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Trout cod

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in. Spawning of trout cod has never been observed in the wild and is not well understood. It is believed to be essentially the same as Murray cod but occurs about three weeks earlier and at significantly lower temperatures in waters shared by the two species. Trout cod are believed to spawn at temperatures as low as 15 degrees in upland rivers, using rocks as a spawning substrate; these are also clear adaptations to cool, rocky upland river habitats. Significantly, and unlike Murray cod, trout cod will not breed in earthen dam brood ponds; another indication that trout cod are a more specialised upland species than Murray cod. Artificial breeding programs being conducted for the species recovery use hormone injections to induce ovulation in naturally ripe fish in spring. Trout cod will hybridise with Murray cod and so for recovery projects it is important that Murray cod are not stocked into sites where Trout Cod and Murray cod are not already coexisting sympatrically.
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of blue nose , white eye and greasies . While he was at war, he even dreamt about fishing the Indi. When he came home he returned to his old job at Tom Groggin and announced that before he did any work, he wanted to go fishing. Very quickly he caught a fish about a foot (30cm) in length, the like of which he had never seen before. So intrigued was he by this strange spotted but nicely shaped fish that he immediately took it to the homestead thinking it was something quite unique. At the homestead, he was told it was a brown trout. From that time both the white eye and the blue nose numbers went into decline, while the numbers of brown and rainbow trout increased. To my mind, this man did do something remarkable, he had set a very positive timeframe of a change over of fish species in the Indi River.
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south-eastern Australia has been reserved in a trout-free state for larger upland native fish species. The effects of this course of action by fishery departments has been stark, and catastrophic events such as drought or bushfire, after which introduced trout species were restocked but upland native fish were not restocked, have shifted the balance further. The net result is that a number of upland native fish species including trout cod (and Macquarie perch) have completely died out or nearly so in their upland river habitats in the wild, apparently unable to cope with massive predation on their larvae/juveniles by introduced trout species and unable to cope with massive competition from introduced trout species for food and habitat at all life stages.
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frequently stocked into upland river habitats where introduced trout species were heavily entrenched, and in at least one case, were carried in conjunction with far larger stockings of introduced trout. A semi-natural population exists in a stretch of the very small upland Seven Creeks, which was established by translocations of trout cod (and Macquarie perch) above a set of falls in the 1920s. The Seven Creeks population is not a wholly artificial population, or a wholly unrepresentative habitat, as often claimed, as some of the trout cod translocated came — literally — from the base of the falls.
717:) over long time frames (i.e. decades) cannot be discounted however. Historical accounts such as those from J.O.Langtry indicate lowland trout cod populations were secondary populations in secondary habitats, clearly in the minority to more abundant primarily lowland native fish species such as Murray cod, golden perch and silver perch. Therefore, it is doubtful whether strong trout cod populations can ever be established in lowland habitats, and therefore the issue of upland habitats, and the return of some upland habitats in trout-free form, needs to be addressed in trout cod conservation. 27: 179: 223: 721:
one of its upland river habitats is an unresolved issue. Contrary to popular belief, many of these upland rivers still contain significant stretches of unregulated, high quality habitat. While dams, thermal pollution, siltation and other forms of habitat modification and degradation are responsible for the trout cod's extinction in many upland river habitats, it is almost certain that the reason for the trout cod's extinction in higher quality upland river habitats, that
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radio-tracked trout cod in the surviving Murray River population have small home ranges and may be a species which does not move away from their original base, except during the breeding season when they follow a common trend in Murray-Darling fish of migrating upstream prior to spawning. It seems likely that trout cod follow a similar pattern to Murray cod and return post spawning to their original location.
