I did read about damaging effects of oyster farms though

Yeah no monoculture farm is without it’s damage, for sure, but oysters are real low on the list. They are filter feeders so don’t need any additional food source or fertilizer you just seed them somewhere and pull them out as needed. A single one filters something like fifty gallons of water a day, capture carbon for their shells, and they’re incredible at pulling heavy metals out of the water but that’s not something they’re utilized for at scale afaik because then humans wouldn’t want to eat those ones