Best answer
A fish that dwells in salt water will contain some salty water within it. Put it in freshwater,and the freshwater will enter the fish by osmosis,causing its cells to expand and the fish todie. Conversely,a freshwater fish cannot survive in salt water. There are two types of freshwater fish: anadromous fish and catadromous fish.
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What happens if you put a fish in saltwater?
The effects of osmosis are deadly for saltwater fish when placed in freshwater. As a fish cells begin to swell, its body will take in excess water, causing a condition called osmotic lysis.
Can freshwater fish live in saltwater?
If you were to put a freshwater fish into a saltwater tank, it would die of dehydration. Freshwater fish can simply not survive in seawater because of the high concentration of salt. Through osmosis, the water inside a freshwater fish cells would be drawn out, and it would get fatally dehydrated very quickly.
How many fish move from freshwater to saltwater?
According to the Office of Science at the Department of Energy, Approximately 2 percent of all 21,000 species of fish actually move from fresh water to salt water or from salt to fresh at some point in their lives ( www.newton.dep.anl.gov ). notable examples are eels and salmon.
How do freshwater fish regulate saltwater?
Freshwater fish and saltwater fish regulate water and salts in their internal cells differently. Saltwater fish loses salt through their skin, while freshwater fish tend to absorb it. Osmoregulation in Freswater Fish. NOAA. Image modified by Biezl. Water is always trying to reach equilibrium.