Division 2 The restricted zone must have been defined on a case-by-case basis and:

it must take into account factors influencing the risks for the spread of infection with Bonamia ostreae including other establishments and wild molluscs, such as:

1. (i)

   the number, age, rate and distribution of the mortalities of molluscs on the establishment or group of establishments infected with Bonamia ostreae;

2. (ii)

   the distance to and density of neighbouring establishments or groups of establishments and wild molluscs;

3. (iii)

   the proximity to processing establishments, contact establishments or groups of establishments;

4. (iv)

   the species, especially susceptible species and vector species, present at the establishments or groups of establishments;

5. (v)

   the farming practices applied in the affected and neighbouring establishments and groups of establishments;

6. (vi)

   the hydrodynamic conditions; and

7. (vii)

   other factors of epidemiological significance identified;

the geographical demarcation must comply with the following minimum requirements:

1. (i)

   the protection zone must consist of an area included in a circle with a radius of at least one tidal excursion or at least 5 km, whichever is larger, centred on the establishment infected with Bonamia ostreae, or an equivalent area determined according to appropriate hydrodynamic or epidemiological data; and

2. (ii)

   the surveillance zone must consist of an area surrounding the protection zone, of overlapping tidal excursion zones; or an area surrounding the protection zone and included in a circle of radius 10km from the centre of the protection zone; or an equivalent area determined according to appropriate hydrodynamic or epidemiological data;

   or

3. (iii)

   where separate protection and surveillance zones are not established, the restricted zone must consist of an area comprising both the protection zone and the surveillance zone.