How fast do fish swim?
It is estimated that the fastest fish (tuna, marlin, swordfish, mackerel) swim in excess of 50 kph, but the Sailfish and Wahoo can exceed 90 kph. The average fish would be pushed to reach 20 kph. Do Fish Sleep? All animals need rest or sleep, although the way most fish sleep is very different from our own. Fish have no eye lids, therefore it is difficult for us to tell whether they are asleep or not. Some fish do sleep soundly, a range of Parrot Fish that are found on the Great Barrier Reef can be picked up and handled by divers when asleep. However, most other fish probably slow down, hovering or cruising in mid-water or on the surface for short periods of time. This might explain why you can get close to a finning billfish without spooking it, and why some fast species of fish such as tuna are often found in the stomach contents of rather slow moving Tiger Sharks. Dolphins sleep with one eye open. Can Fish see colour? This is an often debated question. Some scientific studies have co
