Osmoregulation is the process of maintaining an internal balance of salt and water in a fish’s body. There is another type of fish, which roams both in sea water and fresh water. Osmoconformers match their body osmolarity to their environment actively or passively. Copyright © 2020 MyJoVE Corporation. (credit: modification of work by Duane Raver, NOAA) When they move to a hypertonic marine environment, these fish start drinking sea water; they excrete the excess salts through their gills and their urine, as illustrated in Figure 2. Take a look at this tutorial to know how the body regulates blood sugar levels and temperature... Read More. Fish are either osmoconformers or osmoregulators. Osmoregulation may be defined as “the ability to maintain a suitable internal environment in … [Source], Kültz, Dietmar. You're probably thinking "It's a fish surrounded by water, so of course it drinks! The bodily fluids of marine sharks and most other cartilaginous fish contain TMAO; this enables them to store urea and internally surpass the external osmolarity, allowing them to absorb water through osmosis. “Physiological Mechanisms Used by Fish to Cope with Salinity Stress.” Journal of Experimental Biology 218, no.
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