Just watched the new 60 Minutes,

and saw the 'revolutionary' concept of farming kelp and mussels on ropes, impregnated and sunk in the ocean, with an anchor on the bottom and a buoy on the top. No fertilizer or 'watering' like most crops. Drop it in and come back to harvest a few month later.
What a concept! New in the US, but we saw it in the Adriatic, where it's been done for decades, when we visited last year. Took pics and loved the meals.
Great new way to 'farm' the ocean.
I'm sure the Pub farm lobby is gonna try to KILL it, like Big Oil(R) attacks wind and solar energy.
It's who they and what they do.
Some things never change....