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Malacosteus niger
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Stomiiformes
Family:	Stomiidae
Genus:	Malacosteus
Species:	M. niger
Binomial name
Malacosteus niger Ayres, 1848
Synonyms
Malacosteus choristodactylus Vaillant, 1888 Malacosteus danae Regan & Trewavas, 1930 Malacosteus indicus Günther, 1878

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.

Anatomy and physiology

Visual system

Malacosteus niger has yellow lenses that are believed to improve the functionality of the perception of their red bioluminescence. M. niger has adapted a retinal structure of "ten layer elements," similar to those found in surface-level species and other shallow-water living species — which also perceive red light. Its retina is made up entirely of rods and no cones, with rhodopsin/porphyropsin pairs and a single opsin bound to some of its photoreceptors, which provide visual sensitivity up to 517-541 nm (this falls within the wavelength of red light). Most deep-sea fish have a single visual pigment maximally sensitive at short wavelengths, approximately matching the spectrum of both downwelling sunlight and bioluminescence. For comparison, other red light producing stomiids, such as Aristostomias and Pachystostomias, have a third pigment which allows them to perceive light up to 588 nm and 595 nm respectively. The yellow lens reduce the amount of blue light that reaches the retina and increases sensitivity to longer wavelengths, which benefits M. niger and its red bioluminescence.

Yellow lens have also been identified in Echiostoma, which also produces red bioluminescence.

Morphology

Malacosteus 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".

Ecological and geographical distribution

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.

Diet

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.

Red bioluminescence

Malacosteus niger's unique adaptation of producing red bioluminescence is only found in two other deep-sea dwelling creatures, Aristostomias and Pachystomias. This rare form of bioluminescence can reach up to 700 nm in the deep-sea and cannot be perceived by green and blue bioluminescent organisms, thus granting M. niger a considerable advantage while hunting for food. Other deep-sea fish capable of detecting far-red bioluminescence, including Aristostomias and Pachystomias are able to do so using visual pigments. M. niger lacks these same long-wave pigments, and instead increases its sensitivity to red light using a chlorophyll-derived photosensitizer.

Malacosteus Niger has a tear-drop shaped, dark brown, suborbital photophore which is used to emit red light at an emission maxima of 710 nanometers. Removal of the top brown photophore layer causes a shift of the emission spectra to shorter wavelengths of around 650 nanometers. The photophores contain red-fluorescent material which is made to fluoresce via energy transfer from chemical reactions. Control of the photophore is maintained via innervation through branches of the fifth cranial nerve and this photophore. It is reported to be controlled independently of the postorbital blue photophore and has been noted to fluoresce for longer durations. The photophore is composed of a large pigmented sac containing a mass of scarlet gland cells. A thick, reflective layer lines the pigment sac, with occasional strands of reflective tissue running through the glandular core of the photophore. The outer layer is composed of large epithelial cells which merge into an inner, darker stained layer. The presumed function of this layer is to provide the brown layer through which fluorescence is filtered. The cells of the glandular core are characterized by a dense rough endoplasmic reticulum.

