explanation the adaptation in fish body which makes floating on water as well as going in deep water easy
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Fish are a bit like birds or flying insects: They have built-in mechanisms that allow them to move up and down and side to side in their environment. But the methods that let fish do this are closer to the principles behind manmade flying machines than to natural flying methods. Most fish rise and sink in the water the same way a helium-filled balloon or a hot air balloon rises and sinks in the air.
To ascend, a fish must reduce its overall density by increasing its volume without significantly increasing its mass. Most fish do this with something called a swim bladder. A swim bladder is just an expandable sac, like a human lung. To reduce its overall density, a fish fills the bladder with oxygen collected from the surrounding water via the gills. When the bladder is filled with this oxygen gas, the fish has a greater volume, but its weight is not greatly increased. When the bladder is expanded, it displaces more water and so experiences a greater force of buoyancy. When the bladder is completely inflated, the fish has maximum volume and is pushed to the surface. When the bladder is completely deflated, the fish has minimum volume and sinks to the ocean floor. To stay at a particular level, a fish fills its bladder to the point at which it displaces a volume of water that weighs what the fish weighs. In this case, the forces of buoyancy and gravity cancel each other out, and the fish stays at that level.
Most fish rise and sink using this method, but not all do. Some species don't need a swim bladder because they spend all their life skimming along the ocean floor. Other fish, such as rays and sharks, ascend and descend by propelling themselves forward. Just as in an airplane, the movement of fluid under the fins creates lift, which pushes the fish upward. To learn more about this process, check out How Airplanes Work and How Sharks Work.
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To ascend, a fish must reduce its overall density by increasing its volume without significantly increasing its mass. Most fish do this with something called a swim bladder. A swim bladder is just an expandable sac, like a human lung. To reduce its overall density, a fish fills the bladder with oxygen collected from the surrounding water via the gills. When the bladder is filled with this oxygen gas, the fish has a greater volume, but its weight is not greatly increased. When the bladder is expanded, it displaces more water and so experiences a greater force of buoyancy. When the bladder is completely inflated, the fish has maximum volume and is pushed to the surface. When the bladder is completely deflated, the fish has minimum volume and sinks to the ocean floor. To stay at a particular level, a fish fills its bladder to the point at which it displaces a volume of water that weighs what the fish weighs. In this case, the forces of buoyancy and gravity cancel each other out, and the fish stays at that level.
Most fish rise and sink using this method, but not all do. Some species don't need a swim bladder because they spend all their life skimming along the ocean floor. Other fish, such as rays and sharks, ascend and descend by propelling themselves forward. Just as in an airplane, the movement of fluid under the fins creates lift, which pushes the fish upward. To learn more about this process, check out How Airplanes Work and How Sharks Work.
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Adaptations for Water. Many structures in fish are adaptations for their aquatic lifestyle. ... Fish have gills that allow them to “breathe” oxygen in water. Water enters the mouth, passes over the gills, and exits the body through a special opening
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