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Hypoxia is a condition in which there is a decreased amount or absence of oxygen in the blood. This condition often arises when an organism is placed in an environment in which oxygen levels are much lower than normal. In the case of ocean dwelling creatures oxygen levels are determined by the amount of dissolved oxygen in the water. Most fish are not able to tolerate poorly oxygenated water conditions for any extended period of time. But, a recent study has shown that the coral-dwelling goby, a tropical fish, often endures the harsh conditions of poorly oxygenated water. Amazingly, although in shorter durations, they can also survive periods of complete air exposure. Other species of fish avoid hypoxia by swimming elsewhere when conditions are not favorable. This is not an option for the goby because, they choose to spend almost their entire lives in a tiny space created...

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