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The water at sea and water in a river have different salt concentrations and therefore, are habitats to completely different organisms. These organisms must keep an internal environment similar to the ionic composition of their habitat. This is why marine fish excrete excess salts in the hypertonic sea water, while Freshwater Fish still have the ability to concentrate salts inside their bodies in an environment where there is none. If you were to put one of these types of fish in the other's environment, it would die due to the imbalance that occurs inside the organism's body.
However, there are some species that can tolerate both fresh and salt water, like the Delta smelt that lives in between freshwater and the sea. There are also some species that live in one type of water, and then migrate to the other in a later part of their life, like salmon whom are born in freshwater, then move to saltwater later on.
What else can I help you with?
What would happen if you put a sea water fish into fresh water?
The fish will get sick and die.
Can you put a fish you caught in the sea in your house aquarium filled with fresh water?
In most cases, no. The fish will die.
What is the different between river fish and sea fish?
Most sea fish have sharp teeth and most river fish have no teeth
Why does a fish die when you put it out of the water?
Fish have gills and they absorb the water of the sea, ocean or anyplace with water. It's just like air. Without air we would die. Without water fish would die.
Can you put fish and sea turtles together in aquarium tank?
No, they will most likely eat your fish.
Can sea fish swim in rivers?
No they can't because they need to have salt in the water. So no sea fish cannot swim in the river.
How do fish gets from the sea to us?
you get fish from sea to us by and when a rope put it into the water and when the a fish bits the rope you pull it out of the water
What can you put in with Tropical fish?
you can put in sea snails and more brightly fish that you cant get with a heater in your tank
When lightnig strikes the sea why do not all the fish die?
Because the sea is deep. But some fish get zapped.
Which Indian fish migrates from sea up river to breed?
Hilsa
What is definition of saltwater fish?
Saltwater fish have a natural habitat in the sea. Whereas, freshwater fish has a habitat in a river or a lake.
What happen if a sea water fish is put in a lake water and vice versa and why?
They will die. The cause being sea water has different organisms in it than fresh and not to mention salt.
