. Hanley (1989)
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New Zealand Freshwater Fishes: A Natural History and Guide
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Hickford, Michael J. H.; Schiel, David R. (2016-04-21).
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A Photographic Guide to Freshwater FIshes of New Zealand
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into the water and the eggs are fertilised externally.
939:. T.F.H. Publications, Inc., Neptune City, New Jersey. 1565: 1461:n. sp. (Digenea: Zoogonidae) from the relict fish 956:. New Zealand: Wet Sock Publications. p. 31. 1210:Hickford, Michael.J.H.; Schiel, David.R. (2011). 841:10.2305/IUCN.UK.2019-3.RLTS.T197279A129040788.en 1094: 1092: 1090: 598:vegetation by females. Male fish then release 8: 918: 916: 914: 912: 910: 908: 906: 904: 902: 900: 898: 896: 894: 892: 890: 888: 874: 872: 870: 868: 866: 864: 862: 860: 858: 1553: 1007: 1005: 954:The New Zealand Native Freshwater Aquarium 48: 29: 20: 1465:(Osteichthyes: Characidae) in Argentina. 1245: 1235: 839: 710:) of the common galaxias. Similarly, the 1459:Steganoderma (Steganoderma) valchetensis 1444:Integrated Taxonomic Information System 808: 782:. This is the same diet as introduced 1373:"Common Galaxias, Galaxias maculatus" 988:. Auckland: New Holland. p. 37. 924:Pisces. Petromyzontidae to Carangidae 880:A working list of fishes of the world 7: 1777:882c22d0-2676-4b38-a919-c8cb4c6c609b 979: 977: 975: 973: 947: 945: 1839:IUCN Red List least concern species 827:IUCN Red List of Threatened Species 566:This species is usually considered 547:they cannot climb past waterfalls. 520:, coastal streams in south-eastern 14: 480:They are commonly found in small 1081:10.1111/j.1467-2979.2007.00232.x 605:This type of spawning is called 73: 770:As adults, common galaxias eat 1854:Freshwater fish of New Zealand 1325:Marine Ecology Progress Series 1286:Marine Ecology Progress Series 937:Freshwater fishes of Australia 650:After hatching, the 7-mm-long 1: 1371:Gomon, Martin; Bray, Dianne. 1864:Freshwater fish of Argentina 1849:Freshwater fish of Australia 1237:10.1371/journal.pone.0024318 1103:. Auckland: Heinemann Reed. 734:The juveniles are caught as 1880: 1539:TerraNature, Auckland 2010 1269:McDowall, Robert (1988). 759:Inanga on the drawing of 201: 194: 175: 168: 70:Scientific classification 68: 46: 37: 28: 23: 1859:Freshwater fish of Chile 1505:Juvenile Common Galaxias 1133:Science for Conservation 1029:. February 2017 version. 1015:; Pauly, Daniel (eds.). 984:McQueen, Stella (2013). 952:McQueen, Stella (2010). 878:McAllister, D.E. (1990) 586:mainly in autumn during 488:Distribution and habitat 1479:10.1023/A:1014098732668 1467:Systematic Parasitology 1161:Journal of Fish Biology 1099:McDowall, R.M. (1990). 834:: e.T197279A129040788. 570:, a particular type of 445:) is a very widespread 763: 696:Limnoderetrema minutum 647: 563: 1526:Native Fish Australia 1516:Common Galaxias video 1463:Gymnocharacinus bergi 1273:. London: Croom Helm. 1124:Taylor, M.J. (2002). 758: 641: 561: 323:Galaxias pseudoscriba 1440:"Galaxias maculatus" 716:Steganoderma szidati 365:Galaxias punctulatus 309:Galaxias waterhousei 302:Galaxias waterhousei 262:Galaxias delicatulus 252:Galaxias cylindricus 1544:Critter of the Week 1411:2013ResEc..21..686H 1399:Restoration Ecology 1377:Fishes of Australia 1337:2016MEPS..548..197H 1298:2016MEPS..548..197H 1228:2011PLoSO...624318H 1173:2016JFBio..89.1931S 1073:2007AqFF....8....1M 935:Allen, G.R. (1989) 761:Frank Edward Clarke 712:intestinal parasite 691:Deretrema philippae 449:fish in the family 447:Southern Hemisphere 351:Mesites gracillimus 316:Galaxias waterhousi 292:Galaxias versicolor 245:Galaxias coppingeri 228:Galaxias variegatus 40:Conservation status 1637:galaxias-maculatus 1624:Galaxias_maculatus 1611:Galaxias_maculatus 1597:Galaxias maculatus 1567:Galaxias maculatus 1542:Inanga on RadioNZ 1061:Fish and Fisheries 1019:Galaxias maculatus 