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Viperfish
Viperfish
Viperfish
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For the Bulgarian rock band, see Viperfish (band).
Not to be confused with the lesser weever, sometimes called viperfish.

Viperfish
Temporal range: 11–0 Ma
Late Miocene to Present[1]
Dana Viperfish, Chauliodus danae
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Stomiiformes
Family: Stomiidae
Subfamily: Stomiinae
Genus: Chauliodus
Bloch & J. G. Schneider, 1801
Species

See text

A viperfish is any species of marine fish in the genus Chauliodus. Viperfish are mostly found in the mesopelagic zone and are characterized by long, needle-like teeth and hinged lower jaws. A typical viperfish grows to lengths of 30 cm (12 in). Viperfishes undergo diel vertical migration and are found all around the world in tropical and temperate oceans. Viperfishes are capable of bioluminescence and possess photophores along the ventral side of their body, likely used to camouflage them by blending in with the less than 1% of sunlight that reaches to below 200 meters depth.[2]

Habitat

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Viperfish live in meso- and bathypelagic environments and have been found dominating submarine calderas such as the Kurose Hole, which is the site with the highest Chauliodus density known in the world.[3] Viperfish also engage in diel vertical migration, meaning they migrate up into more productive waters during the night to feed.[4] However, it is likely that only part of the total population of viperfishes engages in diel vertical migration on any given night, which could be due to their slow metabolism, i.e. they likely do not have to feed every night.[5] Temperature is another restricting factor in viperfish's vertical distribution in the ocean. Depth is restricted by temperature, and the upper thermal limit of viperfish is 12° to 15 °C.[5] In tropical waters, viperfish tend to stay in the deep layers and not migrate much, while in temperate waters viperfish are more actively migrating and even interacting with epipelagic predators.[5]

Body plan

[edit]

Chauliodus species are recognized by their large, fang-like teeth. They are so long that they would pierce the brain of the fish if misaligned.[6]

One species of viperfish, C. sloani, have a sampled standard length of 64.0 to 260.0 mm, with a mean SL of 120.3mm. The same species has a mean weight of 5.66 grams.[7] Representatives from Chauliodus pammelas and Chauliodus sloani display a size-based depth differential.[8] Individuals of a lesser mass are found at shallower depths and individuals of larger mass are found at deeper depths, below 500 meters.[5] However, at nighttime larger viperfish can be found in shallower depths.[5]

The eyes of Chauliodus sloani maintain a constant size and proportion throughout growth of the fish.[9] In the retina, several rows of rod cell "banks" grow upon each other, increasing in number with size of the fish.[9] This opposed the typical vertebrate retina, which only has one layer of receptors.[9]

The first dorsal ray of Chauliodus is elongated, hinged, and connected via musculature; allowing it to swing forward. The tip of this ray has light organs.[6]

Viperfish are covered in scales, arranged in five longitudinal rows. These scales are easily shed, and may be dissolved in preservation fluid when specimens are preserved,[10] leading some publications to describe them as scaleless.[6] Beneath the scales, the skin is covered with hexagonal pigment patterns and an opalescent, slimy substance.

Extremely large, fang-like teeth give the fish a slightly protruded lower jaw.

Bioluminescence

[edit]

Chauliodus species utilize their capability of bioluminescence for two distinct purposes: attracting prey and avoiding predators. They show distinct anatomical adaptations for the two functions.[11] Chauliodus possesses a bioluminescent lure located at the tip of its first dorsal ray, which it uses to attract prey by swinging it forward in front of its mouth.[11] This allows the fish to lure prey directly in front of its mouth for feeding.[11]

Chauliodus has photophores along the ventral side of its body that emit light through adrenergic nervous control.[12] The distribution of this light closely matches the distribution of light in mesopelagic and bathypelagic ocean zones, making it difficult for predators to see the fish.[2] This allows the fish to swim undetected by predators, aiding survival. This type of camouflage is called counter-illumination.

