 There are cockles and tuatua on the lower tidal flats, mussels from low tide on the rocks to subtidal beds closer to the mouth of the harbour, and scallops in the tidal channels.The scallop population has periodic incidences of high mortality, the causes of which have not been identified.Concerns in recent years about the size and availability of scallops have resulted in temporary closures of the scallop fisheries.