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Scientific studies to document and quantify the impacts of introduced trout on trout cod (and Macquarie perch) in upland river habitats, and develop a more scientific approach to trout cod conservation and re-establishment efforts, including in upland river habitats, are desperately needed. Given the
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I regret not knowing the name of a man I met at Tom Groggin Station, a Victorian property on the Indi River near Mt Kosciusko, who told me that he worked at Tom Groggin before he enlisted in the army and went to the first World War. He had fished the Indi before he left and it carried a great number
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as endangered due to overfishing, degradation of habitat and the introduction of invasive Trout species. The species is now totally protected. Only one wild, naturally occurring trout cod population remains in the Murray River in a region where the river is basically an extended transition zone from
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In the surviving Murray River population trout cod tend to stick to areas of deep water near banks, around snags, rocks or other large structure. However, historical accounts of trout cod in upland river habitats stated that trout cod were often found in shallow riffles and runs. Generally speaking,
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however they were also known as trout cod, and this common name was adopted when the species status of the fish was finally confirmed by genetic studies in the early 1970s. This choice of official common name was perhaps unfortunate; it has been suggested that bluenose cod is a more appropriate name
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Trout cod reach sexual maturity at 3 to 5 years (which corresponds to about 35 cm in males and 43 cm in females). Trout cod reach sexual maturity at a smaller size than Murray cod, which is an adaptation to the rocky, low nutrient and often quite small upland habitats trout cod were found
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While trout cod were only conclusively described as a separate species to Murray cod in 1972, commercial and recreational fishermen and early fishery biologists were in no doubt that there were two separate species of cod in the Murray-Darling system from the 1850s onwards, and noted the trout cod's
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Trout cod are a listed species on a number of different registers including Endangered under the New South Wales Fisheries Management Act 1994, the Australian Commonwealth's Environment Protection and Biodiversity Conservation Act 1999, the Australian Capital Territory's Nature Conservation Act 1980
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Historical evidence indicates trout cod (and Macquarie perch) were abundant in most of the larger upland rivers and streams in the south-east corner of the Murray-Darling river system, and that these upland river habitats were their primary habitats. The extinction of trout cod populations in every
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habitats. During the 19th and early 20th centuries trout cod were recognised by the scientific community as separate species, due to differing habitat preferences, morphological differences (especially the much smaller size at sexual maturity) and differing spawning times. It was really only post
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Trout cod are a small to medium groper-like fish with a deep, elongated body that is round in cross section. In contrast to Murray cod, trout cod have a pointed head with the top jaw overhanging the bottom jaw, and the slope of the head is straight. The eyes are slightly larger and more prominent
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Trueman WT (2007). Some recollections of native fish in the Murray-Darling system with special reference to the trout cod (Maccullochella macquariensis). Summary and source material for the draft publication ‘True Tales of the Trout Cod’. Native Fish Australia (Victoria) Incorporated, Doncaster,
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at Gundagai and Narranderra, although it is far from clear whether these populations will be self-sustaining in the long term. Many other stockings of trout cod have failed, which is not surprisingly considering the small number of trout cod fingerlings stocked, and the fact that trout cod were
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The spiny dorsal fin is moderate in height and is partially separated by a notch from the high, rounded soft dorsal fin. Soft dorsal, anal and caudal (tail) fins are all large and rounded, and are light grey to dark grey or black with distinct white edges. The large, rounded pectoral fins are
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Trout cod are cream to light grey on their ventral (“belly”) surfaces. Their back and flanks are most commonly bluish-grey in colour, overlain with irregular black speckling, but this can be highly variable depending on the habitat specimens come from, and can range from almost white to light
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Every single larger upland river and stream in south-eastern Australia is dominated by introduced trout species (rainbow trout and brown trout), with many having been continually stocked with introduced trout species for more than a century, and not a single larger upland river or stream in
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usually similar in colour to flanks. The pelvic fins are large and angular and set forward of the pectoral fins. The leading white-coloured rays on the pelvic fins split into two trailing white filaments, while the pelvic fins themselves are usually a translucent cream or light grey.
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In the 19th and early 20th centuries, when trout cod were widely recognised as a separate species by commercial fishermen, recreational fishermen, riverside residents and fisheries scientists, they were generally known as bluenose cod or simply bluenose, particularly in
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Douglas, J.W.& Brown, P. (2000). Notes on successful spawning and recruitment of a stocked population of the endangered Australian freshwater fish, trout cod, Maccullochella macquariensis (Cuvier) (Percichthyidae).
