Designation of species is made difficult by the great variations in form of "Avicennia marina". A total of 10 mangrove species were reported in this area, dominated by "Avicennia marina". Females with young have been observed in grey mangrove ("Avicennia marina") forests. Among these "Avicennia marina" constitutes 99% of the mangrove population. Large concentrations of mangroves ("Avicennia marina") are located off its coast. Many mangroves ("Avicennia marina") are found off its southeast and east coast. A small area of grey mangrove ("Avicennia marina") occurs near Chinaman's beach. Small area of mangroves, Avicennia marina and Ceriops tagal, are found on the island. "Avicennia marina australasica" is the only mangrove in New Zealand. The species Avicennia officinalis, Avicennia marina are being used for fuelwood. "Rhizophora mucronata" and "Avicennia marina" are the predominant mangrove species found in the lagoon. Small grey mangroves ("Avicennia marina") line much of the southern half of the lagoon rim. Two types of mangroves dominate, grey mangrove ("Avicennia marina") and river mangrove ("Aegiceras corniculatum").