Originally Posted by
Big_Muddie
Hi NQCairns.
This is an extract from The Official Tide Tables and Boating Safety Guide and should answer your question.
Marking crab pots, dillies and traps in tidal and freshwater
All pots, dillies and traps used in tidal waters must be marked by an identifying tag bearing the surname and the address of its owner. When in use and not secured to a jetty, vessel or other fixed object, the pot, dilly or trap is to be attached to a light-coloured float not less than 15cm in any dimension - with the owner's name clearly inscribed in a contrasting colour.
In freshwater the floats must have the owner's surname written on it and be at least 15 cm in each of its dimensions or be a 2 or 3L plastic milk container.