Has anyone done an analysis on the importance, tractability, and neglectedness of keeping human-digestible calories in the ocean in case we need it after some global catastrophe?

Abstract

And also, what interventions can be done to increase the amount of human-digestible calories (as well as various nutrients) in the ocean that would be available after some global catastrophe? Actually, similar questions also apply for other calorie sources. For example, maybe eating insects is good on utilitarian grounds because it encourages the insect industry which can more easily continue to thrive even if the Sun gets blocked.