would salt water fish die in fresh water?
114606
Yes. They need a coating on their scales to protect them against the change in water condition. Some sharks can do this as well as some salmon...but in a tank....there is no way for them to live on.
14422
Unfortunately this is a sign of disease in fish. It usually comes before their death. You could try an antibacterial remedy.
411135
I think, and my marine physiology is rather out of date, that if a swim bladder was so packed with air that it would be unable to hold any more, the fish would be forced to the surface because of increased buoyancy, unless it expended a huge amount of energy to counter that (think 'swim down' from Finding Nemo, but have them doing it all the time).  If the swim bladder was unable to take in any air at all, and was somehow kept empty, the perch would sink unless it made the effort to keep itself at a certain depth.
198398
yes there are certain chemicals that when placed in a bay can effect salinity levels in that bay, which will actually vary the temperature of the water causing native fish and sea life to leave.
1021680
Depends on the kind of fish!\n\nTrouts need an extreme amount of oxygen, while some other fish could do with 10% of the amount...
219867
Yes.  A little drink is perfectly harmless (unless it's during a red tide or it's polluted).\n\nIt's only a serious problem when you are unable to drink anything else (like in a liferaft without fresh water).  The high salt content wouldn't quench your thirst for long and would just increase the salt in your body (further dehydrating you) and make you sick.
814698
I suppose if you took a fresh water fish and put him in the ocean, he wouldn't be able to deal with the salinity and would dehydrate - essentially die of thirst!!
691160
Fresh water creates a hypotonic environment for aquatic organisms. This is problematic for some organisms, whose cell walls will burst if excess water is not excreted. Some protists accomplish this using contractile vacuoles,[2] while freshwater fishes excrete excess water via the kidney.[3] Although most aquatic organisms have a limited ability to regulate their osmotic balance and therefore can only live within a narrow range of salinity, some fishes have the ability to migrate between fresh water and sea water.\n\nAs with many aquatic animals, most fishes release their nitrogenous wastes as ammonia. Some of the wastes diffuse through the gills into the surrounding water. Others are removed by the kidneys, excretory organs that filter wastes from the blood. Kidneys help fishes control the amount of ammonia in their bodies. Saltwater fish tend to lose water because of osmosis. In saltwater fish, the kidneys concentrate wastes and return as much water as possible back to the body. The reverse happens in freshwater fish, they tend to gain water continuously. The kidneys of freshwater fish are specially adapted to pump out large amounts of dilute urine. Some fishes have specially adapted kidneys that change their function, allowing them to move from freshwater to saltwater
657178
I don't want ot come across as a kn*b or anything but what do you mean - for use in what way? There are desalination plants that turn salt water in fresh water, marine life tends to prefer salt water...\n\nFlippantly (which no doubt will get me no points) all water is immediately available for use.
606929
Put in a plastic bag, make sure you leave holes in them, of course not at water level. Your fish will survive, don't worry. Fresh fish is better then dead ones.
48939
none water is H2O two parts hydrogen 1 part oxygen any thing else the water is inpure.but in the case of fish do a 1/4 water change every week so not to shock your fish make sure you keep temp about 78 degrees or they can get ick as far as testing you dont have to test fresh water but salt water is where the nitrite cycle is critical and then you also will test ph which is idealy 8 use a hydrometer to the line as it mesures the salt level by the boyency of the device nitites no higer than 14 i belive ask you pet shop owener as it been abuot 10 years since i had my salt water tank but for fresh water, the water change should cover it.
298760
Because the salt content will dehydrate you. And severe dehydration could kill you especially if you are out at sea and medical treatment is not nearby.
56295
Yes. Fish that live in saltwater lose moisture from their bodies through osmosis. These fish need to drink lots of water, or they'll become dehydrated. The extra salt is then simply excreted.
6704
The Dead Sea waters contain salts of magnesium chloride (53%), potassium chloride (37%) and only 8% sodium chloride, which is normal table salt. Magnesium chloride and pottasium chloride give the Dead Sea salt a bitter taste that makes it undesirable to consume, but not poisonous. \n\nHowever, since raw sewage runs into the Dead Sea it probably is unsafe to drink. The salinity may kill most of the bacteria, but there are trace metals that are hazardous that are found in these waste waters. Agricultural chemicals are another problem. \n\nSome Dead Sea salts are mined for 'therapeutic" uses, likely becuase some of the minerals in the salts are thought to be good for the skin. \nhttp://www.nextag.com/bulk-sea-salt/search-html
856464
Osmosis would literally suck all the water out of the fish's body therefore dehydrating it.  It would be like taking a saltwater fish and putting it in freshwater or visa versa.  The fish may live briefly before it's metabolic pathways shut down due to lack of water.
640334
Fish die when out of water because they have an internal skeleton. Because of that there is nothing to support their body structure when they are taken out of water and their body, especially the gills and heart, collapse under their own weight.\n\nLobsters have an external skeleton. That external skeleton covers their entire body and supports the gills as well as the internal organs. As a result lobsters don't have so much of a problem on dry land. The external skeleton also serves to protect lobsters from drying out, whereas the internal skeleton of fish offers no protection at all.\n\nThis is an example of what is called pre-adaption. Lobsters, crabs and so forth didn't evolve an external skeleton to enable them to live on land, they evolved it because it provided armour and allowed them to move more easily. But a side-effect was that they were better able to survive life on land.\n\n\nThere are many fish species such as eels that are perfectly able to survive on land provided they are kept moist. That is because they don't rely on their gills for breathing. But they still alack an external skeleton and still have major problems with drying out.
546460
If you find a catish caught on a trotline or such and it is dead.  A good rule of thumb is to look at the gills.  if they are pink, then it just died and the fish is still good.  if they are white, then dont take any chances by eating the meat.