Black dragon fish
Malacosteus niger, commonly known as the black dragon fish, is a species of deep-sea fish. Some additional common names for this species include: northern stoplight loosejaw, lightless loosejaw, black loosejaw, and black hinged-head. It belongs to the family Stomiidae, or dragonfishes. It is among the top predators of the open mesopelagic zone. M. niger is a circumglobal species, which means that it inhabits waters ranging from the tropics to the subarctics. Not many studies have been conducted on its feeding habits, but recent research suggests that M. niger primarily feed on calanoid copepods which is a form of zooplankton. Indeed, it appears that M. niger primarily prey on zooplankton despite its apparent morphological adaptations for the consumption of relatively large prey. Another unique adaptation for this species is its ability to produce both red and blue bioluminescence. Most mesopelagic species aren't capable of producing red bioluminescence. This is advantageous because most other species cannot perceive red light, therefore allowing M. niger to camouflage part of itself to its prey and predators.
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CosmopolitanAnimals with cosmopolitan distribution are those whose range extends across all or most of the world in appropriate habitats. Another aspect of cos...
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OviparousOviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
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starts withMalacosteus niger has one of the largest relative gapes of any fish with the lower jaw being approximately one-quarter of the fishes length (Figure A). It has enlarged fangs the curve back into its mouth to prevent its prey from escaping its grip (Figure B). M. nigers is unique in that it does not contain gill rakers or gill teeth which is typically found in carnivorious fish species (Figure C). The anterior vertebrae appear to be unossified which enables the fish to “throw back its head” to take on relatively large prey. Lastly, M. nigers lacks an ethinoid membrane (no “floor” in its mouth) which allows for it to consume bigger prey species (Figure D). (Refer to image on right hand side of webpage). The lack of a floor of the oral cavity allows for decreased resistive forces which allows M. niger to close its mouth rapidly and easily trap its prey. This adaptation also minimizes the amount of energy required for M. niger to close its mouth, thus permitting it to quickly latch onto fast-swimming prey.
The postorbital photophore in this species is larger than in M. australis. It also differs in lateral photophore count, as well as in morphological characters. The maximum known length is 25.6 cm (10.1 in). Its specific epithet niger is Latin for "black".
Malacosteus niger is a circumglobal species and has a large geographic range. It can typically be found from the Arctic latitudes of 66° North and from 30° South in the Southern Hemisphere. While M. nigers is found throughout the world, it appears to be widely distributed and found often in the Eastern Central Atlantic Ocean. M. niger does not leave the mesopalgic and is known to have a vertical range from 500 meters to 1000 meters. Interestingly, it is believed to be the only member of the family that does not go through diel/vertical migration, which means that it does not migrate up to the surface like other fish species.
While the morphology of M. niger with huge fangs and an enormous gape is typical for its family and suggests adaptations to piscivory, its diet in fact contains a substantial proportion of zooplankton. Some of its documented prey include calanoid copepods, micronekton, decapod shrimps, and other decapods. M. niger digests its prey within a diel cycle, meaning the copepods it consumes at nighttime are digested by the afternoon the following day, which requires it to be constantly feeding on these small prey to sustain its energy. It has been recorded that copepods make up around 69%-83% of M. niger's diet. This suggests that availability of large prey at these depths is often limited. It is suggested that its dominant feeding mode is searching for zooplanktonic prey (copepods in particular) using bioluminescence to illuminate a small search area, since M. niger experiences infrequent encounters with larger prey items. Current research suggests that M. niger has adopted this unique feeding habit in association with the abundance of prey. Recent studies in the eartern Gulf of Mexico indicate that large calanoid copepods are three orders of magnitude more abundant than either fish or shrimp. More research is needed within different regions to confirm this hypothesis. It is suggested that its dominant feeding mode is searching for zooplanktonic prey (copepods in particular) using bioluminescence to illuminate a small search area, with infrequent encounters with larger prey items. The likely origin of the pigment necessary for detecting its long wavelength bioluminescence, a chlorophyll derivative, is the copepods themselves.
