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How can fish change
its depth in water?
Since fish live in an environment in which they need to move in three dimensions, buoyancy plays a significant role in determining a fish's ability to swim efficiently. Fish use a couple of different strategies to solve this problem. Denser fish use their pectoral fins to create dynamic lift, similar to planes and birds. As these fish swim, their pectoral fins are positioned in such a way as to create a difference in pressure which allows the fish to maintain a certain depth.
Fish are a class of aquatic vertebrates. The combination of gills, fins and the fact that they live only in the water make fish different from all other animals.
1. Store low-density compounds in the body. They store various lipids in throughout their bodies ,which have lower densities than seawater. Squalene is one lipid that is stored in the liver of sharks.
2. Reduction of dense tissues. Chondrichthys do not have replaced bones with cartilage, which helps them reduce their weight in the water. Cartilage is 1/2 as dense as bone. They also reduce muscle mass and protein content. They also increase water content of tissues .
Fish swim by flexing their bodies and tail back and forth. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side. This motion moves them forward through the water
Fish use their back fin, called the caudal fin, to help push them through the water. The fish's other fins help it steer. Fish have 5 types of fins. They are the pectoral, pelvic, dorsal, anal and caudal fins.
How Does the Swim Bladder Maintain Buoyancy?
As a fish swims deeper into the ocean it experiences greater pressure on its body. At sea level people feel the weight of one atmosphere of air pushing on their bodies; 10 meters below sea level the weight of water exerts another atmosphere’s worth of pressure upon the body. Roughly every 10 meters down equals another atmosphere added. As a fish swims upwards or downwards it reacts to changes in pressure by adding or removing air from its swim bladder. To remain neutrally buoyant – that is to not float or sink – the fish will add air to its bladder when descending and remove air when ascending.