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Gollum Galaxias

Gollum Galaxias

A small, cryptic native fish endemic to New Zealand's South Island and Stewart Island/Rakiura, the Gollum galaxias lives in slow, weedy margins of wetlands, ditches, and headwater streams.

Named for its oversized, bulging eyes and preference for dark, sheltered places, it's a relic of an ancient freshwater lineage — not a target species, but a fish worth knowing about wherever trout water meets native habitat.

Scientific Name: Galaxias gollumoides

Physical Characteristics:
  • Short, stocky body with a blunt, rounded snout and large, bulbous eyes set high on the head — the feature that inspired the name.
  • Grey to olive-green base color with dark-brown splotches and a fine golden metallic speckling across the scaleless skin.
  • Six pelvic fin rays, one fewer than most other galaxiids — the most reliable way to separate this species from close relatives in hand.
  • Most individuals reach about 70 mm; larger Southland fish can approach 140–150 mm.

What to know

Habitat Distribution

  • Endemic to New Zealand — native only to the South Island and Stewart Island/Rakiura, with Stewart Island populations likely isolated by rising sea levels thousands of years ago.
  • A non-migratory freshwater species that completes its entire life cycle in fresh water, from lowland wetlands near sea level to small headwater streams up to 1,100 m elevation.
  • Slow-moving water is the constant: margins of small streams, wetland edges, ponds, and drainage ditches with aquatic plants and woody debris.

Specific Spots

  • Margins of slow-moving waterways where aquatic plants and submerged woody debris create dense cover — this fish stays close to structure rather than holding in open water.
  • During spawning, adults move to small cavities under boulders in streams, or onto vegetation in wetlands, where eggs are deposited and guarded.

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