Snailfish

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Snailfish
Snailfish.jpg
Snailfish (probably Elassodiscus tremebundus ) caught in the eastern Bering Sea
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scorpaeniformes
Superfamily: Cyclopteroidea
Family: Liparidae
T. N. Gill, 1861
Type genus
Liparis
Scopoli, 1777
Liparis marmoratus Festive Snailfish.jpg
Liparis marmoratus
Liparis catharus Purity snailfish.jpg
Liparis catharus
Liparis fabricii GelatinousSeasnail.jpg
Liparis fabricii

The snailfishes or sea snails are a family of marine ray-finned fishes. These fishes make up the Liparidae, which is classified within the order Scorpaeniformes. [1]

Contents

Widely distributed from the Arctic to Antarctic Oceans, including the oceans in between, the snailfish family contains more than 30 genera and about 410 described species, [2] but there are also many undescribed species. [3] Snailfish species can be found in depths ranging from shallow coastal waters to more than 8,300 m (27,200 ft), and species of the Liparid family have been found in seven ocean trenches. [4]

Taxonomy

The snailfish family, Liparidae, was first proposed by the American biologist Theodore Gill in 1861. [5] The 5th edition of Fishes of the World classifies this family within superfamily Cyclopteroidea, part of the suborder Cottoidei of the order Scorpaeniformes. [6] Other authorities do not recognise this superfamily and classify the two families within it, Cyclopteridae and Liparidae, within the infraorder Cottales alongside the sculpins, within the order Perciformes. [7] An osteological analysis found that the genus Bathylutichthys was intermediate between the Psychrolutidae and the two families making up the Cyclopteroidea, meaning that those two families would not be supported as a superfamily within the Cottoidei. [8]

Molecular biology

Species of deep-sea snailfish have been studied and compared to other ray-finned fishes (also known as teleosts) to analyze their adaptions to deep-sea conditions. The genomes of both the Yap hadal snailfish and Mariana hadal snailfish have been found to contain an abundance of the fmo3 gene, which produces the trimethylamine N-oxide (TMAO) protein stabilizer. [4] [9] Analysis of Yap hadal snailfish reveals a loss of olfactory receptors and gain of taste receptors, possibly due to the fairly restricted availability of food in the deep-sea. Additionally, perhaps due to lack of light in the deep sea, the Yap genome includes fewer copies of crystallin genes, which encode proteins that sense light and assist in focused vision, in comparison to other teleosts. [9] Meanwhile, Mariana hadal snailfish have lost several photoreceptor genes, decreasing their vision capabilities (especially in terms of color), and have completely lost the mc1r pigmentation gene, rendering them colorless. Mariana hadal snailfish also have adjusted to pressure due to a mutation in bglap which prevents cartilage calcification, revealed in their skulls. Further, their genome includes increased amounts of genes encoding enzymes for beta oxidation and transport proteins, thereby increasing membrane fluidity. [4]

Description

Snailfish have an elongated, tadpole-like shape. Their heads are large in comparison to their body and they have small eyes. Their bodies are slender but deep and they taper to very small tails. The extensive dorsal and anal fins may merge or nearly merge with the tail fin. Snailfish are scaleless with a thin, loose gelatinous skin which surrounds the spine and can vary in terms of size and shape between species. The gelatinous layer has a high water and low protein, lipid and carbohydrate content, therefore it can provide growth with low metabolic cost. This may aid species in avoiding predation and conserving energy, especially for deep sea snailfish who live in low energy conditions. [10] Some species, such as Acantholiparis opercularis , have prickly spines as well. Their teeth are small and simple with blunt cusps. The deep-sea species have prominent, well-developed sensory pores on the head, part of the animals' lateral line system. [11]

The pectoral fins are large and provide the snailfish with its primary means of locomotion, although they are fragile. In some species such as the antarctic Paraliparis devriesi, the pectoral fins have an expanded somatosensory system, including a taste bud. [12] The snailfish are benthic fish with pelvic fins modified to form an adhesive disc; this nearly circular disc is absent in Paraliparis and Nectoliparis species. Research has revealed that maximum depth of living can be a significant predictor for loss of the pelvic disk in certain species of snailfish. Based on phylogenetic analysis, this ancestral feature has been lost three separate times in Snailfish. [13]

Snailfish range in size from Paraliparis australis at 5 cm (2.0 in) to Polypera simushirae at some 77 cm (30 in) in length. The latter species may reach a weight of 21 kg (46 lb), but most species are smaller. Snailfish are of no interest to commercial fisheries.

