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lightfish

Lightfish were small, glowing fish found in the deepest underwater caves around Ga-Metru[1] and Ga-Koro.[2] Ga-Matoran on Mata Nui used lightfish to provide illumination for their dwellings.[2]

Notes

Lightfish glowed in the dark and hovered in the water, waiting for prey to swim by. They never stopped glowing as long as they were alive.[3]