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").
Bonney Flat Bonney Flat Bonney Flat, previously "Bonney's Flat", is geographic location in South Australia west of Mount Pleasant, south of Mount Crawford and north of Birdwood (prev. Blumberg). Early farmers in this area include the Hannaford family. Not to be confused with Bonney Flat Creek, a few km west of Balhannah, South Australia, some to the south and west, where the Camac family were prominent settlers. Confusingly, this is the site of the Bonney Flat Cemetery. Note that the entry for Bonney Flat in the Manning index of South Australian placenames refers to this location, which once shared the same name.