Answer from "bestbehavior",
Fisheries Scientist :
Sharks are more numerous (both in terms of being many species of sharks and more individuals for species) and more widespread than whales. Also, baleen whales do not impact the fish populations directly, because they eat plankton. So in general I think that if we are talking about whether sharks eat more fish than whales do, the answer is yes, but the numbers to confirm this in a more scientific manner would be extremely hard to calculate. Also, keep in mind that sharks *are* part of the fish populations and some of them are also being heavily depleted by fishermen. At the same time, the plankton that whales eat maybe takes away food from other small fish and organisms, thus depleting them. As you can see, your question opened up what could be a very interesting discussion on the food web in the oceans and specifically what is called 'predator-prey interaction'. Thank you for asking it!

Thanks to Amanda from Winter Hill Middle School for submitting this question!