Osmosis - How do fish drink water? | #aumsum #kids #science #education #children

Topic: Osmosis
How do fish drink water?
That's easy. Using a straw.
No.
Fish take in water usually through their mouth or gills, depending on whether they live in freshwater or saltwater.
Freshwater fish takes in water mainly through its gills.
But Why?
Because it has less water and more salt concentration in its blood than the surrounding water.
Hence, due to osmosis, water from the surrounding flows through the gills into its bloodstream.
However, as the fish is continuously taking in water, it urinates a lot and removes excess water.
Saltwater fish takes in water through its mouth.
Really.
This is because its blood has more water and less salt concentration than the saltwater around it.
Hence, to maintain the balance, the fish gulps saltwater through its mouth, filters the water for its use and expels excess salt while urinating.