The presence of photo-microbes in the visceral organs of Chauliodus sloani indicates that bioluminescent microbes are likely responsible for the Chauliodus's ability to luminesce.[13]

Feeding

[edit]

Viperfish, depending on the species, prey on other pelagic fishes and crustaceans. Stomach contents of captured individuals have contained lanternfishes, bristlemouths, copepods and krill.[7] Based on the diel vertical migration of its prey, viperfish are assumed to be epipelagic migrants that search surface waters for food.[5] The prey for viperfish, specifically the viperfish species C. sloani, are highly specific and of high abundance but feeding events for viperfish have low levels of occurrence.

Viperfish are able to maximize energy input by consuming few but large prey.[7] In order to support the specificity of feeding, the viperfish has multiple adaptations such as a large-toothed mouth, modifications in its skull to allow for a wide opening of its mouth, and elastic stomach and body skin to compensate for large prey.[7]

Migratory patterns

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Vertical movements of viperfish are influenced by temperature. It was observed that the upper limit of distribution is restricted by temperature (12–15 °C). That is observed to affect vertical habitat and trophodynamics. In most tropical waters, it is likely that the viperfish exists full time below 400 meters. In temperate regions, viperfish trophically interact with epipelagic predators at superficial waters.[14]

Many sub-species in the Stomiidae family participated in diel vertical migration. In migrating to the surface (400m depth) at night, they prove their ability to withstand large temperature changes of up to 7°C daily. They have been recorded in waters ranging from 4 to 14.5°C, highlighting the wide range of temperatures viperfish are capable of surviving in.[15]

Viperfish have previously been recorded in the Italian waters off the western Mediterranean Basin, the Adriatic Sea, the Greek waters of the Aegean Sea, and in the Turkish waters of the Levant Sea. Viperfish have rarely been seen off the Algerian coast by Dieuzeide. They have been reported to occur off the northern Tunisian coast.[16]

Reproduction

[edit]

Despite the abundance of viperfish in the meso- and bathypelagic, their reproductive ecology is widely unknown. This is due to research surveys rarely being able to catch mature adults, as well as the general lack of research on fish reproductive ecology in the deep sea.[17] It is likely, however, that viperfish share a similar reproductive ecology to other dragonfishes which have been studied more extensively (under Stomiidae family).

Viperfish are gonochoristic, meaning that they don't exhibit both testicular and ovarian tissue simultaneously in their gonads.[17] They reproduce through spawning, with a study on dragonfishes indicating that males are able to spawn sperm continuously whereas females display asynchronous oocyte development and batch spawning.[17] That same study showed a skewed 1:2 sex ratio favoring females in their collection of over seventy Chauliodus sloani viperfishes in the Gulf of Mexico.[17]

Two Chauliodus macouni eggs were recovered in the Columbia River in Oregon (likely displaced by strong Pacific currents), indicating a potentially long incubation period for viperfish eggs.[18]

Species

[edit]
Pacific viperfish (Chauliodus macouni)

There are currently nine extant recognized species in this genus:[19]

At least two more species are recognized from Late Miocene-aged fossils:

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Viperfish

View on Grokipedia
from Grokipedia
Viperfishes are small, predatory deep-sea fishes belonging to the genus Chauliodus within the family Stomiidae, distinguished by their elongated, iridescent bodies, large mouths, and exceptionally long, fang-like teeth that protrude well beyond the , enabling them to impale prey larger than their own head. These adaptations, including a hinged for expansive opening, allow them to capture elusive prey in the lightless depths of the ocean. The most widespread species, Chauliodus sloani (), typically reaches lengths of 20–35 cm, with a slender form covered in photophores—bioluminescent organs arranged in rows along the body and a prominent, lure-like extension of the first ray. Viperfishes inhabit the mesopelagic (200–1,000 m) and bathypelagic (1,000–4,000 m) zones of tropical and temperate oceans worldwide, from 63°N to 50°S latitudes, spanning the Atlantic, Indian, Pacific, and parts of the . They exhibit partial , descending to depths of 700–900 m during the day and ascending to 600–700 m at night, influenced by temperature (5–12°C) and oxygen levels (2.5–3.8 ml/L), which restrict their vertical range. This behavior positions them as key players in the mesopelagic , where they contribute significantly to —up to 13% in some regions like the western Tropical Atlantic—and facilitate carbon export through predation on vertically migrating prey. Their diet consists primarily of nektonic and planktonic organisms, including small fishes like myctophids (e.g., Diaphus spp., 23% by weight in the western Tropical Atlantic), euphausiids, crustaceans, and chaetognaths, with larger individuals (>15 cm) shifting to a more piscivorous niche and capable of consuming prey up to 63% of their body length. Viperfishes employ their bioluminescent lures and photophores not only for but also potentially for species recognition and to evade predators. is oviparous, occurring year-round with low fecundity; eggs hatch into larvae around 6 mm long, and adults are dioecious with asynchronous spawning. Despite their abundance and ecological importance, viperfishes remain poorly studied due to the challenges of deep-sea observation, though they pose no threat to humans as they rarely surface.

