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").
Fish Springs Range Fish Springs Range The Fish Springs Range is a 16-mile (26 km) long narrow, and north-trending mountain range located in center-west Juab County, Utah. The northeast of the range borders the Fish Springs National Wildlife Refuge; the entire east of the range borders the Fish Springs Flat, where the east region of the flat borders the Thomas Range. The Fish Springs Range lies at the south of the Great Salt Lake Desert; southwards, as well as southwest and southeastwards, north-trending valleys and mountain ranges drain northwards to the Great Salt Lake Desert. The sequence of these landforms west-to-east, are Snake