The population that dramatically increased was the Zooplankton. It is located at the second trophic level.
What is the zooplankton?
Zooplankton is a type of consumer marine organism that is located at the second trophic level in the food chain.
Zooplankton is considered as primary level consumers because they eat producer organism (phytoplankton).
In turn, zooplankton represents the primary food for fishes (i.e., for secondary consumers).
Learn more about zooplankton here:
https://brainly.com/question/3931984
