What happens if you put a salt water fish in fresh water? - Quora

What happens to a freshwater fish when it's put in saltwater? - Quora
Photo provided by Flickr
To understand why saltwater fish die when placed into freshwater, we first need to understand the structure of their cells. Fish cells are semi-permeable: Some elements can pass through them, while others cannot. In the case of our finned friends, water can move back and forth through the cellular membrane, but dissolved salt in the water is too big for the membrane, and won't pass through.
Fishing in freshwater is very different from saltwater, and for this reason the equipment you use will vary. Here’s a quick overview of each.
Photo provided by Flickr
Although there would have obviously been turbulence at the interfaces between the freshwater and saltwater layers, the silt and sediment particles would probably have settled without appreciable mixing of the waters, especially given the predominance of the powerful horizontal currents during the Flood. With the range of tolerance already cited above, many fish would have been able to survive the extended exposure to high water turbidities. Freshwater fish are smaller compared to saltwater fish, but they’re not difficult to catch, and the current is weaker than in saltwater.
Photo provided by FlickrThe majority of anglers start in freshwater simply because it’s cheaper compared to saltwater fishing.
Photo provided by FlickrExperementing with a saltwater fish in a freshwater tank. Guy at the pet store said it could be done. We'll find out!
Photo provided by Flickr
That's going to depend on the fish and on the concentration of salt in the water. Many fish regularly move between different concentrations of salt water, for example leopard sharks here in San Francisco Bay move easily between the nearly-fresh Delta and Petaluma marshes to the very saline south Bay and Golden Gate. Salmon and other anadromous fishes obviously also move from completely fresh water to ocean and back again.I'm not sure what the exact cause of death would be; I imagine a saltwater fish would have the minerals leached out of its body, osmotically, in freshwater, while a freshwater fish's system would be overloaded with minerals in salt. These would probably entail two different causes of death.And no, they wouldn't explode. Is the flesh of saltwater fish salty? Saltwater fishes' systems work to excrete salt from their bodies, while freshwater fishes' do not. A fish's osmotic balance will get way out of whack if it's put into water that's drastically different from the water that its metabolism has evolved a way to deal with.A fresh water fish's internal fluids are saltier than their medium so they continually take in water from their surroundings and must get rid of their excess water without getting rid of their minerals.Fresh water fish are faced with the opposite problem in salty water. They suddenly start to lose fluid and when they drink water it comes with a lot of minerals that their system can't get rid of.In reality freshwater fish can tolerate a very small amount of salt, but generally, they cannot tolerate saltwater because they cannot properly osmoregulate in saltwater.When a fresh water fish is put into salt water they start to lose water to their surrounds and I would think would need to drink. However, their excretory system wouldn't be able to handle all those excess minerals in their water intake.If your budget for setting up an aquarium is limited, then you should consider investing in freshwater fish tanks. There is really no minimum size requirement for freshwater fish tanks, which helps you start small, with few fish and accessories. If you want saltwater aquarium, however, you need to buy at least a 50-gallon fish tank to ensure a healthy habitat for your marine animals and plants. Maintaining saltwater fish tanks is likewise much more expensive because of the need for high-quality filters and pumps, live ornaments, salt mixes, and test kits to keep proper salinity and environment in the aquarium.