820:Galaxias maculatus 764: 648: 564: 431:Galaxias maculatus 410:Mesites attenuatus 375:Valenciennes, 1846 344:Galaxias punctatus 214:Galaxias maculatus 179:Galaxias maculatus 1826: 1825: 1798:Open Tree of Life 1559:Taxon identifiers 1481: 1419:10.1111/rec.12008 1345:10.3354/meps11701 1306:10.3354/meps11701 1181:10.1111/jfb.13083 995:978-1-86966-386-5 963:978-0-473-17935-9 533:Western Australia 422: 421: 417: 407: 396: 386: 379:Mesites maculatus 376: 369: 362: 355: 348: 341: 337:Galaxias krefftii 334: 327: 320: 313: 306: 299: 289: 279: 269: 259: 249: 242: 238:Galaxias nebulosa 235: 225: 221:Galaxias parrishi 218: 211: 204:Galaxias usitatus 161:G. maculatus 63: 1871: 1819: 1818: 1806: 1805: 1793: 1792: 1780: 1779: 1770: 1769: 1757: 1756: 1744: 1743: 1731: 1730: 1718: 1717: 1705: 1704: 1692: 1691: 1679: 1678: 1666: 1665: 1653: 1652: 1640: 1639: 1627: 1626: 1614: 1613: 1601: 1600: 1599: 1586: 1585: 1584: 1554: 1517: 1506: 1495: 1473: 1454: 1452: 1450: 1431: 1430: 1394: 1388: 1387: 1385: 1383: 1368: 1362: 1355: 1349: 1348: 1316: 1310: 1309: 1281: 1275: 1274: 1266: 1260: 1259: 1249: 1239: 1207: 1201: 1200: 1167:(4): 1931–1946. 1155: 1149: 1148: 1146: 1144: 1130: 1121: 1115: 1114: 1096: 1085: 1084: 1056: 1050: 1046: 1040: 1037: 1031: 1030: 1009: 1000: 999: 981: 968: 967: 949: 940: 933: 927: 920: 883: 876: 853: 852: 850: 848: 843: 813: 688:In New Zealand, 642:A newly hatched 594:amongst flooded 506:Falkland Islands 459:vernacular names 412: 401: 399:Galaxias alpinus 391: 381: 374: 367: 360: 358:Galaxias minutus 354:Canestrini, 1864 353: 346: 339: 332: 330:Mesites forsteri 325: 318: 311: 304: 294: 284: 282:Galaxias obtusus 274: 272:Galaxias amaenus 264: 254: 247: 240: 230: 223: 216: 206: 181: 78: 77: 57: 52: 51: 33: 24:Common galaxias 21: 1879: 1878: 1874: 1873: 1872: 1870: 1869: 1868: 1829: 1828: 1827: 1822: 1814: 1809: 1801: 1796: 1788: 1783: 1775: 1773: 1765: 1760: 1752: 1747: 1739: 1734: 1726: 1721: 1713: 1708: 1700: 1695: 1687: 1682: 1674: 1669: 1661: 1656: 1648: 1643: 1635: 1630: 1622: 1617: 1609: 1604: 1595: 1594: 1589: 1580: 1579: 1574: 1561: 1515: 1504: 1493: 1489: 1482:(HTML abstract) 1448: 1446: 1438: 1435: 1434: 1396: 1395: 1391: 1381: 1379: 1370: 1369: 1365: 1356: 1352: 1318: 1317: 1313: 1283: 1282: 1278: 1268: 1267: 1263: 1209: 1208: 1204: 1157: 1156: 1152: 1142: 1140: 1128: 1123: 1122: 1118: 1111: 1098: 1097: 1088: 1058: 1057: 1053: 1047: 1043: 1038: 1034: 1011: 1010: 1003: 996: 983: 982: 971: 964: 951: 950: 943: 934: 930: 921: 886: 877: 856: 846: 844: 815: 814: 810: 805: 792: 753: 732: 686: 677: 675:Freshwater life 636: 623: 621:Egg development 580: 556: 510:Pacific Islands 490: 467: 426:common galaxias 408: 397: 389:Mesites alpinus 387: 377: 372:Galaxias scriba 370: 363: 356: 349: 342: 335: 328: 321: 314: 307: 300: 290: 280: 270: 260: 250: 243: 236: 226: 219: 212: 190: 183: 177: 164: 72: 64: 53: 49: 42: 17: 16:Species of fish 12: 11: 5: 1877: 1875: 1867: 1866: 1861: 1856: 1851: 1846: 1841: 1831: 1830: 1824: 1823: 1821: 1820: 1807: 1794: 1781: 1771: 1758: 1745: 1732: 1719: 1706: 1693: 1680: 1667: 1654: 1641: 1628: 1615: 1602: 1587: 1571: 1569: 1563: 1562: 1557: 1551: 1550: 1540: 1534: 1533:NIWA June 2006 1528: 1523: 1512: 1501: 1488: 1487:External links 1485: 1484: 1483: 1472:(2): 149–153. 1455: 1433: 1432: 1405:(6): 686–694. 1389: 1363: 1350: 1311: 1276: 1261: 1202: 1150: 1116: 1109: 1086: 1051: 1041: 1032: 1013:Froese, Rainer 1001: 994: 969: 962: 941: 928: 884: 854: 807: 806: 804: 801: 791: 788: 752: 749: 731: 728: 706:(and possibly 698:) is known to 685: 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Index

Long thin fish with many small spots
Conservation status
Least Concern
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Actinopterygii
Galaxiiformes
Galaxiidae
Galaxias
Binomial name
Jenyns
Synonyms
McDowall
Lahille
Castelnau
Castelnau
Castelnau
Klunzinger
Castelnau
Jenyns
Jenyns
Jenyns
Jenyns
Māori
Southern Hemisphere
Galaxiidae

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