Jerdans Bay is recommended in the Pilot as an anchorage, but only for cruising boats seeking shelter in winds from E to S.
Winds can change direction suddenly in this bay, but in light winds it is great for anchoring in: Good as gold in a light northerly and can be pleasant in a southerly. Strong winds don't offer appealing conditions for anchoring.
Overnight anchorage is suitable only in winds from E to S. Some shelter can also be found in N sector winds, but it can be unpleasant if it is strong.
There are marine farms on both sides of the bay and a few nice little beaches behind the farms.
Depending on the size of your boat, you can possibly find enough space for anchoring behind the farms. Note that a stern line is impractical in this instance.