科学 · 德文特河翻车鱼
一条巨大的翻车鱼被推入深水区,随后又游了回来。
原语言视频
译自英文原文。
克里斯·里德在蒙特罗斯湾把一条巨大的翻车鱼从浅滩推开,试图为这种远洋动物开辟一条返回深水区的路。下午约3点他再次返回时,它又出现在他希望它不要出现的地方:浅水区。挪动这条鱼,并不足以让它留在那里。1
这次在塔斯马尼亚州德文特河的遭遇留下了一幕令人印象深刻的景象,却没有得到确认的救援结果。在2026年11月5日发布的一次ABC霍巴特Drive节目采访中,海洋生物学家内维尔·巴雷特根据这条鱼表面呈现的状况以及受淡水影响的水域,认为它的生存前景不佳。此后没有经核实的报道说明它是否到达了开阔水域、得到了援助或死亡。1
里德当时和孩子罗斯、斯文在霍巴特北郊蒙特罗斯湾的GASP步道附近散步。他们起初以为看到了一只海豹。附近一名女子认为那是一条受伤的鲨鱼;里德也一度猜测它可能是幼鲸。这只动物陌生的外形让最初的猜测都落了空。此前从未见过翻车鱼的里德把视频发给朋友埃利奥特·斯泰尔斯,由对方认出了它。1
这条鱼侧卧着。里德估计它的长度超过2米,高度也差不多——这是在水中形成的印象,并非测量所得的长度。它的体重和确切种类尚未确定。旁观者最初的猜测也不能证明它受了伤。1
里德下水把它往外推,直到水深略高于他的腰部。之后脚下岩石太多,还有贝壳,他也开始觉得冷。岸上有人告诉他,已经有人打电话求助,援助正在赶来,于是他停了下来。这一说法就是现有叙述的限度:它不能证明救援人员已经到场,也不能证明随后开展了有组织的救援。1
下午约3点返回时,里德发现这只动物已经一路回到了浅水区。他猜想它可能是迷失方向或受了伤。这些怀疑情有可原,但都不是诊断。他能够确认的是,自己试图挪动它的努力没能使它远离浅滩。1
河口中的远洋鱼类
对于海洋与南极研究所的研究副员巴雷特来说,特别之处并不只是塔斯马尼亚出现了一条翻车鱼。翻车鱼栖息于热带和温带海洋,包括南至塔斯马尼亚岛的海域。令他意外的是,在河口深处发现了一条翻车鱼:他解释说,这些是远洋动物,即使在沿岸水域也很少见。1
我得说,这极其罕见。
他提出,德文特河的地形或许可以解释其中一种可能。河口从风暴湾向内逐渐变窄,可能把动物带得更远至上游,使它难以找到出路。这是它陷入困境的一条合理路径,并非对这条鱼行程的还原。没人追踪过它是如何抵达蒙特罗斯的。1
即使水域合适,移动这种动物也是一项艰巨任务。巴雷特给出的翻车鱼平均体重大致在250公斤至1吨之间,并表示它们的体重可达2.5吨甚至更重。这些数字都不是里德所遇到那条鱼的重量。它们只是说明他试图推动的这种笨重动物有多大,而不是一条他能轻易抱起来的鱼。1
前景不佳,但并非定论
巴雷特的评估很悲观:他认为这条鱼很可能会死。它再次回到浅滩,在他看来表明它的状况已经不佳。它所在的位置又带来另一个担忧:德文特河这一段的地表水会受到河流径流带来的淡水影响,而完全适应海洋生活的鱼类并不适合栖居在这样的环境中。1
这种推断很重要,但其局限也同样重要。没有人对这条鱼进行检查,也没有测量它接触淡水的程度,或确定它陷入困境的原因。担忧的是淡水接触可能造成伤害,而不是有证据表明发生了化学品泄漏或确诊中毒。专家预测动物会死亡,不能代替对其已经死亡的观察。1
这次目击仍有助于加深对这些难以寻觅的鱼类的了解。与IMAS有关联的Redmap邀请社区成员记录当地少见的物种,帮助研究人员登记和绘制目击记录,并追踪其分布随时间的变化。这是一个监测项目,并非紧急救援服务;一次不寻常的来访也不能证明其成因与气候有关。77
对于这条翻车鱼,最后一个有确证的场景仍是里德返回时看到的那一幕:尽管他试图将它挪走,这只巨大的海洋动物还是回到了浅水区。它的生存前景不佳。它的命运仍然未知。1
来源54
Pulse Tasmania
ABC Tasmania
- HeyDay News
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来自 54 家媒体的 80 个来源· 引用最多的优先
ABC Tasmaniaabc.net.au7
- 首次报道于
- 'Massive' sunfish found in River Derwent
- Huge fish believed to be bump-head sunfish washes up at Petrel Cove along SA coast - ABC News
- Drive - ABC listen
- Giant sunfish washes up on Western Australia's southern coast - ABC News
- Beer bottles on floor of River Derwent make ideal home for endangered handfish - ABC News
- Whales in the River Derwent off Hobart's northern suburbs. - ABC News
- Huge sunfish washes up on Tasmanian beach - ABC News
Tasmanian Country Newspapertasmaniancountry.com6
Redmapredmap.org.au4
tas.gov.au2
Animalsnationalgeographic.com1
播出原貌
- A sunfish returned to the shallows after a resident pushed it toward deeper water. Marine biologist Neville Barrett said the animal would probably die, with freshwater exposure adding to his concern. How did an ocean-going fish reach so far upriver, and what chance did it have of surviving?
- Chris Reed found the fish near the GASP walkway at Montrose Bay, in Hobart's northern suburbs. He was walking with his children, Rose and Sven, when they spotted the animal lying on its side in shallow water.
