Fish swimming backwards may be caused by swim bladder disease. When a fish swims backwards, it is usually caused by a problem with the adjustment of the swim bladder, which leads to an imbalance in the body. At the same time, the fish will also be unbalanced and tilt to one side when swimming. This is mostly because the fish swallowed a large amount of food while eating. Bad air, or poor food.

What to do if a fish swims upside down due to swim bladder disease:

1. When the owner finds that the fish has this phenomenon, he can first raise the water temperature to 20-25 degrees to help Fish digest quickly.

2. Fast for about three days. During this period, you should regularly observe whether the fish's symptoms have improved, and be careful not to fast for more than three days, otherwise it will cause harm to the health of the fish. certain influence.

3. Feed some peas to the fish. Peas are thicker and high in fiber, and they are great for relieving the symptoms of constipation in fish. You can buy a pack of frozen peas, boil them until soft, remove the skins, and then throw them into the water to feed the fish. The fish only need one or two peas a day.