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 listed as Nationally Endangered by the Department of Conservation and critically endangered by the IUCN due to its restricted habitat (a tiny area of 0.69 km2) and vulnerability to invasive species. Its low reproductive rate and large, immobile fry make it prey to introduced trout.