The difference in salt concentrations between the relatively low salt in the fish tissue vs the marine environments high salt cause an osmotic pressure imbalance. read more
Saltwater fish require a delicately balanced environment to thrive. The water used must have a pH, mineral content, temperature and salt content, or salinity, appropriate to the type of fish living in it. read more
saltwater fish need to breath in saltwater and not fresh water. just like we need to breath in oxygen and not carbon dioxide. read more