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The body of a fish is denser than water, so fish must compensate for the difference or they will sink. Many bony fishes have an internal organ called a swim bladder, or gas bladder, that adjusts their buoyancy through manipulation of gases. In this way, fish can stay at the current water depth, or ascend or descend without having to waste ...
To regain the water, marine fishes drink large amounts of sea water while simultaneously expending energy to excrete salt through the Na + /K +-ATPase ionocytes (formerly known as mitochondrion-rich cells and chloride cells). [10] Conversely, freshwater has less osmolytes than the fish's internal fluids.
To regain the water, marine fishes drink large amounts of sea water while simultaneously expending energy to excrete salt through the Na + /K +-ATPase ionocytes (formerly known as mitochondrion-rich cells and chloride cells). [11] Conversely, fresh water contains less osmolytes than the fish's internal fluids.
Fish that live in the sea have found amazing ways to control the amount of water and salt in their bodies, and stay hydrated. ...
Amphibians and aquatic animals which live in freshwater do not need to drink: they absorb water steadily through the skin by osmosis. [4] [16] Saltwater fish, however, drink through the mouth as they swim, and purge the excess salt through the gills. [16] Saltwater fishes do drink plenty of water and excrete a small volume of concentrated urine.
Osmoregulation is the active regulation of the osmotic pressure of an organism's body fluids, detected by osmoreceptors, to maintain the homeostasis of the organism's water content; that is, it maintains the fluid balance and the concentration of electrolytes (salts in solution which in this case is represented by body fluid) to keep the body fluids from becoming too diluted or concentrated.
A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
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