Why Can T Saltwater Fish Live In Freshwater
Camila Farah
Once the saltwater fish drink the salt for hydration their kidneys pump the excess salt into their urine so they can get rid of it.
Tonicity comes in three types. That s why we need salt to keep from dehydrating when we sweat a lot. Of course freshwater environments do not allow for this due to the lack of salt. The hypertonic cells within a saltwater fish absorb water out while keeping salt within.
Hypertonic hypotonic and isotonic. Thus saltwater fish have. However most freshwater fish have no ability to adapt to saltwater and by placing them in a marine environment they will quickly dehydrate as they do not have the ability to drink the water as most marine fish do or fish that can. Salt is a desiccant it absorbs water.
Freshwater fish have learned to adapt to these changing conditions. Liquids inside freshwater fish are saltier than the water around them so the fish. The salt in the surrounding water exerts what is called osmotic pressure on the fish. In fact freshwater fish will often be unable to survive if the salinity levels of their surrounding water reaches more than 05 percent according to the national biological information.
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The water would flow into their body until all their cells accumulate so much water that they bloat and die eventually. If the water surrounding a fish contains too much salt water transfers out of the fish. Saltwater fish drink enormous amounts of water to keep from drying out. Saltwater fish are evolved to deal with water constantly rushing out of their bodies.
Saltwater fish can live in salt water since they have always lived in it and they are able to get it out of their selves. Saltwater fish rely on osmosis for survival which determines how much water enters and exits their cells. Why can t saltwater fish survive in freshwater.
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