Taxonomy

Classification

Viperfish belong to the Chauliodus within the order , family (commonly known as barbeled dragonfishes), and subfamily Chauliodontinae. This taxonomic placement positions them among the deep-sea ray-finned fishes (class ), characterized by adaptations to pelagic environments. The Chauliodus is part of the ancient stomiiform lineage, which originated in the around 91 million years ago and diversified into crown-group forms adapted to low-light, deep-sea conditions. While the broader have a record extending to the Upper , the viperfish itself first appears in the record during the epoch of the period, indicating a relatively recent radiation within the family. Diagnostic traits of the genus Chauliodus include the presence of elongated, fang-like teeth protruding from the lower and ventral photophores arranged in characteristic patterns along the body. These features distinguish viperfish from other stomiids and underscore their predatory specialization in dim oceanic realms. , facilitated by these photophores, is a shared among members for communication and hunting in the . Historically, viperfish were classified in the separate family Chauliodontidae, but phylogenetic analyses combining molecular and morphological data since the early 2000s have consolidated them into the subfamily Chauliodontinae within , reflecting a more resolved understanding of stomiiform relationships.

Species Diversity

The genus Chauliodus includes nine recognized extant species, all belonging to the subfamily Chauliodontinae within the family . These species are deep-sea predators adapted to mesopelagic and bathypelagic environments, with variations in body size, fin morphology, and arrangements serving as primary distinguishing traits. The , Chauliodus sloani (), is widely distributed in tropical and temperate waters across all major oceans, exhibiting 5–8 dorsal soft rays, an elongated first ray tipped with a luminous organ, and multiple rows of ventral s that produce blue-green light for and prey attraction. Other species include Chauliodus macouni (Pacific viperfish), endemic to the North Pacific Ocean and characterized by a relatively robust body form and maximum length of up to 30 cm; Chauliodus danae (Dana viperfish), primarily in the Eastern Atlantic and Indian Ocean regions with a slender form; Chauliodus barbatus, occurring in the Southeast Pacific; Chauliodus dentatus, in the Pacific Ocean; Chauliodus minimus, in the Eastern Atlantic; Chauliodus pammelas, in the Western Indian Ocean; Chauliodus schmidti, in the Eastern Atlantic; and Chauliodus vasnetzovi, in the Southeast Pacific. These species exhibit similar fang-like dentition and bioluminescent adaptations but differ in regional endemism and subtle meristic counts, such as variations in anal fin rays (typically 10–14 across the genus).
SpeciesCommon NamePrimary DistributionMax. Length (cm)Key Notes
C. barbatus-Southeast Pacific19.8 SLDescribed 1899; limited data
C. danaeDana viperfishEastern Atlantic, Indian Ocean15 SLSlender form; prominent dorsal luminescence; described 1929
C. dentatus-Pacific Ocean-Data Deficient (IUCN 2018); described 1899
C. macouniPacific viperfishNorthwest Pacific29.3 TLRobust body; fewer photophores; described 1890
C. minimus-Eastern Atlantic14.5 SLSmallest species; described 1974
C. pammelas-Western Indian Ocean19.5 SLDescribed 1892
C. schmidti-Eastern Atlantic23 SLDescribed 1948
C. sloaniSloane's viperfishCosmopolitan (tropical/temperate oceans)35 SL5–8 dorsal soft rays; multiple ventral photophore rows; described 1801
C. vasnetzovi-Southeast Pacific23.5 SLDescribed 1972
As of 2025, no additional species have been described in the genus, with the most recent addition being C. minimus in 1974; however, recent phylogenomic analyses using nuclear loci from multiple stomiiform taxa have confirmed the of Chauliodus within a restructured family. Most species are assessed as Least Concern by the , though C. dentatus remains owing to the difficulties of sampling deep-sea populations and limited ecological data.

