Hutt River, Petone, 0.5 km upstream of estuary bridge, east bank, in fork of drainage-channel junction, Wellington Harbour, North Island, New Zealand, Pacific Ocean (41°13.82'S, 174°54.09'E); high tide level, poorly-sorted sandy mud, stiffened by the roots of a remnant clump of Juncus maritimus rush; normal river salinity in the area may be as low as 0.5‰