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species. Historical research is confirming a primarily upland distribution for trout cod; recent governmental literature lacking such historical research and suggesting trout cod are primarily a lowland fish species
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Trout cod are often found close to cover and in faster currents and in cooler waters than Murray cod. Their diet is essentially the same as Murray cod with adjustment made for size, eating mainly other fishes,
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In more lowland river habitats, river regulation and habitat degradation through activities like de-snagging, and overfishing, are probably the primary causes of decline. Heavy predation by introduced
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Trueman WT (2011). True Tales of the Trout Cod: River Histories of the Murray-Darling Basin. Publication No. 215/11. Murray-Darling Basin Authority, Canberra. Also available online at:
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strong cultural cringe towards introduced trout in the wider community and the management bias towards introduced trout amongst fishery agencies these studies may be some way off.
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Smaller trout cod tend to be more slender than equivalent sized Murray cod; curiously, very large trout cod appear to develop deeper shoulders than equivalent sized Murray cod.
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and water fowl. However, recent anecdotal evidence suggests terrestrial insects made up a significant proportion of the trout cod's diet in upland rivers and streams.
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Trout cod are carnivores and feed on other fish, crustaceans (such as crayfish, yabbies and freshwater shrimp) as well as aquatic and terrestrial insects. Larvae are
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species is a relatively common phenomena in native fish genera of the Murray-Darling and East Coast systems with other notable pairs shown in the following table:
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experienced serious modification and degradation, is the heavy domination of these habitats by introduced trout species, which are aggressive, predatory fish.
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sister species to Murray cod. Therefore, the trout cod's main habitats were the larger upland rivers and creeks, which they usually co-inhabited with
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Trout cod have been reliably recorded to at least 80 cm and 16 kg, but there are some credible anecdotal accounts of larger specimens.
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Two small populations of trout cod that have shown indications of breeding have been created by hatchery stockings in the lowland reaches of
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Cadwallader, P.L. & Gooley, G. (1984) Past and present distributions and translocations of Murray cod and trout cod in Victoria.
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and by the World Conservation Union (IUCN). They are also listed as Threatened under the Victorian Flora and Fauna Guarantee Act 1998.
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Butcher, A.D. (1945) The food of indigenous and non-indigenous freshwater fish in Victoria, with special reference to trout.
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as the name trout cod causes confusion amongst the Australian public. (Trout cod are an Australian native freshwater fish; they
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than in Murray cod. The head tends to be free of speckling however a distinct dark stripe through the eye is usually present.
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Trout cod are broadly similar to the Murray cod, however there are some distinct differences in morphology and colouration.
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grey-green, light brown, dark brown or almost black. The black speckling on the back and flanks is consistent however.
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Cadwallader, P.L. (1979) Distribution of native and introduced fish in the Seven Creeks river system, Victoria.
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Although there is/was a very substantial overlap in range, trout cod are essentially a more specialised
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https://web.archive.org/web/20130807212235/http://australianriverrestorationcentre.com.au/mdb/troutcod/
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Trout cod were once common and abundant throughout the Murray-Darling Basin but are now listed on the
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different appearance and spawning biology and preference for cooler, faster flowing water and
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Cadwallader, P.L. (ed.) (1977) J.O. Langtry's 1949–50 Murray River Investigations.
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Couch, Alan J.; Unmack, Peter J.; Dyer, Fiona J.; Lintermans, Mark (27 October 2016).
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epoch (from about 23.03 to 5.332 million years ago) to recent age, while the species
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Butcher, A.D. (1967) A changing aquatic fauna in a changing environment.
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https://www.nativefish.asn.au/userfiles/files/Recollections_compressed.pdf
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Recovery Plan for the Trout Cod Maccullochella Macquariensis 1998 - 2005
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Australian Government Department of the Environment and Heritage -
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Heads and Tales: Recollections of a Fisheries and Wildlife Officer.
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Heads and Tales: Recollections of a Fisheries and Wildlife Officer.
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Koehn, J.; Lintermans, M.; Lieschke, J.; Gilligan, D. (2019).
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a hybrid between Murray cod and introduced trout species.)
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Trueman, W. and Luker, C. (1992) Fishing Yesteryear.
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The Australian Deer Research Foundation Ltd, Melbourne.
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Australian Freshwater Fishes; Biology and Management.