- At first, they thought they were looking at a seal. A woman nearby thought it was an injured shark, and Reed briefly wondered whether it was a young whale. He'd never seen a sunfish before. He sent a video to his friend Elliot Stiles, who identified it.
- Reed estimated the sunfish was over two metres long and just as high. Those dimensions came from what he saw in the water. Even without a measurement, his description gives a sense of the animal he tried to move.
- Reed entered the water and pushed the fish outward until he was a little more than waist-deep. He stopped as the bottom became too rocky, with shells underfoot, and he was getting cold. Someone on shore told him a call had been made and assistance was coming.
- By around 3 p.m., when Reed returned, the fish had moved all the way back into shallow water. He wondered whether it was confused or injured. His effort to push it farther out hadn't kept it away from the shallows.
- Sunfish rarely enter an estuary like the Derwent. Barrett, a research associate at the Institute for Marine and Antarctic Studies, described this sighting as extremely unusual. These animals live mainly in the open ocean, and they're rarely seen even in coastal waters.
- Sunfish inhabit both tropical and temperate oceans, including waters as far south as Tasmania. Barrett suggested that the shape of the Derwent could help explain how one might end up so far inland.
- The Derwent narrows inward from Storm Bay. Barrett suggested that this shape could funnel an ocean-going fish farther upstream, leaving it struggling to find its way out. That's one possible explanation for its arrival at Montrose.
- There have been earlier Derwent sightings. Two separate Redmap records name Richard Curtis and Theo Muir Wilson in December 2014. Barrett also described occasional sunfish encounters around Norfolk Bay, and a recent animal washed up near Burnie.
- Barrett put an average sunfish at roughly 250 kilograms to one tonne. He said they can reach two and a half tonnes or more. Those are general figures. This fish wasn't weighed, but that bulk helps explain why moving one is so cumbersome.
- Barrett's concern went beyond the animal's size. He thought its return to the shallows suggested it was already in poor condition. River runoff also brings fresh water to the surface in this part of the Derwent. A fully marine fish isn't adapted to live in that environment.
- Barrett believed the fish would probably die because of its apparent condition and exposure to freshwater-influenced water. Nobody has confirmed what happened afterward, including whether help arrived, whether it reached open water, or whether it died.
- Unusual sightings also contribute to Redmap, the marine observation project associated with IMAS. It collects community observations of species uncommon in a particular area. Researchers use those records to log and map sightings and help track changes in where marine species occur over time.
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