How long can a fish survive after leaving the water?
Everyone knows that a fish out of water dies quickly. In fact, how long a fish can live without water varies depending on its vitality. For example, the mudskipper can live at least a day or more out of water, while the yellow croaker is different: it dies within less than 20 minutes of leaving the water. Some fish can even leave the water for long periods. Let's take a look together below!
Why can't fish leave the water?
Fish use the four gills in the gill cavity to absorb oxygen from the water, then expel carbon dioxide from the body into the water through the opening and closing of the gill covers. Once out of the water, water cannot flow into the gill cavity, the gills quickly dry out, and the gill filaments stick to each other. As a result, the fish can no longer breathe through its gills, and without breathing, the fish dies from lack of oxygen.
How long can a fish live without water?
How long a fish can live without water depends on the species. A carp can live 10-20 minutes out of water, a crucian carp can live 20-40 minutes out of water, and other fish can live 1-10 minutes. But some fish can live for several days as long as there is some moisture. The snakehead has strong vitality: as long as there is a layer of water at the bottom of the container and it is in a cooler place, it can live a whole day without any problem. If the environment is very dry and it is exposed to the sun, it will probably last only about half an hour. After leaving the water, a koi can survive for about 10 minutes or even 1 hour, which depends greatly on whether its body is wet and on the size of the fish. If a koi under 10 cm is placed directly on dry ground, it will basically be beyond saving after ten minutes. If a large koi of over ten jin is placed in a moist, shady environment, it may live for an hour.
Which fish can still live after leaving the water?
1. Mudskipper: The mudskipper lives in swamps and estuaries and on mudflats, and is famous for being able to climb and jump out of water. It can breathe air out of water and the water vapor in its gill cavity, and can survive on land for long periods. If it does not swim out of the water periodically, it will die. The mudskipper has the habit of foraging out of water. Whenever the tide goes out, it often relies on the muscular stalks of its pectoral fins to crawl and hop on the mudflats to forage, or climbs onto rocks and mangroves to prey on insects, or climbs onto stones to bask in the sun. After it leaves the water, its well-developed gill chambers are filled with air, and it dips its tail in the water as an aid to breathing. Living out of water has become an important habit for it.
2. Climbing perch: The climbing perch, commonly known as the walking fish, is famous for being able to live, crawl and climb out of water, and can breathe air. It lives in ponds and ditches. Sometimes, with the help of the hard spines on the lower edge of its tail and gill covers, it makes sudden jumps and can briefly leave the water or “walk”, hence the common name walking fish. The climbing perch has a very well-developed labyrinth organ and can breathe air. It supports its body with its pectoral fins and swings its tail fin left and right, moving forward like a seal, and can maintain life on land for several hours. This is because part of its gills is shaped like rose petals with folds, densely covered with capillaries, which can directly absorb oxygen from the air and release carbon dioxide from the blood.
3. Eel: The eel can breathe through its skin. Sometimes when it leaves the water, as long as its skin stays moist, it will not die.
4. Snakehead: The snakehead can still survive for quite a long time after leaving the water.
5. Killifish: A kind of fish that can survive in trees for several months, also called the mangrove killifish. This fish lives in Latin American swamps. Whenever the swamps where they live dry up, they will try to “climb” onto the trees in the swamp, hide in cracks or hollows in the branches or trunks, and live there for several months. This little creature can temporarily change its own physiological structure so that it can breathe air, use its gills to retain moisture and nutrients, and use its skin to excrete waste. After returning to the watery land, it will return to its original form.
6. Lungfish: The lungfish uses plump sac-like structures as lungs. When the river water dries up in the dry season, it hides in the substrate and wraps itself in a waterproof, dried mucus cocoon to help it survive. The “lung” is in fact specialized from a well-developed swim bladder, so some species can survive by breathing air even without water. In water, its fins can support its body like legs.
Note: All fish need water. Even if they can live out of water, it is only temporary. Water fish and crocodiles also cannot live on land for long periods.