As they live in water fish probably don't take water in as a conscious response to seek out and drink. Thirst is usually defined as a need or desire to drink water. It is unlikely that fish are responding to such a driving force. As well as getting water through osmosis, saltwater fish need to purposefully drink water in order to get enough into their systems. Where their freshwater counterparts direct all of the water that comes into their mouths out through their gills, saltwater fish direct some into their digestive tract.
More than 70 per cent of the world's fish catch comes from the Pacific Ocean. The second largest ocean covers about a fifth of the planet and contains 111,866 km of coastline. Meanwhile, the Dead Sea, located on the border between Israel and Jordan, is one of the most intriguing natural phenomena on Earth. Aside for some microorganisms and algae, this salt water lake is completely devoid of life. There's no seaweed, fish or any other creatures found in or around its turquoise waters.