How does fish beat the heat?

First think about it: when we feel too hot, what will we do to beat the heat? Air conditioning, fan, swimming in the pool, etc. would be the things that come into mind. Yes, we beat heat with those things. But what will fishes do, if they feel hot when the temperature of the water is so hot? A recent new study has given an answer to it.

A team in James Cook University has found that in order to withstand a warming climate, fishes would retreat to the deeper ocean floor. This study, published in Coral Reefs however, provided direct evidence for the impact of climate change bringing to ocean ecology. 

Researchers have labeled 60 Redthroat Emperor Fish and released them at Heron Island, which is in the south of the Great Barrier Reef in east Australia. These fish are equipped with an electronic signaling device that can send a signal, it can provide the number, depth, and location information to the receiver. When these fish appear in the Great Barrier reef slopes, signals emitted by those electronic devices can be monitored. By year-long monitoring, the researchers found that these fish appear more in the reef slope when the temperature is low. At the same time, they found that when the temperature becomes higher, frequency of these fish appearing in deeper ocean increases.

The researchers considered the effects of temperature, barometric pressure, rainfall, wind and lunar gravity on the positioning of these fish. However, they found only the temperature was related to the occurrence of signals. By one year's monitoring, they found only when the temperature is below 24 degrees Celsius, these signals will be emerge. The researchers believe that there are other options for these fish. On the one hand to escape the heat, they can dive into the deep waters for these fish can tolerate a 160-meter-deep water environment. In addition, they can move farther, and migrate to the south ocean where the water temperature is lower. Because the researchers found the whereabouts of these fish in the west coast of Australia Perth coast, far away from the habitat of these fish.

The next step of them is to focus on whether these fish can adapt to high temperature environment, Leanne Currey, one of the researchers in this study, commented.

This is Written by Caroline from Creative BioMart.

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