Hypoxia has proven to be a pressing issue for marine life over the last few decades. The presence of hypoxia has been estimated to increase due to eutrophication, which produces organic material that leads to various effects: competition for oxygen, increased temperature, and reduced coastal water oxidation, to name a few. Hypoxia inevitably leads to death among marine animals, reducing biodiversity in marine ecosystems. This article aims to detail the highest level of reduced oxygen that certain marine organisms can endure before it becomes fatal. Results show that the threshold amounts vary in different taxa. Regarding median lethal concentration, crustaceans are proven to show an increased threshold among other taxa. Fish appear to have the ability to withstand higher concentrations of hypoxia before reaching their threshold. The median lethal time results show that the results generally vary among taxa. One species was affected in mere minutes, whereas the species with the greatest endurance lasted multiple weeks. Overall, crustaceans proved to be the most sensitive organism. The researches have predicted that how affected an organism is by hypoxia can be linked to their adaptability. Mobile organisms are clearly better off as they can move out of hypoxic areas, with their speed not being considered a defining factor affecting their threshold.
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