How would a sea life in an area be affected if in oil spill killed that much of plankton in that area?

An oil spill that significantly reduces plankton populations would have devastating effects on the local marine ecosystem. Plankton are foundational to the oceanic food web, serving as the primary food source for many marine organisms, including fish and larger predators. The decline in plankton would lead to a decrease in fish populations and other marine life that depend on them, disrupting the entire ecosystem and potentially leading to long-term biodiversity losses. Additionally, the overall health of the marine environment would be compromised, affecting nutrient cycling and water quality.