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.Continue Reading
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
Yes, both saltwater and freshwater fish actively drink water. However, the amount they consume depends on the type of environment in which they live.Full Answer >
Colorful species of saltwater and freshwater fish include lion fish, Siamese fighting fish, Moorish idols and fantail guppies. Many of these species are available for home aquariums, though some of them have special needs and are not recommended for beginning hobbyists.Full Answer >
Small, freshwater fish, such as goldfish or betta fish, are ideal for living in a fishbowl. Fish tanks are required for larger fish or saltwater fish.Full Answer >
While the specific diet of a freshwater fish depends on its species, most eat smaller fish, leeches, worms, insects, crustaceans, plankton and krill. When kept in an aquarium, freshwater fish can thrive on a combination of fortified flake food, pellets, sticks and wafers.Full Answer >