The difference between saltwater and freshwater fish is that saltwater fish need to prevent hyponatremia and freshwater fish need to prevent dehydration. This is because water tends to move from a place that has a lesser concentration of salt to one that has a greater concentration of salt.Know More
In saltwater fish, there is more salt in the water than in their bodies. To compensate, the fish need to excrete much of the salt they ingest. Some have gills that can remove the salt from the water and excrete it.
Freshwater fish get salt from their food and excrete great amounts of urine. Their kidneys are also good at retaining salt.Learn more about Fish
Saltwater fish osmoregulate by transporting salt out of their blood and into the surrounding water through specialized cells in their gills. Saltwater fish also only produce a very small amount of urine in order to retain the maximum amount of water.Full Answer >
There are no clear identifying features of saltwater fish compared to freshwater fish. The main difference between saltwater fish and freshwater fish is the regulation of salt and water in their bodies, which happens on a cellular level.Full Answer >
Freshwater fish live in rivers and lakes with very low salt levels, and saltwater fish live in seas and oceans that contain high levels of salt. The level of salinity in a fish's environment determines the type of fish it is. Common freshwater fish include trout, bass, salmon, and catfish. Most tropical, exotic and aquarium fish are freshwater fish.Full Answer >
Male fish may have larger pectoral fins and small white spots on their heads and pectoral fins. Female fish may be larger and rounder than males.Full Answer >