I am not totally convinced with insect farms. Creating food in the ocean has a unique aspect of not using land, which would allow for more of those carbon binding trees. With 71% of earth being covered in water there is a lot of unused space.

Promising technology from aquaculture are algefarming which can be used for carbon capture or ecological alternative for animal feed, seaweed farming which can either be used directly in human diet or as animal feed, molluscs, shellfish and fish farms. Some shellfish are already heavily involved in water treatment and water quality control.

Insect farms in comparison seems more limit in use, and harder in terms of cultural change. There has already existed plenty of cultures that have depended on the ocean for their diet, similar to cultures in the past which primarily depends on vegetarian diet. All that might be required for a cultural shift is a nudge in the right direction with economical incentives.

Bugs are currently used to create feed for animals. It's small scale but worth bearing in mind if a gradual phase out is desired.

I don’t think aquaculture refers to fishing, but rather to growing plants without soil.

Aquaculture doesn't refer to fishing, but it does refer to farming aquatic life, usually fish. You're probably thinking of hydroponics.

Yes, you’re right. My mistake!