It was difficult to initially study snailfish species that dwell at deeper levels because they would explode upon being brought to the surface,[ citation needed ] but researchers did manage to study the bones of the animal.

Occurrence and habitat

Snailfish habitats vary widely. They are found in oceans worldwide, ranging from shallow intertidal zones to depths of more than 8,300 m (27,200 ft) in the hadal zone. This is a wider depth range than any other family of fish. [14] They are strictly found in cold waters, meaning that species of tropical and subtropical regions strictly are deepwater. [3] [14] [15] They are common in most cold marine waters and are highly resilient, with some species, such as Liparis atlanticus and Liparus gibbus, having type-1 antifreeze proteins. [16] It is the most species-rich family of fish in the Antarctic region, generally found in relatively deep waters (shallower Antarctic waters are dominated by Antarctic icefish). [12]

The diminutive inquiline snailfish (Liparis inquilinus) of the northwestern Atlantic is known to live out its life inside the mantle cavity of the scallop Placopecten magellanicus . Liparis tunicatus lives amongst the kelp forests of the Bering Strait and the Gulf of St. Lawrence. The single species in genus Rhodichthys is endemic to the Norwegian Sea. [17] Other species are found on muddy or silty bottoms of continental slopes.

Depth record

Most snailfish species live in habitats no deeper than the bathyal zone (less than 4,000 m [13,000 ft] deep), but the family also includes the deepest-living species of fish. In October 2008, a UK-Japan team discovered a shoal of Pseudoliparis amblystomopsis snailfish at a depth of approximately 7,700 m (25,300 ft) in the Japan Trench. [18] These were, at the time, the deepest living fish ever recorded on film. The record was surpassed by a snailfish that was filmed at a depth of 8,145 m (26,722 ft) in December 2014 in the Mariana Trench, [19] and extended in May 2017 when another was filmed at a depth of 8,178 m (26,831 ft) in the Mariana Trench. [14] [20] The species in these deepest records remain undescribed, but it has been referred to as the "ethereal snailfish". The deepest-living described species is Pseudoliparis swirei , also of the Mariana Trench, which has been recorded to 8,076 m (26,496 ft). [14] [21] In 2023, the record was further extended when an unknown species of snailfish was filmed at a depth of 8,336 m (27,349 ft) in the Izu–Ogasawara Trench. [22]

In general, snailfish (notably genera Notoliparis and Pseudoliparis ) are the most common and dominant fish family in the hadal zone. [21] Through genomic analysis it was found that Pseudoliparis swirei possesses multiple molecular adaptions to survive the intense pressures of a deep sea environment, including pressure-tolerant cartilage, pressure-stable proteins, increased transport protein activity, higher cell membrane fluidity, and loss of eyesight and other visual characteristics such as color. [4] However, because of biochemical restrictions, 8,000–8,500 m (26,200–27,900 ft) is likely the maximum depth possible for any vertebrate. [23] [24] There are indications that the larvae of at least some hadal snailfish species spend time in open water at relatively shallow depths, less than 1,000 m (3,300 ft). [25] [26]

Reproduction and life span

Reproductive strategies vary extensively among snailfish species, though it is thought that many abyssal benthic snailfish spawn seasonally and for relatively long intervals. [27] As far as known, it appears that all species lay eggs that are relatively large in size (diameter up to 9.4 mm [0.37 in]) and the number of eggs is species dependent. [14] The larger size of eggs in hadal snailfish species indicates continuous spawning. [28] Some species deposit their egg masses among cold-water corals, kelp, stones, or xenophyophores and males will sometimes guard the egg mass. [3] [27] [29] [30] At least one species, Careproctus ovigerus of the North Pacific, is known to practice mouth brooding where the male snailfish carries the developing eggs around in his mouth. Some other species of the genus Careproctus, are parasitic, laying their eggs in the gill cavities of king crabs. The eggs put pressure on the crabs gills which can cause the gill tissue to be damaged or die altogether. [31] However, the survival of snailfish larvae has been shown to increase by the snailfish utilizing the crab host species as a way to care for and aerate their eggs. [3] The eggs themselves are self-adhesive and tend to form masses that replicate the shape of the internal branchial chambers of crabs. Additionally, at least one species of snailfish that utilize the golden king crab as a host, Careproctus pallidus, has larvae with a lower energy content than normal for most marine fish. A possible explanation for starting life with less energy is due to the safety provided by the king crab, allowing the adult snailfish to not expend as much energy producing an energy-rich yolk sac. [32] A different species, Careproctus rhodomelas, was found to be a batch spawner, laying multiple batches of large eggs multiple times throughout its lifetime. [33]

