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Going Up
  • Swim bladders are located in the center of a fish's body in order to help the fish's balance and swimming ability. According to the book "Goldfish", some fancy goldfish like the lionhead are poor swimmers because their swim bladder is located too far forward. When the fish wants to go up, a pneumatic duct opens to let in oxygen to swell the bladder up like a little balloon. By gulping, the fish can help fill up the bladder. Some fish, like the rudd, have two swim bladders.
Going Down
  • When the fish wants to swim lower, they deflate their swim bladders. The gas is absorbed into their gas glands, which are located on either side of the swim bladder. The fish's body can also use the gas glands to help inflate the swim bladder. Fish can also expel excess gas from their mouths in something similar to a belch. Also, if fish are caught in oxygen-poor water, they can use some of the oxygen in the gas glands or swim bladder to help them breathe. According to the Encyclopedia Britannica, some of fish species like sharks use oil instead of gas to inflate or deflate an area in the liver, since oil is lighter than water.
Going the Wrong Way
  • If a fish is swimming sideways, is unable to rise to the surface or is clearly having trouble swimming, chances are it is due to swim bladder disorder. If a fish is constipated, this could press the digestive organs against the swim bladder, not allowing it to inflate properly. According to HealthyBetta.com, a fish that has swim a bladder disorder should go on a fast for a day and not be fed so much in the future. Also, splitting the feedings to two or three a day is better on the swim bladder than one large feed per day.
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13y ago
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14y ago

Basically it is the ballast system a fish uses to maintain its depth

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Q: What is the swim bladder used for and how does it work?
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no, they have a swim bladder but this is so the fish can stay afloat


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no,they do not need a swim bladder as they do not swim...


A swim bladder can be found in what?

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Which parts of a bony fish is used to control buoyancy?

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What is the function of a swim bladder as found in a bony fish?

swim bladder is what helps the fish stay afloat without the swim bladder a fish would simply sink duhhh


Function of the swim bladder?

The swim bladder can fill by gulping air at the surface, this enables the fish to float or empty by loosing air from the swim bladder through a pneumatic duct (a pneumatic duct is an internal gas filled organ) connected to the oesophagus, this enables the fish to sink. got this answer from another person. i really hope that it is right


What special organ helps a boney fish float?

they have an organ called a swim bladder. It is filled with gas and it keeps them afloat.


What special organ help to keep bony fish afloat?

That would be the swim bladder.


What is the function of a swim bladder on a fish?

it helps to swim


What are some uses of a bladder in a fish?

To urinate, if you mean the urinary bladder. If you mean the swim bladder, it is to be able to change its depth in the water. It has a way to vent air from the gills to the swim bladder, and from the swim bladder to the digestive tract. So the fish would inflate the bladder to be able to rise and deflate the bladder to go lower.


What is the function of the swim bladder of fish?

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How do fish's swim bladders adjust to differences in fluid density?

The swim time course of the swim bladder response raises a problem. If a fish can not instantly adjust its swim bladder volume its buoyancy is unstable. As the fish rises in the water the pressure of the swim bladder decreases!