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").
The Fish and the Ring her wedding ring in a spring, to her great distress. When she prayed for the return of the ring, a trout appeared on the surface of the water with the ring in its mouth. She exclaimed "Truly this place is a "Val d'Or"", from which the name "Orval" is derived, and in gratitude made available the funds for the foundation of the monastery here. The abbey arms show the trout and ring. The spring still supplies water to the monastery and its brewery. The Fish and the Ring "The Fish and the Ring" is an English fairy tale collected by