Can sea creatures detect smells under water?

Some animals like dophins use echo- location for hunting for prey. Some like fish have a lateral line in which they detect the vibration of the water. When you catch a fish and it struggles on the fishing line it sends out vibrations in it's struggle that alert other fish to it's distress. read more

Sharks can smell blood and attack wounded, more vulnerable creatures. We frequently spread chum - ground up dead fish bits into the water to attract fish behind a fishing boat. So yes, fish do smell (and not just stink) and do it quite well. read more

Other fish can react immediately to this distress, and so when the fish is being pulled in, it is often eaten by other larger fish as it is being brought aboard. Sharks are a predator that are notorious for their highly developed sense of smell. They can smell blood in the water at a level of parts per million. read more

The water is between 3 and 10 degrees Celsius and has low oxygen levels. Due to the depth, the pressure is between 20 and 1,000 bars. Creatures that live hundreds or even thousands of meters deep in the ocean have adapted to the high pressure, lack of light, and other factors. read more