Excellent question. Unfortunately, I have not seen an answer to this before, so you will likely need to go to each jurisdiction and try to piece the answer together. For Maine, we have 1,281 acres of marine water leased for algae, shellfish and fin fish culture combined. That acreage produces roughly 26.5 million tons of farmed algae, shellfish and fin fish combined. Over 90% of that total production represents fin fish, while fin fish leases represent barely over half of the total lease acreage.

The area for global aquaculture is not documented; however, it has been calculated 16 million ha from discussions with various scholars. The calculation is that global aquaculture production: 60 million t and average production: 3.75 t/ha; so global culture area = 60/3.75 = 16 million ha. If you have different opinion, please kindly inform me.