Animals

Why Fish Can Drink Salt Water And We Can't

When we drink saltwater it can kill us, yet our oceans are teeming with life. Why can some species survive in saltwater while others can't?

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Study Sheds New Light on How Some Fish Adapt to Saltwater (Phys.org)
"Tilapia fish readily adapt to fresh or salty water, making them both good candidates for aquaculture and potential invasive pests. New work at the University of California, Davis, shows how tilapia can change the protein makeup of their gills, allowing them to nimbly adjust to widely varying levels of water salinity."

Why Is the Ocean Salty? (ponce.sdsu.edu)
"How salty the ocean is, however, defies ordinary comprehension. Some scientists estimate that the oceans contain as much as 50 quadrillion tons (50 million billion tons) of dissolved solids. If the salt in the sea could be removed and spread evenly over the Earth's land surface it would form a layer more than 500 feet thick, about the height of a 40-story office building."

How Do Salmon Change From Freshwater to Saltwater Fish? (Science Daily)
"For decades, researchers have tried to find out what regulates changes in salmon when they transform from being freshwater to saltwater fish. Now they have come a little closer to an answer. A new study shows that light -- increases in day length in the spring -- affects developmental processes in the fish's brain during smoltification."