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(1984) 196: 177: 885: 867: 826:"Trout Cod, Maccullochella macquariensis" 796: 71:Learn how and when to remove this message 1092:, "le growler de la rivière Macquarie", 823: 819: 817: 815: 444: 34:This article includes a list of general 926: 913:Integrated Taxonomic Information System 1338: 1115: 1114: 1019:Freshwater Fishing Australia Magazine 812: 969:Ministry for Conservation, Victoria. 425:, but is now an endangered species. 20: 784:IUCN Red List of Threatened Species 13: 40:it lacks sufficient corresponding 14: 1387: 1371:Extant Pliocene first appearances 1041: 824:Bray, Dianne; Thompson, Vanessa. 630:Mountain galaxias species complex 1356:Fish of the Murray-Darling basin 1346:IUCN Red List vulnerable species 1079:Sepkoski's Online Genus Database 221: 102: 25: 1098:Histoire naturelle des poissons 1028:Victoria. Available online at: 695: 686: 909:"Maccullochella macquariensis" 843: 480: 1: 1361:Endangered fauna of Australia 1107:in Griffith & Smith 1834. 974:Australian Journal of Ecology 967:Fisheries and Wildlife Paper. 957:IUCN Publications, New Series 759: 477:(3.6–5.3 mya) to recent age. 1366:Taxa named by Georges Cuvier 1154:Maccullochella_macquariensis 1125:Maccullochella macquariensis 934:Maccullochella macquariensis 777:Maccullochella macquariensis 471:Maccullochella macquariensis 451:Maccullochella macquariensis 396:Maccullochella macquariensis 327:Maccullochella macquariensis 7: 1103:Illustrations: figure 2 of 1096:in Cuvier and Valenciennes 1061:Australian Museum Fish Site 715:source and sink populations 453:, Lower Pliocene, Australia 10: 1392: 541:be considered inaccurate. 519: 1123: 1007:Griffin Press, Australia. 544:Division into specialist 413:, closely related to the 349: 342: 323: 316: 218:Scientific classification 216: 194: 185: 176: 87: 1088:Description (in French) 930:; Pauly, Daniel (eds.). 944:. October 2005 version. 674: 594:Macquaria novemaculeata 532:and one or both of the 55:more precise citations. 1376:Fish described in 1829 1047:Native Fish Australia 1010:Rhodes, J.O. (1999) 791:: e.T12574A123378211. 745: 574:Macquaria australasica 473:is present from Lower 454: 1090:Grystes Macquariensis 1084:Paleobiology Database 731: 683:and eat zooplankton. 448: 353:Grystes macquariensis 309:M. macquariensis 1059:Australian Museum - 950:Fisheries Pamphlet 2 610:Two-spined blackfish 433:. In some parts of 830:Fishes of Australia 623:Gadopsis marmoratus 614:Gadopsis bispinosis 603:Macquaria colonorum 380:W. J. Macleay, 1885 188:Conservation status 869:10.7717/peerj.2593 753:Murrumbidgee River 653:freshwater mussels 643:Galaxias rostratus 465:can be found from 455: 377:Oligorus gibbiceps 369:Oligorus mitchelii 1333: 1332: 1292:Open Tree of Life 1117:Taxon identifiers 1067:cod recovery plan 648: 647: 639:Flathead galaxias 583:Macquaria ambigua 461:Fossils of genus 387: 386: 381: 373: 365: 357: 211: 81: 80: 73: 1383: 1326: 1325: 1313: 1312: 1300: 1299: 1287: 1286: 1274: 1273: 1261: 1260: 1248: 1247: 1235: 1234: 1222: 1221: 1209: 1208: 1196: 1195: 