how can fishes live at great depths in the oceans where the pressure could be >100 times the normal pressure ?
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Answer:
For creatures like the beaked whale, which is arguably the deepest diving cetacean (just under 10,000 feet), pressure is definitely an issue, but they have a wide range of adaptations to accommodate their deep-sea lifestyle choices. For example, the lungs of these creatures are completely compressible, meaning that they can force all of the gases in their lungs into their bloodstream and muscles, where it can essentially dissolve under the pressure. These organs have adapted to hold more myoglobin (oxygen-storing protein in muscles) and hemoglobin.
This collapse of the lungs also prevents gas exchange at the alveoli, thus preventing nitrogen from entering the bloodstream, which would result in the infamous “bends” that human deep-sea divers can experience if they rise from great depths too quickly. Essentially, one experiences “the bends” when dissolved gases emerge from solution as bubbles in the bloodstream, which can be damaging or even deadly. Many deep-sea diving creatures (like whales) have naturally learned how to rise slowly through the water, decompressing just as humans do to prevent this painful condition.
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