02-03-2013, 12:36 PM
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Originally Posted by Stoke88
They came to that conclusion because its mouth was wide open.
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That means the fish was trying to take in more oxygen. Example, when something in the water is affecting fish (such as chlorine, ammonia, nitrite, nitrate, toxins) their respiration rate increases and the mouth naturally opens more in an attempt to draw in more oxygen-rich water. Gasping at the surface is also part of this.
This also occurs with almost any water-related issue, such as pH. If the fish has an internal problem, such as a protozoan, it may also be attempting to get more oxygen in the blood. The mouth in my experience is usually open upon death.
I won't say fish never choke, but from my experience and reading, this is very unlikely.