fish

Swim Bladder Disease

A condition causing fish to float uncontrollably, sink to the bottom, or swim sideways. Common in fancy goldfish and bettas. Can be caused by overfeeding, constipation, or infection.

Symptoms

Fish floats at the surface, sinks to the bottom, or swims sideways/upside down (E1).
Difficulty maintaining normal position while eating.
Distended belly in some cases.

Common Causes

Overfeeding, constipation, or foods that expand in the gut (E1).
Injury, infection, or sudden temperature change affecting the bladder.
Common in fancy goldfish and bettas (E1).

What to Check

Water quality and temperature first — rule out environmental causes.
Fasting for 24–48 hours, then easily digestible food, addresses constipation-related cases.
Watch for infection signs if the problem persists after fasting and water changes.

What Not to Do

Do not keep feeding while a blockage is suspected — fasting is the standard first step.
Do not medicate before correcting water quality and feeding habits.

This guide is informational and does not replace professional veterinary advice. If fish are severely ill, consult a veterinarian.

Swim Bladder Disease

Symptoms

Common Causes

What to Check

What Not to Do

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Swim Bladder Disease

Symptoms

Common Causes

What to Check

What Not to Do