Vegetables grow well in the seawater that culture sea animals, such as shrimp, abalone, crabs, etc. But aquaculture in the wild has many drawbacks, just as primitive harvesting of fruits & vegetables did. Progress was made when humans (initially, most likely women) learned to "garden" and sow and reap crops. My proposal sketches the same for aquaculture, depending upon a special suit.

The suit can be made from a unique membrane which I saw advertized decades ago by Edmund Scientific Supply. I still have a copy of one ad, from Scientific American Magazine, selling an "underwater ant nest" for an acquarium.

The ad reads: "...Silicone Rubber Membrane enables ants (and other creatures) to live and breathe normally by obtainig life giving oxygeom from water even though ant nest is submerged and sealed off from the atmosphere. When ants consume oxygen in nest, pressure decreases below that of oxygen pressure in the water -- allowing oxygen from water (but not water) to pass through membrane." (I remember another ad noting that carbon dioxide molecules will pass out the other way.)

The little oxygen needed by a colony of ants is provided by the membrane needed to surround their colony. A human would need a great deal more -- more than provided by the amount of membrane needed to cover an adult human body. So the suit must be made "redundant" by "ribs" which considerably extend the membrane surface. I draw a crude replica of the ribbed surface.

_________________|                |_______________
|________________                 _______________| (rib)
                 |  (inside       | 
                 |   suit)        |
_________________|                |______________   
|________________                 _______________|
                 |                | 
                 |                |
_________________|                |______________
|________________                 _______________|
                 |                |
                 |                |