For your convenience, I can elaborate on additional information regarding business regulations on different areas if needed.
Do you need a licence to breed and sell guppies?
In general, you likely do not need a license to breed and sell guppies as they are widely classified as ornamental fish for hobby purpose. While specific regulations differ per region, breeding and selling guppies generally fall under a hobby or small-scale activity permitted without a distinct license requirement. Nevertheless, if you plan to operate the sale and production of guppies as a formal commercial activity, certain permits or licenses may be needed to adhere to business licensing and tax regulations for commercial operations.