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When a fish is alive it swims by moving its fins and tail rapidly, this keeps them from sinking.
But as we know when a fish is dead it no longer controls its body and there fore no longer swims, and as was just stated brings to the conclusion that when a fish is dead it no longer floats because it is no longer swimming.
Also, a fish doesn't have any air bladders that would keep them afloat as kelp do.
After death the air bladders shall allow the dead organism (a fish) to stay afloat until along with the body the air bladders decompose and release the air and let the dead body to sink.
But again, fish do not have air bladders so when they die they shall simply sink.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoUsually they only float when decomposition creates internal gasses inside them. A fish species with a ductless swim bladder will tend to float up quickly after death because there isn't a living system to regulate the volume of gas pressures within. http://www.taxidermy.net/forums/FishTaxiArticles/03/a/03AEEE5C04.html
Wiki User
∙ 11y agoAdd your answer:
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Compared to the density of water the density of a fish is?
The density of the liquid water is rho = 1,000 kg/m3 or 1,0 g/cm3. SI standard for density rho = mass m / volume V in kg/m3. A fish should have a very similar density to the water it swims in. Archimedes' principle states that the buoyant force on an object is equal to the weight of the water it displaces. The total vertical force on a fish is that of gravity, the buoyant force, and any reaction force generated by swimming. If the fish were much denser than water or saltwater, as the case may be, the weight of the displaced water would be much less than the fish's weight, and the fish would sink. If the fish were much less dense, then the fish would float to the surface. To keep at a desired depth, perhaps with a little help from swimming, the fish should be about as dense as the water it swims in. Many fish have a swim bladder, also called a "gas bladder", which fills with a gas, usually oxygen, and which helps regulate the fish's average density. The rest of the fish then is a bit denser on average than water.
What makes an object float rather than sink?
In general ... -- Density = mass divided by volume. -- If the object is less dense than the fluid surrounding it, it will float. -- If it's more dense than the fluid surrounding it, it will sink. This way of looking at it applies equally well to fish, battleships, birds, hot-air balloons, and air masses with different temperatures and densities.
Difference between saltwater and freshwater fish?
Some fish are salt tolerant and live in salt water (the sea) e.g. Tuna, Angelfish, lion fish, Ocean Trout, etc. Some fish are adapted to live in fresh water e.g. Brook Trout, Brown Trout, Rainbow Trout, Talapia, Catfish, Guppies, Mollies etc. Some fish can live in both sea water and fresh water e.g Salmon, eels etc.
What do deep water fish eat?
zooplankton etc
Why is it the fact that ice floats vital to life on earth?
If ice did not float, then the ocean basins would fill up with ice that never thaws and this would at least disrupt if not completely prevent ocean currents from distributing heat around the planet and Earth would be too cold for living things over most of the planet. Earth would be locked in a permanent ICE AGE. Life may still exist in equatorial regions but we can'e assume it would have the range, complexity, or diversity it has now.
Why doesn't fish float on water?
fish does float on water!
What are organisms that float near the surface of fresh water lakes?
algae people dead fish
Why is your fish floating onto its back?
Probably because it's dead, and it's bloated carcass, is floating on the surface. Check and make sure, but, it's more than likely dead. Fish usually do not float on the surface of the water, unless they are dead. Check first though, just to be sure.
Do dead betta fish float or sink?
they float belly upl... they float belly upl... float and, you don't really need to know because it will be easy to tell that it is dead.
How to preserve a dead stafish so you can put it in your fish tank as a decoration?
not a good idea it will decay in the water or probably just float
How do you know when a mosquito fish is dead?
when the gills stop breathing or when you poke it and it stops moving and some fishes float to the bottom when they first die and then they''ll start to float up because they release gas . Main signs that your fish will be dead is if there is no movement and it is being carried along by the water current. Also check for any visible signs of disease. If you cannot tell a classic sign will be using a net to gently move towards or possible touch the fish and if there is no reaction your fish is likely to be dead, generally your fish wont float at the surface unless sufferin from diseases such as dropsy. If it is discovered that your fish isnt dead check for disease and odd behaviour. It is also possible that your fish is resting as throughout the day your fish will rest at the bottom of the tank.
Why do dead fish sinks first then floats on water?
Because fish breathe water so when their lungs fill up it makes them sink but when it empties they rise which is why dead fish come to the surface when they die.
Is it normal for a Pearl Scaler fish to float upside down but is not dead?
No. Your fish has damaged its swim bladder.
How does a dead fish sink?
A fish has to be alive in order to prevent it from sinking, When it dies the water pushes it down just like everything else that is at the bottom of your aquarium. They have no air in them so they won't float.
Why does fish float on water despite the fact they are denser than water?
A fish may be denser than water. But in the body of a fish there is an air sac at its backbone which would fill with air which in turn allow it to float or rise with ease.
What fish eat whales?
NO FISH CAN EAT A WHALE! Unless the whale is already dead another fish can not eat it! If it is dead then it would float to the bottom, and bottom feeders would eat it.
What if the betta fish is not floating to the top and is sinking to the bottom?
Fish do not normally "float around" they swim. If your fish is floating/sinking then it is probably dead.
