 The presence of introduced brown trout had reduced the distribution to above a small instream barrier by 2002 and by 2012, trout had colonised above the barrier to the stream's source restricting the Shaw "Galaxias" to a small side tributary.In 2002 only found in one small stream (about wide and deep) made up of pools (on average deep), glides and riffles over a substrate consisting of bedrock, boulder and cobble.Also smaller areas of pebble, coarse gravel and sand.