Morphology

Body Plan

Viperfish of the genus Chauliodus possess a slender, elongated body that facilitates efficient movement through the in deep-sea environments, with maximum standard lengths reaching up to 35 cm. The body is covered in iridescent scales that range from dark blue to silver, providing in the low-light conditions of the . The head is disproportionately large relative to the body, with head length 10–16% of standard length, and features a wide, hinged that allows for significant gape expansion. The is a hallmark of the viperfish's anatomy, characterized by prominent fang-like teeth protruding from the , which are longer than the height of the head and curve inward toward the roof of the mouth. These teeth, composed of enameloid caps over stratified dentine, are firmly anchored to the bones and form a cage-like structure when the mouth is closed. The pelvic are small and positioned ventrally, while the is set far back on the body, with its first ray greatly elongated—often extending to half the body length—and tipped with a luminous organ. A small adipose lies between the dorsal and caudal fins, and the caudal fin is forked with soft rays throughout. Locomotion occurs primarily through lateral undulations generated by segmental myomeres along the body, supplemented by subtle fin movements for steering. Viperfish lack a gas-filled , an adaptation that prevents compression issues at high pressures; instead, is maintained via gelatinous tissues. The skeleton shows reduced typical of deep-sea fishes, with lightweight bones that reduce and enhance . Photophores, small light-emitting organs, are integrated into the ventral and lateral body surfaces, numbering in the dozens along the sides. Sexual dimorphism is evident in Chauliodus sloani, the most widespread species, where females attain larger sizes than males, with greater total lengths, body weights, and ages at maturity. Females typically reach maturity between 133 and 191 mm in length, while males mature at slightly smaller sizes, often around 130 mm or less. This size difference arises from prolonged growth in females compared to males, though other morphological distinctions, such as in fin structure, remain minimal.

Bioluminescence and Sensory Adaptations

Viperfish, particularly species in the genus Chauliodus such as C. sloani, possess specialized photophores distributed primarily along the ventral surface of their body, forming rows that include patterns like PV (18–21 photophores), VAV (24–28), and VAL (24–28), enabling precise emission in the dim . These organs are embedded in the skin and feature a complex structure comprising a photogenous chamber, lens, filter, reflector, and pigmented layer with granules, facilitating directed of glandular origin through the exocytosis of protein and granules from photocytes. Additionally, an esca-like organ at the tip of the elongated first ray serves as a prominent dorsal lure, distinct from the ventral . The emitted is , matching the dominant wavelengths penetrating deep water to support survival functions. The ventral photophores primarily function in , where the fish modulates its glow to mimic the faint sunlight from above, thereby eliminating its against the lighter water surface and evading predators below. This is enhanced by the photophores' angular light distribution, which closely aligns with the external daylight field across various viewing angles. In contrast, the dorsal esca lure produces light to imitate small prey or planktonic organisms, attracting potential victims within striking distance of the viperfish's fang-like teeth. Recent morphological studies using advanced imaging have revealed ultrastructural details, such as immunoreactivity in filter cells, confirming the role of these organs in both concealment and predation in the light-scarce . Physiologically, light intensity from the is modulated via neural and hormonal control, primarily through adrenergic innervation involving adrenaline and noradrenaline, which trigger sustained emission with peak intensities reaching approximately 13.9 Mq s⁻¹ per photophore under stimulation. Adrenaline sustains longer periods compared to noradrenaline, allowing dynamic adjustment to environmental conditions without high metabolic expenditure, as the glandular mechanism relies on efficient photocyte secretion rather than constant energy input. Complementing this, viperfish exhibit enhanced visual adaptations with large eyes featuring multiple banks of rod cells in the , providing heightened sensitivity to low-light levels for detecting bioluminescent cues or faint ambient illumination. The system is also well-developed, with neuromasts sensitive to vibrations and changes, aiding in prey localization and predator avoidance in the acoustically quiet deep ocean.

