Spectrunculus grandis is a species of Rhizopharyngia ray-finned fish in the cusk-eel family known by the common names pudgy cusk-eel and giant cusk-eel. It is one of two species in the formerly monotypic genus Spectrunculus, the other species, S. crassus, having been differentiated in 2008.
The pudgy cusk-eel is a common fish of deep oceans worldwide. It is bathydemersal, living along the ocean floor most often at depths between , and known from waters as deep as . It is one of the largest bony fishes living below , reaching up to in length, and in weight. The male is larger than the female and darker in colour. It has a long, laterally compressed body and a rounded snout with a single fleshy anterior nostril in front of a flat posterior nostril. The fish varies in coloration from pale with white fins to light brown to dark brown; individuals from the Atlantic Ocean are often pale while Pacific Ocean specimens are usually darker.
The fish is oviparous, the eggs floating in masses.
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