1183: 1182: 1170: 1169: 1157: 1156: 1144: 1143: 1142: 1112: 1111: 945: 923: 921: 919: 900: 899: 889: 871: 847: 841: 840: 838: 836: 821: 810: 809: 807: 805: 800: 770: 558: 557: 421:river system in 379: 371: 363: 361:Grystes brisbani 355: 329: 226: 225: 205: 200: 199: 181: 171: 101: 91:Temporal range: 85: 84: 76: 69: 65: 62: 56: 51:this article by 42:inline citations 29: 28: 21: 1391: 1390: 1386: 1385: 1384: 1382: 1381: 1380: 1336: 1335: 1334: 1329: 1321: 1316: 1308: 1303: 1295: 1290: 1282: 1277: 1269: 1264: 1256: 1251: 1243: 1238: 1230: 1225: 1217: 1212: 1204: 1199: 1191: 1186: 1178: 1173: 1165: 1160: 1152: 1147: 1138: 1137: 1132: 1119: 1077:Sepkoski, Jack 1044: 917: 915: 907: 904: 903: 848: 844: 834: 832: 822: 813: 803: 801: 771: 767: 762: 698: 689: 677: 619:River blackfish 590:Australian bass 570:Macquarie perch 530:Macquarie perch 522: 483: 435:New South Wales 409:and the family 372:Castelnau, 1873 356:G. Cuvier, 1829 338: 331: 325: 312: 220: 212: 201: 197: 190: 172: 170: 169: 168: 167: 162: 157: 152: 147: 142: 137: 132: 127: 122: 117: 112: 107: 93: 92: 89: 77: 66: 60: 57: 47:Please help to 46: 30: 26: 17: 16:Species of fish 12: 11: 5: 1389: 1379: 1378: 1373: 1368: 1363: 1358: 1353: 1351:Maccullochella 1348: 1331: 1330: 1328: 1327: 1314: 1301: 1288: 1275: 1262: 1249: 1236: 1223: 1210: 1197: 1184: 1171: 1158: 1145: 1129: 1127: 1121: 1120: 1109: 1108: 1101: 1086: 1081: 1075: 1069: 1063: 1057: 1051: 1049:Trout cod page 1043: 1042:External links 1040: 1039: 1038: 1032: 1025: 1015: 1008: 1001: 990: 980: 970: 963: 953: 946: 928:Froese, Rainer 924: 902: 901: 842: 811: 764: 763: 761: 758: 697: 694: 688: 685: 676: 673: 646: 645: 636: 626: 625: 616: 606: 605: 596: 586: 585: 576: 566: 565: 562: 521: 518: 482: 479: 463:Maccullochella 419:Murray-Darling 411:Percichthyidae 406:Maccullochella 385: 384: 383: 382: 374: 366: 358: 347: 346: 340: 339: 332: 321: 320: 314: 313: 306: 304: 300: 299: 296:Maccullochella 292: 288: 287: 285:Percichthyidae 282: 278: 277: 272: 268: 267: 265:Actinopterygii 262: 258: 257: 252: 248: 247: 242: 238: 237: 232: 228: 227: 214: 213: 195: 192: 191: 186: 183: 182: 174: 173: 165: 164: 163: 158: 153: 148: 143: 138: 133: 128: 123: 118: 113: 108: 103: 90: 79: 78: 33: 31: 24: 15: 9: 6: 4: 3: 2: 1388: 1377: 1374: 1372: 1369: 1367: 1364: 1362: 1359: 1357: 1354: 1352: 1349: 1347: 1344: 1343: 1341: 1324: 1319: 1315: 1311: 1306: 1302: 1298: 1293: 1289: 1285: 1280: 1276: 1272: 1267: 1263: 1259: 1254: 1250: 1246: 1241: 1237: 1233: 1228: 1224: 1220: 1215: 1211: 1207: 1202: 1198: 1194: 1189: 1185: 1181: 1176: 1172: 1168: 1163: 1159: 1155: 1150: 1146: 1141: 1135: 1131: 1130: 1128: 1126: 1122: 1118: 1113: 1106: 1102: 1099: 1095: 1091: 1087: 1085: 1082: 1080: 1076: 1074: 1070: 1068: 1064: 1062: 1058: 1056: 1052: 1050: 1046: 1045: 1037: 1033: 1031: 1026: 1023: 1020: 1016: 1013: 1009: 1006: 1002: 999: 996: 991: 988: 985: 981: 978: 975: 971: 968: 964: 961: 958: 954: 951: 947: 943: 942: 937: 935: 929: 925: 914: 910: 906: 905: 897: 893: 888: 883: 879: 875: 870: 865: 861: 857: 853: 846: 831: 827: 820: 818: 816: 799: 794: 790: 