Question

Why sea water fish dont live in freshwater?

Answer 1

Goldfish can live only in a freshwater environment. Some fish species can live in both freshwater andsaltwater. These species are called euryhaline fish. Saltwater fish have a different body chemistry than their freshwater counterparts. Their bodies have hypertonic cells, which keep more salt inside the cells (than outside of them). Therefore, putting them in freshwater will make the water rush into their cells and and eventually kill them.