Habitat and Distribution

Geographic Range

Viperfish of the genus Chauliodus exhibit a cosmopolitan distribution across all major oceans, including the Atlantic, Pacific, and Indian, primarily inhabiting tropical and temperate waters between approximately 70°N and 56°S latitudes. This broad range encompasses warm oceanic regions worldwide, with some distributional gaps noted in the southern central Atlantic, northern Indian Ocean, and eastern Pacific north of the equator. While predominantly mesopelagic dwellers, viperfish are occasionally observed near the surface, contributing to records of their extensive horizontal spread. Species-specific distributions vary within the genus. Chauliodus sloani, the most widespread, is pantropical and subtropical, occurring in the Atlantic (from 60°N to 50°S), western Mediterranean, Indian, and Pacific Oceans. In contrast, Chauliodus macouni is restricted to the North Pacific, ranging from the and (66°N) southward to central and the (23°N). Chauliodus barbatus is more localized to the Southeast Pacific, with records primarily off the coast of . The genus was first described scientifically in 1801 from specimens collected by and Johann Gottlob Schneider, establishing early records of their oceanic presence. Modern surveys, such as NOAA's 2022 Voyage to the Ridge expedition, have expanded known ranges through remotely operated vehicle (ROV) footage, documenting species like Chauliodus danae in mid-water transects across the Atlantic. These observations highlight viperfish affinity for low-oxygen zones, influencing their regional .

Depth Preferences and Environmental Conditions

Viperfish, particularly species like Chauliodus sloani, primarily occupy the of the open ocean, residing at depths of 200–1000 meters during the day, with abundance peaks between 700–900 meters, and shifting slightly shallower to 600–700 meters at night. Some species extend into the (1000–4000 meters), where they contribute to deep-sea communities. These depths correspond to hydrostatic pressures ranging from approximately 20 to 400 atmospheres, which viperfish tolerate through specialized physiological adaptations that maintain cellular integrity under extreme compression. The environmental conditions in these habitats are characterized by cold temperatures of 4–12°C, well below the , where water remains stably chilled and dark. Viperfish associate closely with , often inhabiting layers just beneath them to exploit prey concentrations, and they endure low-oxygen (hypoxic) conditions typical of the mesopelagic, with dissolved oxygen levels of 2.5–3.8 ml L⁻¹, while avoiding severely suboxic waters below 1.0 ml L⁻¹. in their preferred habitats aligns with open-ocean norms of 34–35 practical salinity units (psu), providing consistent osmotic stability. These frequently occur near oxygen minimum zones (OMZs), where prey abundance is higher despite reduced oxygen availability. Physiological adaptations enable viperfish to thrive in such demanding conditions, preventing hypoxia during extended residence in OMZ-proximal waters. Their pressure-resistant , involving stabilized proteins and enzymes, allows survival at depths exerting up to 400 without structural damage. Recent 2025 research indicates that climate change-driven expansion of OMZs is compressing mesopelagic habitats, potentially shifting viperfish distributions upward and altering their environmental tolerances, with implications for prey availability and overall dynamics.

Behavior

Vertical Migration

Viperfish, particularly the species Chauliodus sloani, exhibit diel vertical migration, a behavior in which individuals ascend to shallower depths at night and descend to deeper waters during the day. During daytime, they typically occupy depths of 700–900 meters (range 400–1,000 m), while at night they migrate upward to 600–700 meters (range 400–1,000 m). This pattern results in a restricted migration amplitude of up to several hundred meters, with variations depending on location and individual condition. The migration is primarily driven by responses to light cues, such as twilight transitions, and the availability of prey in shallower layers. It is synchronized with the movements of (Myctophidae), which also perform diel migrations and constitute a major portion of the viperfish diet, allowing viperfish to exploit these epipelagic migrants efficiently. Many viperfish participate in this behavior, though only part of the population migrates, with some individuals remaining at depth to conserve energy after feeding. Ontogenetic shifts influence migration extent, with juveniles undertaking more pronounced vertical excursions to shallower depths compared to adults, which tend to occupy deeper average positions and exhibit reduced migration amplitude as they age. This shift aligns with changes in diet and preferences, as smaller individuals target more abundant shallower prey while larger adults adapt to deeper, more stable environments. Larger individuals show deeper distribution overall. Ecologically, viperfish migration plays a key role in facilitating the transfer of and nutrients from surface productivity to deeper layers, contributing to the biological carbon pump through predation on migrating myctophids. By descending during daylight, they avoid surface predators, enhancing survival while linking epipelagic and bathypelagic food webs. This ascent also provides brief opportunities for feeding on vertically migrating prey near the surface. Migration amplitude and patterns can vary regionally.

