These parents got their daughter a fresh water fish for her birthday. They made the mistake of not telling her that though.
Their daughter didn't know whether it was a salt water or a freshwater fish. She assumed it was a saltwater fish so she took it to the ocean.
She dumped the fish in the saltwater. When she was watching it swim away, the fish flipped over. She was so sad. This fish died because the concentration in the salt water has the same concentration as the fish. There was too much concentration around the fish.
This salt water fish got bought by a family and put in fresh water.
Once the family brought the fish home, they put the fish right in the water. It didn't take very long for the fish to die because for the water change.
There is not enough concentration in the water for the fish to survive.