 The large, well developed eyes, with large pupils, are evidence of the importance of vision for prey detection.Although residual sunlight does not penetrate the depths inhabited by deep-sea lizardfish, their eyes aid in detecting distinct sources of residual or bioluminescent light.Deep-sea lizardfish have been known to have an expansive liver constituting up to 20% of total weight, serving as an energy reserve to sustain growth between sporadic feeding episodes.