Compulsory beekeeper registration depends on the beekeepers country/state jurisdictions and even sometimes down to their local municipal authority (city or council).
Here in Australia, by law, it is compulsory for beekeepers to register themselves and their hive/s with the DPI (or equivalent local body) and maintain the legal requirements for managing the hive/s.
Why do governments reinforce the importance to register?
The strongest reason here in Australia is to help with the prevention of the spread of unwanted pests and diseases, such as Varroa mite which has yet to reach out shores (without detection and eradication) and devastate our land, honey bees and honey/agriculture industries.
If you’re unaware of what your local laws are, I recommend contacting your closest beekeepers association or search your local cit/councils website.
I’d love to know if anyone out there has had a great experience with their local registering body or would like to share the regulations which may differer in your region?