Feeding Strategies

Viperfish, particularly Chauliodus sloani, exhibit a diet that varies by region, often including significant proportions of (family Myctophidae, 23–36% by weight), other teleosts (31% by weight), and s such as euphausiids (0.2% by weight), with some studies showing predominance. content analyses from dissected specimens reveal a predominance of these prey items in the western Tropical Atlantic. This composition reflects their role as opportunistic piscivores in the , where fatty provide a high caloric yield due to their elevated content (up to 29% dry weight or ~6% wet weight). Their hunting employs classic predation, where the viperfish remains motionless in the , deploying a bioluminescent lure at the tip of the dorsal fin's elongate ray to mimic smaller organisms and entice curious prey within striking distance. Once attracted, the predator executes a rapid, explosive lunge, impaling victims on its prominent fang-like teeth to prevent escape, allowing consumption of prey up to half its own body size. This strategy is efficient in the low-light mesopelagic environment, enabling high success rates against mobile targets like migrating . Ontogenetic shifts in diet are evident, with juveniles (<15 cm) consuming more crustaceans such as euphausiids and copepods, transitioning to a fish-dominated diet in larger adults (>15 cm), where myctophids and other teleosts prevail and crustacean remains are rare. Stable isotope analyses (δ¹³C and δ¹⁵N) confirm this progression, placing viperfish at a trophic level of approximately 4.1 overall (3.9 for <15 cm, 4.3 for >15 cm), establishing them as mid-level predators within the mesopelagic food web. Vertical migrations facilitate access to epipelagic prey layers at night, enhancing foraging opportunities without altering core predatory tactics. Diet composition can vary regionally, with crustaceans predominant in some areas.

Life History

Reproduction

Viperfish, primarily represented by species in the Chauliodus such as C. sloani, are oviparous that reproduce through , where females release eggs into the water column to be fertilized by males. This mode aligns with the reproductive strategy of many deep-sea stomiiforms, facilitating dispersal in the vast pelagic environment. Reproduction in viperfish is characterized by batch spawning, occurring multiple times within a spawning season as part of a polycyclic pattern. Females exhibit continuous , allowing for the sequential development and release of egg batches rather than a single annual spawn. Males possess tubular testes supporting continuous throughout the spawning period, enabling prolonged reproductive activity. Fecundity in viperfish is non-deterministic and varies with size, typical of indeterminate spawners where final production depends on environmental conditions and energy reserves; batch is low, reflecting adaptations to the resource-limited , though precise estimates are lacking due to sampling challenges. Spawning cues for viperfish are poorly understood, with no direct observations of mating behaviors ; however, vertical migrations may facilitate encounters between sexes in the . Deep-sea conditions, including extreme depths and low densities, impose significant constraints on pairing and limit opportunities for synchronized . Histological studies confirm the absence of hermaphroditism, with distinct gonochoristic sexes observed in examined specimens. Overall, knowledge of viperfish remains sparse, derived mainly from histological analyses and larval surveys rather than direct field observations.

Growth and Development

Viperfish, particularly the species Chauliodus sloani, produce pelagic eggs that develop in the open ocean, hatching into larvae that resemble the leptocephalus stage of eels. These larvae measure approximately 6 mm in length upon hatching and exhibit early development of photophores, the bioluminescent organs characteristic of adult viperfish, which begin forming along the ventral surface to aid in and prey attraction in low-light conditions. During the juvenile phase, viperfish undergo rapid initial growth, following a von Bertalanffy model with parameters indicating an asymptotic length (L∞) of 27.0 cm and a growth coefficient (k) of 0.282 yr-1. Ontogenetic shifts occur in diet and habitat use, with smaller juveniles (<15 cm) relying more on crustaceans and smaller planktonic prey before transitioning to a piscivorous diet dominated by myctophids as they grow, coinciding with the establishment of diel vertical migration patterns by early juvenile stages. Sexual maturation in C. sloani typically occurs at lengths of 15-20 cm based on otolith-derived growth increments, with females achieving larger sizes ( total 21.9 cm) than males ( 21.4 cm) and displaying asynchronous oocyte development for batch spawning. Lifespan estimates from otolith analysis indicate a maximum of up to 11 years, with recent 2025 studies in the North Atlantic confirming this through detailed age-structure modeling and validating longer durations than earlier anecdotal reports for deep-sea stomiids. Mortality is particularly high during the larval stage due to intense predation in epipelagic waters, where small size and transparency offer limited protection against planktivorous predators. Adults face predation from larger bathypelagic species, contributing to overall in the .

