{"id":252801,"date":"2025-05-22T22:55:20","date_gmt":"2025-05-22T22:55:20","guid":{"rendered":"https:\/\/peraltafinancing.com\/aerospace\/clownfish-shrink-down-their-bodies-to-survive-ocean-heat-waves-new-study-suggests\/"},"modified":"2025-05-22T22:55:20","modified_gmt":"2025-05-22T22:55:20","slug":"clownfish-shrink-down-their-bodies-to-survive-ocean-heat-waves-new-study-suggests","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=252801","title":{"rendered":"Clownfish Shrink Down Their Bodies to Survive Ocean Heat Waves, New Study Suggests"},"content":{"rendered":"


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The adaptation appears to help the fish cope with high temperatures, since individuals and breeding pairs that shrank improved their survival odds<\/h2>\n
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Sara Hashemi<\/a><\/p>\n

– Daily Correspondent<\/span><\/p>\n

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Clownfish seem to become shorter during heat waves, according to the new study.
\n Morgan Bennett-Smith<\/span>
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A new study reveals that clownfish use a surprising strategy to adapt their bodies to ocean heat waves: They shrink.<\/p>\n

\u201c[Clownfish] have these amazing abilities that we still don\u2019t know all that much about,\u201d says study co-author Theresa Rueger<\/a>, a tropical marine ecologist at Newcastle University in England, to the Washington Post<\/em><\/a>\u2019s Dino Grandoni. The findings offer some hope for fish in the face of climate change, she adds. \u201cThere\u2019s potential that maybe some other species will adapt in a way that will allow them to hang on longer than we think.\u201d<\/p>\n

Rueger and her team didn\u2019t initially plan to study a heat wave. They were monitoring how freshwater runoff might affect breeding clownfish in Papua New Guinea\u2019s Kimbe Bay, when temperatures dramatically rose and warmed the water to 7.2 degrees Fahrenheit above average. But these conditions, they realized, offered a key opportunity for research.<\/p>\n

The scientists measured 134 clownfish in Kimbe Bay every month during the ocean heat wave, which spanned from February to August 2023. Astoundingly, 100 of those fish shrank. The researchers found that 71 percent of the dominant females and 79 percent of the breeding males reduced in size at least once over the study period. Their findings were published in the journal Science Advances<\/em><\/a> on Wednesday.<\/p>\n

At first, lead author Melissa Versteeg<\/a>, a PhD researcher at England\u2019s Newcastle University, thought she was making a mistake in her measurements. She kept trying again. And again. \u201cShe had several people measuring them at the same time to really make sure that we\u2019re confident with the numbers,\u201d Rueger says to Melissa Hobson at National Geographic<\/em><\/a>. But after these repeated attempts, she concluded the measurements were correct.<\/p>\n

The fish that shrank increased their chances of surviving the heat wave by 78 percent, according to the study. Some of the clownfish even shrank in pairs, reducing their size alongside their breeding partner\u2014a move that also boosted their chance of survival. The study marks the first time a coral reef-dwelling fish has been documented to shrink in response to environmental and social cues, according to a statement<\/a> from Newcastle University.<\/p>\n

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A pair of clownfish swims near an anemone. When the studied fish became smaller, females maintained a larger size than males.<\/p>\n

Morgan Bennett-Smith<\/span><\/p>\n<\/figcaption><\/figure>\n

Clownfish aren\u2019t the only animals shifting their size because of heat. Fish around the world are adapting to warmer temperatures by downsizing their bodies<\/a>. \u201cThis is another tool in the toolbox that fish are going to use to deal with a changing world,\u201d says Simon Thorrold<\/a>, an ocean ecologist at Woods Hole Oceanographic Institution who was not involved in the new work, to Adithi Ramakrishnan at the Associated Press<\/a>.<\/p>\n

But these clownfish stand out from the rest. \u201cUntil now, when talking about shrinking fish, nearly all studies do not mean that fish literally shrink but that they grow to smaller sizes,\u201d explains Asta Audzijonyte<\/a>, a senior lecturer at the University of Tasmania in Australia who was not involved in the work, to the Washington Post<\/em>. \u201cThis study, in contrast, reports observations of [clownfish] actually shrinking by a few percent of their total length over the course of a month.\u201d<\/p>\n

Previous research has found that\u00a0other animals<\/a>, like birds<\/a> and rodents<\/a>, appear to have gotten smaller because of climate change. And marine iguanas<\/a> will shrink in response to warmer water temperatures during El Ni\u00f1o years.<\/p>\n

The researchers don\u2019t yet know how the clownfish are pulling off their shrinking act. One hypothesis is that the fish are reabsorbing their own bone matter, reports the Associated Press. They\u2019re also not sure why, exactly, changing size is so advantageous to the clownfish. But it could be that a smaller size makes it easier to maintain oxygen levels or get by with less food available.<\/p>\n

\u201cIf you\u2019re small, you obviously need less food, and you\u2019re also more efficient in foraging a lot of the time,\u201d explains Rueger to National Geographic<\/em>.<\/p>\n

Still, this adaptation method can only go so far. The heat wave exacerbated coral bleaching<\/a>, which decreases available reef habitat, and subsequent heat waves ultimately killed many of the fish the researchers studied. \u201cWe\u2019ve lost many of those fish,\u201d Rueger says to the Washington Pos<\/em>t<\/em>.<\/p>\n

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