I think it has great potential.  For feeding chickens too.  Earthworms are an excellent choice for this food chain.  

A wacky idea I have had on aquaculture is kind of a free range fish farm.  Floating ocean platforms that house wind and wave and underwater ocean current generators could serve to culture oysters with the dock mounted system they use now.

They could also be designed to shelter fish and put extra air into the ocean with the wave machine output water.  A structure like this designed to increase food supply, just like natural structures, like corral does (where waves break on corral extra air is mixed with water), would incease food chain growth and GHG absorption all the way up through the local food chain around the platform.  From micro-organisms to large fish.

These could be designed to serve as corral seed beds too.  By planting corral on the underwater structure, than periodically replanting it in suitable locations on the seabed.

In over fertilized polluted areas like the Gulf coast/Mississippi delta, the wave machines could filter extra algae and weeds from the water and biodigest it, producing organic fertilizer and cleaning polluted water.  Biogas for clean kwh would alsio be produced.

Lakes and rivers over run by overgrowth due to fertilizer and manure run off could benefit from smaller models of these floating systems.  There are even micro-organisms that have a special ability to trap and concentrate heavy metals and radioactive contaminants for removal from the watery ecosystem.