This species is rated Nationally Endangered by the Department of Conservation and critically endangered by the IUCN, due to its small number of streams it occupies (an area of just 0.69 km2) and the threats of invasive species. Because G. eldoni lays very few eggs and has large, poorly dispersing fry, it is vulnerable to predation by introduced trout.
The G. eldoni species is classified as Nationally Endangered by the Department of Conservation and critically endangered by the IUCN due to its restricted geographical range (a small area) and vulnerability to invasive species. Its low reproductive rate and large, immobile fry make it susceptible to predation by introduced trout.