References

1. ^ Harold, A. 2015. Malacosteus niger. The IUCN Red List of Threatened Species. Downloaded on 20 February 2016.
2. ^ Sutton, Tracey T. (2005-11-01). "Trophic ecology of the deep-sea fish Malacosteus niger (Pisces: Stomiidae): An enigmatic feeding ecology to facilitate a unique visual system?". Deep Sea Research Part I: Oceanographic Research Papers. 52 (11): 2065–2076. Bibcode:2005DSRI...52.2065S. doi:10.1016/j.dsr.2005.06.011. ISSN 0967-0637.
3. McIntyre, Alasdair D. (2005). "Proxy login - URI Libraries". Fisheries Research. 72 (2–3): 361–362. doi:10.1016/j.fishres.2005.02.004. Retrieved 2021-10-16.
4. Somiya, H. (1982-07-22). "'Yellow lens' eyes of a stomiatoid deep-sea fish, Malacosteus niger". Proceedings of the Royal Society of London. Series B. Biological Sciences. 215 (1201): 481–489. Bibcode:1982RSPSB.215..481S. doi:10.1098/rspb.1982.0055. ISSN 0080-4649. PMID 6127717. S2CID 43144291.
5. ^ Douglas, R.H; Partridge, J.C; Dulai, K.S; Hunt, D.M; Mullineaux, C.W; Hynninen, P.H (August 1999). "Enhanced retinal longwave sensitivity using a chlorophyll-derived photosensitiser in Malacosteus niger, a deep-sea dragon fish with far red bioluminescence". Vision Research. 39 (17): 2817–2832. doi:10.1016/S0042-6989(98)00332-0. PMID 10492812.
6. Douglas, Ronald H.; Genner, Martin J.; Hudson, Alan G.; Partridge, Julian C.; Wagner, Hans-Joachim (2016-12-20). "Localisation and origin of the bacteriochlorophyll-derived photosensitizer in the retina of the deep-sea dragon fish Malacosteus niger". Scientific Reports. 6 (1): 39395. Bibcode:2016NatSR...639395D. doi:10.1038/srep39395. ISSN 2045-2322. PMC 5171636. PMID 27996027.
7. Regan, C.T. (1930-01-01). "The Fishes of the Family Stomiatidae and Malacosteidae". Danish Dana Expedition. 6: 1–143.
8. Kenaley, Christopher P. (May 2012). "Exploring feeding behaviour in deep-sea dragonfishes (Teleostei: Stomiidae): jaw biomechanics and functional significance of a loosejaw: DRAGONFISH FEEDING BIOMECHANICS". Biological Journal of the Linnean Society. 106 (1): 224–240. doi:10.1111/j.1095-8312.2012.01854.x.
9. ^ Kenaley, C.P. (2007). "Revision of the Stoplight Loosejaw Genus Malacosteus (Teleostei: Stomiidae: Malacosteinae), with Description of a New Species from the Temperate Southern Hemisphere and Indian Ocean". Copeia. 2007 (4): 886–900. doi:10.1643/0045-8511(2007)7[886:ROTSLG]2.0.CO;2. S2CID 1038874.
10. "Ocean Biodiversity Information System". obis.org. Retrieved 2021-10-16.
11. ^ Sutton, T. T. (2005). "Trophic ecology of the deep-sea fish Malacosteus niger (Pisces: Stomiidae): An enigmatic feeding ecology to facilitate a unique visual system?". Deep-Sea Research Part I: Oceanographic Research Papers. 52 (11): 2065–2076. Bibcode:2005DSRI...52.2065S. doi:10.1016/j.dsr.2005.06.011.
12. Herring, P.J.; Cope, A. (December 2005). "Red bioluminescence in fishes: on the suborbital photophores of Malacosteus, Pachystomias and Aristostomias". Marine Biology. 148 (2): 383–394. Bibcode:2005MarBi.148..383H. doi:10.1007/s00227-005-0085-3. S2CID 86463272.
13. Kenaley, Christopher P. (2009). "Comparative innervation of cephalic photophores of the loosejaw dragonfishes (Teleostei: Stomiiformes: Stomiidae): Evidence for parallel evolution of long-wave bioluminescence". Journal of Morphology. 271 (4): 418–437. doi:10.1002/jmor.10807. ISSN 0362-2525. PMID 19924766. S2CID 15947385.
14. Douglas, R. H.; Mullineaux, C. W.; Partridge, J. C. (2000-09-29). Collin, S.P.; Marshall, N.J. (eds.). "Long–wave sensitivity in deep–sea stomiid dragonfish with far–red bioluminescence: evidence for a dietary origin of the chlorophyll–derived retinal photosensitizer of Malacosteus niger". Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences. 355 (1401): 1269–1272. doi:10.1098/rstb.2000.0681. ISSN 0962-8436. PMC 1692851. PMID 11079412.
15. Herring, Peter J.; Cope, Celia (2005-09-28). "Red bioluminescence in fishes: on the suborbital photophores of Malacosteus, Pachystomias and Aristostomias". Marine Biology. 148 (2): 383–394. Bibcode:2005MarBi.148..383H. doi:10.1007/s00227-005-0085-3. ISSN 0025-3162. S2CID 86463272.

• IUCN Red List least concern species
• Stomiidae
• Fish described in 1848
• Taxa named by William Orville Ayres