Spawning may or may not be tied to the seasons, depending on the species. The juveniles remain in shallower waters, gradually migrating to greater depths with age. The eggs are presumed to float up to the thermocline (the interface between warmer surface waters and cold, deeper waters) where they develop. They are known to produce a large number (over 100,000) of tiny (1–2 millimetres or 0.039–0.079 inches in diameter) eggs made buoyant by lipid droplets. As well as being important apex predators in the benthic habitat, some species are also notable as scavengers.Īs few rattail larvae have been recovered, little is known of their life histories. They are thought to be generalists, feeding on smaller fish, pelagic crustaceans such as shrimp, amphipods, cumaceans, and less often cephalopods and lanternfish. The benthic species are attracted to structural oases, such as hydrothermal vents, cold seeps, and shipwrecks. They may be solitary or may form large schools, as with the roundnose grenadiers. Grenadiers have been recorded from depths of about 200 to 7,000 m (660–22,970 ft), and are among the most common benthic fish of the deep (however, two genera are known to prefer the midwater). Light-producing organs, photophores, are present in some species they are located in the middle of the abdomen, just before the anus and underneath the skin. The animals are thought to use these muscles to "strum" their bladders and produce sound, possibly playing a role in courtship and mate location. Benthic species have swim bladders with unique muscles attached to them. The scales are small.Īs with many deep-living fish, the lateral line system in grenadiers is well-developed it is further aided by numerous chemoreceptors located on the head and lips and chemosensory barbels underneath the chin. The first dorsal flat is small, tall and pointed (and may have rays modified into spines) The second dorsal fin runs along the rest of the back and connects to the tail and the large anal fin. Rattails, characterized by large heads with large mouths and eyes, have slender bodies that taper very much to very thin caudal peduncles or tails (except for one species without a caudal fin): this rat-like tail explains the common name "rattail" and the name of the subfamily and the surname are derived from the Greek makros meaning "big" and Oura meaning "tail". The subfamily as a whole may represent up to 15% of the deep-sea fish population. Several attempts have been made to establish a commercial fishery for the most common larger species, such as the giant grenadier, but the fish is considered unpalatable, and attempts thus far have proven unsuccessful. They range in length from about 10 cm (3.9 in) in Hymenogadus gracilis to 2.1 m (6.9 ft) in Albatrossia pectoralis. The macrourins form a large and diverse family with 28 extant genera recognized (well over half of the total species are contained in just three genera, Coelorinchus, Coryphaenoides, and Nezumia). Found at great depths from the Arctic to Antarctic, members of this subfamily are amongst the most abundant of the deep-sea fish. Grenadiers or rattails are generally large, brown to black gadiform marine fish of the subfamily Macrourinae, the largest subfamily of the family Macrouridae.
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