I cannot help you much on this subject.
I dont think there are aquaponics on the Island but i am not sure if i have my terminology correct.
Soil quality i think is good as there are or were farms on the Island and a few farmers that do produce some vegetables.
Poly tunnels are popular.
No rivers all water source are from rainfall that is stored for domestic an farming consumption.
I do not have any idea about fish imports.
Funding again I cannot help you with this but what I do know is that local support is available for development.
Moving 20 foot containers around is fairly straight forward.
You can move farming equipment around its fairly straight forward with some advice given on sizing.
Contact the website direct and I will connect you with some people that can help you.