Answer: Since light only reaches up to about 50-100 feet underwter, that would mean that plants and bacteria that use sunlight to give off oxygen wouldn't be living in those areas (and deeper), as a result, the oxygen levels would go way down.
Explanation:
The fact that light can only penetrate a depth of between 50 and 100 m in most ocean water implies that oxygen can only be abundant within this region of the water body.
There are photosynthetic organisms in water called phytoplanktons. These are plants that undergo photosynthesis. Recall that one of the products of photosynthesis is oxygen. This means that phytoplanktons are able to produce oxygen within this region where photosynthesis takes place.
Beyond this region, the oxygen concentration of the water body continues to fall until the bottom of the water body where the conditions are completely anaerobic.
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