Some of the legal requirements for starting an aquacultural facility in the UK:
- Fish Farm Registration :
Guidance to Register an Aquaculture Site 
Application for Authorisation of an Aquaculture Production Business (APB)
Application to Register an Aquaculture Site
- Abstraction and Discharge of Water
The Water Environment (Controlled Activities) (Scotland) Regulations 2011 :
A Practical Guide
Application to Register: Abstraction
Application to Register: Discharge
Application to Register: Discharge effluent from a fish farm
- Food hygiene and animal health
Contact the Food Standard Agency on the website