Macrourus berglax shrimps, amphipods, polychaete worms, bivalve molluscs, isopods, brittle stars, other echinoderms and comb jellies. The roughhead grenadier is a slow growing fish. The females mature at an age of about 14 years and a length of while males reach maturity at a length of . The potential fecundity of the female is 17,000 to 56,000 eggs. The eggs are laid in batches and spawning takes place at any time of year, with a peak in late winter and early spring. The roughhead grenadier is landed as a by-catch when fishing for Greenland halibut ("Reinhardtius hippoglossoides") and Atlantic halibut ("Hippoglossus hippoglossus").
Ide (fish) German "orf", through the Latin "orphus" meaning a "sea fish" or "sea perch" which in turn derives from the Greek "orphōs". The generic name "Leuciscus" is derived from the Greek word "leykiskos" which means "white mullet". There are two recognised subspecies of the ide: The ide is a rather plump, sturdily built fish with a deep body, although not especially so. The peduncle of the caudal fin is thick. When they are small ide have dark backs and silvery sides but older fish develop a golden sheen along the flanks. At all ages the eye is yellow and the pectoral