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 Heron and the Fish The Heron and the Fish The Heron and the Fish is a situational fable constructed to illustrate the moral that one should not be over-fastidious in making choices since, as the ancient proverb proposes, 'He that will not when he may, when he will he shall have nay'. The first occurrence of the fable about the fastidious heron occurs in a late Mediaeval manuscript of Latin prose fables called "Opusculum fabularum" (little collection of fables), which claims to have rendered them from the Greek. A heron stands by the waterside one morning, surrounded by a rich choice of fish which