Video has emerged of a frozen fish being reanimated after being frozen
Footage has emerged of frozen fish being ‘revived’ after being defrosted in hot water.
The video, filmed at a market in Japan, begins when a man places a fish – which appears to have been frozen – into a tub of crushed ice.
The man was seen grabbing the fish by the tail and trying to spin it under the hot water, when it started moving.The fish then started pounding hard before starting to squirm in the warm water.
According to an expert from the National Institute of Marine Aquarium, the fish is “most likely a related species to tuna”.
The fish in the video is probably not completely frozen but has simply been left in crushed ice at -2.10 C (28 F) for a short time.
Fish can survive this freezing cold because they have “anti-freeze” proteins in their blood.
The footage was uploaded to Pro Fishing Video’s Facebook page on Wednesday and has since been viewed 50,000 times.
Viewers posted comments to find out what was really going on in the clip, with some calling it spoofing or animal cruelty.
However, this curious appearance is actually a fairly common method of preserving fresh fish in Japan.
The fish are frozen just enough to slow their heart rate but not enough to kill them.
This keeps their meat fresh and tender to use in Japanese delicacies like sashimi.
Coldwater fish that live in freezing areas are able to produce antifreeze agents in their blood to help them withstand freezing temperatures, a permanent feature of the Antarctic fishes.
Seawater freezes at around -22C (28 F) because of the salts in the water. This is known as freezing point depression.
Fish are also ‘cold-blooded’ so their metabolism slows to a point that it can be barely detectable.
Due to the fish being relatively small they are able to warm up at a faster rate, hence the speed at which the fish in the video came ‘back to life’.
According to a study from Queen’s University, Canada in 2004, the blood of fish contains proteins that help them survive the cold.
After watching previous videos, experts have warned that this type of treatment can be stressful for the fish.
Repeated treatment will probably kill it.
Japanese researchers managed to revive in January 2016 a water bear that had been frozen for 30 years and survived.
Microanimal, which remained frozen for three decades, laid 19 eggs, 14 of which successfully hatched.