Other factors in addition to light availability that are likely to limit primary production in the oceans are; CO2 concentration.
Primary production is the synthesis of new organic matter by plants and other autotrophs called primary producers.
Primary producers are autotrophic organisms producing complex organic matter, using photosynthesis or chemosynthesis.
According to this question, photosynthetic protists are significant producers in aquatic ecosystems. This means that they are the major producer of organic matter in the oceans and seas.
However, asides light availability, which is a strict requirement for photosynthesis, the concentration of CO2 is also a factor that can affect primary production.
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