21 C.F.R. § 102.57
Greenland turbot (Reinhardtius hippoglossoides)
“Greenland turbot” is the common or usual name of the food fish Reinhardtius hippoglossoides, a species of Pleuronectidae right-eye flounders. The term “halibut” may be associated only with Atlantic halibut (Hippoglossus hippoglossus) or Pacific halibut (Hippoglossus stenolepis).