Andy Horton . Although, it is known that the Dahlia Anemone , Urticina felina , can engulf crabs almost as large as its own bulk, it is not known precisely how this occurs. I would expect a large crab to be sufficiently resistant to the stinging cells in the tentacles to be able to pull itself free, and this is what happened in the photograph. There are regulations forbidding collection from certain areas and at certain times of the year which the rockpooler should be aware of. These apply notably to Periwinkles .
Mussels are a good staple diet.
The trick is to boil them in their shells and scoop out the rich orange flesh. The Mussel flesh can be frozen. Prawns and Shrimps are best used as live food. It is a common mistake to put too many into the tank as the increased stocking level can cause an oxygen depletion. Limpets can prove too tough even after boiling, and are best used only in an emergency.