{"id":53226,"date":"2025-10-27T16:23:37","date_gmt":"2025-10-27T16:23:37","guid":{"rendered":"https:\/\/site.itshrt.com\/worldnews\/a-freshwater-fish-named-arnie-just-swam-a-record-530-miles-mostly-upstream-australian-scientists-say\/"},"modified":"2025-10-27T16:23:37","modified_gmt":"2025-10-27T16:23:37","slug":"a-freshwater-fish-named-arnie-just-swam-a-record-530-miles-mostly-upstream-australian-scientists-say","status":"publish","type":"post","link":"https:\/\/site.itshrt.com\/worldnews\/a-freshwater-fish-named-arnie-just-swam-a-record-530-miles-mostly-upstream-australian-scientists-say\/","title":{"rendered":"A freshwater fish named Arnie just swam a record 530 miles, mostly upstream, Australian scientists say"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6606220950177433\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- ItShrt World News -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-6606220950177433\"\r\n     data-ad-slot=\"1882483372\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\r\n<br \/>\n<\/p>\n<div id=\"\">\n<p>An Australian freshwater Murray cod has surprised scientists by swimming a marathon 530 miles along a major river system, believed to be a record for the species.<\/p>\n<p>The fish, named Arnie after Australia&#8217;s recently retired Olympic champion <span class=\"link\"><a href=\"https:\/\/www.cbsnews.com\/news\/ariarne-titmus-wins-gold-over-katie-ledecky-in-400-meter-freestyle\/\" data-invalid-url-rewritten-http=\"\">Ariarne Titmus<\/a><\/span>, was first tagged in early 2022 in Mullaroo Creek, about a 13-hour drive west of Sydney, said <a href=\"https:\/\/www.ari.vic.gov.au\/\" target=\"_blank\" rel=\"nofollow noopener\">Arthur Rylah Institute<\/a> researcher Zeb Tonkin.<\/p>\n<p>Four years old and weighing in at 3.7 pounds at the time, it &#8220;took off&#8221; when floods hit the area in the spring of that year, Tonkin said, traveling an initial 470 miles upstream in fewer than two months.<\/p>\n<p>The scaly river dweller, an apex water predator, was able to cover longer distances because barriers had been removed along the Murray River to let flood waters pass through.<\/p>\n<p>&#8220;It basically provided free passage for fish,&#8221; said Tonkin.<\/p>\n<p>Arnie then turned around at some point in the past 12 months, swimming another 60 miles downstream towards home.<\/p>\n<p>Researchers only discovered the extent of the fish&#8217;s travels when sharing data with colleagues a couple of weeks ago.<\/p>\n<p>&#8220;We&#8217;ve been working on these species for decades&#8230; and we haven&#8217;t come across that sort of scale of movement beforehand,&#8221; Tonkin said. &#8220;Probably the best we have seen a Murray cod do is around 160 kilometers (100 miles).&#8221;<\/p>\n<p>Understanding Murray cod allows researchers to adapt water flows to protect their environment, said Tonkin, whose institute is part of the state of Victoria&#8217;s department of energy, environment and climate action.<\/p>\n<p>The fish \u2014 not related to ocean cod species \u2014 can live more than 48 years, grow to about 6 feet and weigh more than 180 pounds, according to the government&#8217;s survey of Australian fish stocks.<\/p>\n<figure class=\"embed embed--type-image is-image embed--float-none embed--size-medium\">\n<p>      <span class=\"img embed__content\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/assets1.cbsnewsstatic.com\/hub\/i\/r\/2025\/10\/27\/89987622-e7f9-4cb0-bf32-d51d7f87fc76\/thumbnail\/620x444\/85ccd43aa4246b5aa480dcadea21b822\/gettyimages-131680077.jpg#\" alt=\"&quot;Muzza&quot;, Sydney Aquarium's resident one- \" height=\"444\" width=\"620\" class=\" lazyload\" srcset=\"https:\/\/assets1.cbsnewsstatic.com\/hub\/i\/r\/2025\/10\/27\/89987622-e7f9-4cb0-bf32-d51d7f87fc76\/thumbnail\/620x444\/85ccd43aa4246b5aa480dcadea21b822\/gettyimages-131680077.jpg 1x, https:\/\/assets2.cbsnewsstatic.com\/hub\/i\/r\/2025\/10\/27\/89987622-e7f9-4cb0-bf32-d51d7f87fc76\/thumbnail\/1240x888\/b1e6c040e49157401a7cc406a9b0f3a3\/gettyimages-131680077.jpg 2x\" loading=\"lazy\"\/><\/span><figcaption class=\"embed__caption-container\">\n<p>                  <span class=\"embed__caption\">&#8220;Muzza&#8221;, Sydney Aquarium&#8217;s resident one-meter long Murray Cod fish, waits to be fed on November 7, 2011.\u00a0<\/span><\/p>\n<p>                  <span class=\"embed__credit\"><\/p>\n<p>                GREG WOOD\/AFP via Getty Images<\/p>\n<p>                          <\/span><br \/>\n              <\/figcaption><\/figure>\n<p>&#8220;If we see this species breeding, growing well, migrating well, it&#8217;s a pretty good indication that the ecosystem in general is pretty healthy,&#8221; Tonkin said.<\/p>\n<p>The decade-long fish tagging project works closely with the Mallee Catchment Management Authority. It is funded by the state-financed Living Murray program, managed by the Murray-Darling Basin Authority.<\/p>\n<p><a href=\"https:\/\/australian.museum\/learn\/animals\/fishes\/murray-cod-maccullochella-peelii\/\" target=\"_blank\" rel=\"nofollow noopener\">According to the Australian Museum<\/a>, the Murray cod has a concave snout with a large mouth and small eyes. \u00a0It preys on fish, mollusks, turtles and some small terrestrial animals, including birds, mammals and snakes.<\/p>\n<p>Murray cod are listed as &#8220;<a href=\"https:\/\/www.environment.gov.au\/cgi-bin\/sprat\/public\/publicspecies.pl?taxon_id=66633\" target=\"_blank\" rel=\"nofollow noopener\">vulnerable<\/a>&#8221; under Australia&#8217;s Environmental Protection and Biodiversity Conservation Act. The species&#8217; populations have declined dramatically, according to the Australian Museum, initially because of commercial fishing. <\/p>\n<p>&#8220;More recently, overfishing, river degradation and human modification of the environment have caused major population declines,&#8221; the museum says. &#8220;Murray Cod are now relatively uncommon in most areas.&#8221;<\/p>\n<section class=\"content__body--footer\">\n<\/section>\n<p>    <!-- data-recirc-source=\"queryly\" --><\/p>\n<aside class=\"component list recirculation component--type-recirculation \">\n        <\/aside>\n<section class=\"content__body--footer\">\n      <!-- tags --><\/p>\n<section class=\"content__tags\">\n<\/section>\n<\/section><\/div>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6606220950177433\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- ItShrt World News -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     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