Studies provide first evidence of basic growth restrictions in Antarctic fish

Antarctica’s thorny predatory fish (Harpagifer antarcticus).Credits: Lloyd Peck, British Antarctic Survey

Antarctic fish have adapted for thousands of years to survive below freezing in the Southern Ocean.

But in doing so, they lost their ability to grow at the speeds seen in their warmer water Cousin, even when I’m in the same place now water temperatureNew research suggests.

A study conducted by scientists at the University of Plymouth and the British Antarctic Survey found that the prickly predatory fish in Antarctica (Harpagifer antarcticus) And Shanny (Lipophyrs pholis), Also known as common Brennie.

Antarctic fish consumed about 20% less food than species in temperate waters and grew about half as fast, even if two ecologically similar species were bred in the same body of water. temperature..

These new discoveries show that fish living at Antarctic water temperatures have significantly increased the amount of cellular machinery required to make protein, but nevertheless it does not make protein at the same rate as warmer water species. You can’t, but the polar and mild fish velocities are very similar to the degrading proteins

In other words, this means that in Antarctic fish, the ability to convert new proteins into physical growth is significantly reduced.

As a result, researchers say that the evolutionary trade-off of being able to survive at polar water temperatures has significantly reduced their ability to grow as efficiently or rapidly as warmer water fish.

Similarly, this has important implications for exposure to predation and how many years it takes to reach sexual maturity.

Was announced in Royal Society Open ScienceThis study shows how Antarctic fish make and store proteins. Temperate water..

It also provides one of the largest comparative studies of fish protein metabolism, growth, and food consumption over a wide range of biologically relevant habitat temperatures.

Dr. Chiron Fraser, a lecturer in marine conservation at the University of Plymouth and lead author of the study, said: Species often live in a wide range of latitudes, making them more resistant to a wide range of temperatures. Our data show that Antarctic species have significantly lower growth rates and protein metabolism than temperate species, even when maintained at the same water temperature. As the ocean temperature rises with global warming, it reminds us of the differences in species that have evolved to live at significantly different temperatures. When Antarctic fish are exposed to increasing temperatures, they affect not only their survival but also their survival. Impact on many important physiological processes, including growth. “

Professor Lloyd Peck, Chief Physiologist on Animal Adaptation Extreme environment According to the British Antarctic Survey, “The seafloor of Antarctica has an unexpectedly high biodiversity, estimated to be home to about 20,000 species. So far, all species investigated. Has major problems with protein production, which seems to be an ubiquitous constraint. Living at low temperatures. There are many other unique adaptations to Antarctic marine species. fish It’s the only animal with a spine that doesn’t have Red blood cells Or because hemoglobin carries oxygen around the body, or giant sea spiders are thousands of times heavier than the largest in the temperate zone.Many of these other adaptations, as well as problems with protein production, may make life easier in constant cold environments, but appear to reduce their ability to survive in changing environments, and many Make a future outlook for the Antarctic Ocean Race dark. ”

Antarctic studies link warming with the decline of fish

For more information:
Life in the freezer: protein metabolism in Antarctic fish, Royal Society Open Science (2022). DOI: 10.1098 / rsos.211272..

Quote: Life in Freezer: Survey taken from on March 9, 2022 Antarctic fish (March 2022) 9th) provides first evidence of basic growth restrictions growth.html

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Studies provide first evidence of basic growth restrictions in Antarctic fish

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