786: 785: 780: 778: 769: 765: 757: 754: 749: 744: 743: 742: 737: 736: 730: 726: 724: 718: 716: 712: 706: 703: 693: 684: 682: 672: 668: 666: 662: 658: 654: 644: 640: 637: 635: 634:Galaxias spp. 631: 628: 627: 624: 620: 617: 615: 611: 608: 607: 604: 600: 599:Estuary perch 597: 595: 591: 588: 587: 584: 580: 577: 575: 571: 568: 567: 563: 560: 559: 556: 554: 551: 547: 542: 540: 535: 531: 527: 517: 515: 510: 504: 501: 497: 493: 489: 486: 478: 476: 472: 468: 464: 459: 452: 447: 443: 441: 436: 432: 426: 424: 420: 416: 412: 408: 407: 402: 398: 397: 392: 378: 375: 370: 367: 362: 359: 354: 351: 350: 348: 345: 341: 336: 330: 328: 322: 319: 318:Binomial name 315: 311: 310: 305: 302: 301: 298: 297: 293: 290: 289: 286: 283: 280: 279: 276: 273: 270: 269: 266: 263: 260: 259: 256: 253: 250: 249: 246: 243: 240: 239: 236: 233: 230: 229: 224: 219: 215: 209: 204: 193: 189: 184: 180: 175: 161: 156: 151: 146: 141: 136: 131: 126: 121: 116: 111: 106: 100: 96: 86: 83: 75: 72: 64: 54: 50: 44: 43: 37: 32: 23: 22: 19: 1124: 1097: 1089: 1073:cod fishnote 1021: 1018: 1011: 1004: 997: 994: 986: 983: 976: 973: 966: 959: 956: 949: 939: 933: 916:. 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Cuvier 303:Species: 241:Kingdom: 235:Eukaryota 88:Trout cod 1245:10150504 1201:FishBase 1140:Q2711806 1134:Wikidata 1105:plate 12 1000:143-147. 979:361–385. 962:197–218. 941:FishBase 918:19 March 896:27812407 723:have not 663:, small 564:Lowland 475:Pliocene 431:Victoria 344:Synonyms 281:Family: 255:Chordata 251:Phylum: 245:Animalia 231:Domain: 208:IUCN 3.1 95:Pliocene 61:May 2020 1219:2380475 887:5088581 665:mammals 661:insects 561:Upland 553:lowland 520:Habitat 467:Miocene 440:are not 337:, 1829) 291:Genus: 271:Order: 261:Class: 206: ( 166:↓ 49:improve 1323:991272 1297:538651 1284:135760 1258:641893 1193:994524 1167:148298 1024:34–38. 989:33–43. 894:  884:  876:  546:upland 526:upland 509:upland 99:Recent 38:, but 1318:WoRMS 1310:26171 1305:SPRAT 1271:12574 1240:IRMNG 1232:85287 1180:6R2GH 1094:p. 58 856:PeerJ 399:) or 1279:NCBI 1266:IUCN 1253:ITIS 1214:GBIF 1206:6308 1162:BOLD 998:122: 920:2006 892:PMID 874:ISSN 837:2014 806:2021 789:2019 702:IUCN 675:Diet 548:and 539:must 389:The 105:PreꞒ 1188:EoL 1175:CoL 1149:AFD 1022:17: 987:96: 882:PMC 864:doi 793:doi 1342:: 1320:: 1307:: 1294:: 1281:: 1268:: 1255:: 1242:: 1229:: 1216:: 1203:: 1190:: 1177:: 1164:: 1151:: 1136:: 977:4: 960:9: 938:. 911:. 890:. 880:. 872:. 858:. 854:. 828:. 814:^ 787:. 781:. 655:, 641:, 632:, 621:, 612:, 601:, 592:, 581:, 572:, 155:Pg 97:- 936:" 932:" 922:. 898:. 866:: 860:4 839:. 808:. 795:: 779:" 775:" 393:( 333:( 210:) 160:N 150:K 145:J 140:T 135:P 130:C 125:D 120:S 115:O 110:Ꞓ 74:) 68:( 63:) 59:( 45:.

Index

references
inline citations
improve
introducing
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Pliocene
Recent
PreꞒ

O
S
D
C
P
T
J
K
Pg
N

Conservation status
Vulnerable
IUCN 3.1
Scientific classification
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Eukaryota
Animalia
Chordata
Actinopterygii
Perciformes

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