Based on the provided information, we can match the changes in the fish's swim bladder to its behavior:
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Stays on the surface and can't swim well or hide: This behavior could be due to the koi eating food or insects that are too large, blocking the air intake. If the koi is unable to fill its swim bladder properly, it might struggle to maintain its buoyancy and stay submerged.
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Sinks to the bottom and can't fill the swim bladder or feed: This behavior likely indicates that the koi is stressed by dirty water with too much waste and too many nitrates. The poor water quality negatively affects the koi's ability to function normally, including the proper functioning of the swim bladder.
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The koi has a parasitic infection, like a worm, that prevents air from entering the swim bladder: This could correlate with a general lethargy or abnormal swimming behavior, as the parasitic infection can inhibit the koi's ability to effectively manage its swim bladder and maintain buoyancy.
So, in summary:
- Stays on the surface and can't swim well or hide: Koi eats food that is too large, blocking air intake.
- Sinks to the bottom and can't fill the swim bladder or feed: Koi is stressed by dirty water with too much waste and nitrates.
- Koi has a parasitic infection: Prevents air from entering the swim bladder, leading to abnormal swimming behavior.