References

  1. https://australian.museum/learn/animals/fishes/sloanes-viperfish-chauliodus-sloani/
  2. https://animaldiversity.org/accounts/Chauliodus_sloani/
  3. https://pmc.ncbi.nlm.nih.gov/articles/PMC7710699/
  4. https://www.fishbase.se/summary/Chauliodus-danae
  5. https://www.fws.gov/taxonomic-tree/1621231
  6. https://onlinelibrary.wiley.com/doi/10.1111/evo.12322
  7. https://link.springer.com/article/10.1134/S0031030114030150
  8. https://www.semanticscholar.org/paper/Late-Tertiary-radiation-of-viperfishes-based-on-a-Crane/97b0aef1d384eb86dff17287f68d2d624e970ba6
  9. https://bmcecolevol.biomedcentral.com/articles/10.1186/s12862-025-02453-0
  10. https://www.fishbase.se/summary/speciessummary.php?id=1786
  11. https://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatget.asp?spid=11153
  12. https://www.marinespecies.org/aphia.php?p=taxdetails&id=127338
  13. https://www.fishbase.se/summary/speciessummary.php?id=1261
  14. https://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatget.asp?spid=27914
  15. https://www.fishbase.se/summary/speciessummary.php?id=55094
  16. https://fishbase.se/identification/SpeciesList.php?genus=Chauliodus
  17. https://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatget.asp?spid=11011
  18. https://www.iucnredlist.org/species/190203/21909299
  19. https://a-z-animals.com/animals/viperfish/
  20. https://www.fishbase.se/summary/Chauliodus-sloani.html
  21. https://fishesofaustralia.net.au/home/species/1808
  22. https://www.whoi.edu/sloanes-viperfish/
  23. https://www.researchgate.net/publication/258420769_On_the_structure_of_teeth_in_the_viperfish_Chauliodus_sloani_Bloch_Schneider_1801_Stomiidae
  24. https://royalsocietypublishing.org/doi/10.1098/rsos.171063
  25. https://www.sciencedirect.com/science/article/abs/pii/S0272771425000277
  26. https://www.animalia.bio/sloanes-viperfish
  27. https://pmc.ncbi.nlm.nih.gov/articles/PMC12190095/
  28. https://www.sciencesource.com/1501042-viperfish-photophores-stock-image-rights-managed.html
  29. https://twilightzone.whoi.edu/explore-the-otz/creature-features/sloanes-viperfish/
  30. https://royalsocietypublishing.org/doi/10.1098/rspb.1972.0071
  31. https://doi.org/10.1016/j.acthis.2018.10.001
  32. https://scientificinquirer.com/2024/05/22/the-big-picture-a-photoluminescent-viperfish/
  33. https://allfishes.org/fishes/marine/sloanes-viperfish
  34. https://www.fishbase.se/summary/Chauliodus-macouni.html
  35. https://www.fishbase.se/summary/Chauliodus-barbatus.html
  36. https://oceanexplorer.noaa.gov/multimedia/okeanos-explorations-22voyage-to-the-ridge-gallery-media-ex2206-dive03-viperfish/
  37. https://www.nature.com/articles/s41598-020-77222-8
  38. https://www.int-res.com/articles/meps_oa/m733p095.pdf
  39. https://www.nature.com/articles/s43247-025-02568-8
  40. https://repository.library.noaa.gov/view/noaa/67139/noaa_67139_DS1.pdf
  41. https://www.sciencedirect.com/science/article/pii/S0889157525003242
  42. https://www.whoi.edu/ocean-learning-hub/ocean-facts/sloanes-viperfish/
  43. https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2020.00101/full
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