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Scientists Discover How Fish Evolved To Float At Different Sea Depths Scientists at the University of Liverpool have discovered how fish have evolved over the last 400 million years to stay motionless at different water depths.A research team led by Dr Michael Berenbrink, a Comparative Physiologist at the School of Biological Sciences, has revealed how modern fish, such as pike and cod, have developed a way of floating at certain water levels using a gas-filled swimbladder.
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