After the eggs hatch, some species rapidly reach the adult size and only live for about one year, [29] but others have life spans of more than a decade. [34] Otolith analysis (the investigation of snailfish ear bone) gives an abundance of insight into longevity of life by seeing how it is broken into alternating translucent and opaque zones. This relays information about annual growth. [25] By further examining the morphology of the deep-sea snailfish, it may be evident that these snailfish have adapted to their extreme environment by having a short life span compared to other organisms in the same hadal environment. Many species are located in hadal trenches, which are inherently high-disturbance areas, including lots of seismic activity which can trigger turbidity flows. Because of this, they live significantly shorter lifespans than shallower species. [35]

Very little is known about snailfish courtship behavior but males of Careproctus pallidus are believed to wiggle their bodies as attractive or aggressive display. [36] [37] It is thought that in an environment so dark, it is hard to find and win contests for a mate. Therefore, snailfish use hydrodynamic signals that are felt by the mechanosensory lateral line to communicate.

Diet

Larval snailfish feed on a mix of plankton, small and large copepods, and amphipods. The larval diet of three Beaufort Sea snailfish species contained 28 food categories, mainly copepods and amphipods. [38]

Snailfish prey can be grouped into six main categories: gammarid, krill, natantian decapods, other crustaceans, fish, and others. [39] Size also affects snailfish diets; snailfish smaller than 50 mm primarily eat gammarids, while species larger than 100 mm primarily eat natantian decapods. Species larger than 150 mm have the highest proportion of fish in their diet. The largest snailfish species tend to be piscivorous. [39]

With the Okhotsk snailfish (Liparis ochotensis), the ratio between food intake and body weight changes as the organism grows; it is also highly seasonally variable. When the local environment experiences an increase in shrimp and crangonidae numbers, there is also a subsequent decrease in decapods. [40] There are also snailfish localized to the Terpeniya Bay that purely eat zooplankton, setting them apart from other snailfish. [40]

The snailfish that live in the northern hemisphere also display a higher starvation tolerance, and while it is still being studied, it is suggested that this is due to the triglycerol and cholesterol levels in this species. The snailfish have different lipid concentrations depending on their habitat, making some of them better-suited for longer periods without feeding than others. [41]

The ambush hunting methods employed by the Simushir snailfish (Polypera simushirae) are unique among snailfish. They have the ability to blend into the ground, waiting to surprise the next organism to wander into their path. The top prey for this species are fish, making up 97.7% of their overall food intake. [42]

Genera

This family contains these genera as of 2020: [2]

Related Research Articles

Trimethylamine <i>N</i>-oxide Chemical compound

Trimethylamine N-oxide (TMAO) is an organic compound with the formula (CH3)3NO. It is in the class of amine oxides. Although the anhydrous compound is known, trimethylamine N-oxide is usually encountered as the dihydrate. Both the anhydrous and hydrated materials are white, water-soluble solids.

<i>Pseudoliparis amblystomopsis</i> Species of fish

Pseudoliparis amblystomopsis, or the hadal snailfish, is a species of snailfish from the hadal zone of the Northwest Pacific Ocean, including the Kuril–Kamchatka and Japan Trenches.

Notoliparis kermadecensis is a species of snailfish (Liparidae) that lives in the deep sea. Endemic to the Kermadec Trench in the Southwest Pacific, it is hadobenthic with a depth range between 6,474 and 7,561 m (21,240–24,806 ft), and can reach a standard length of up to 25.8 cm (10.2 in).

<i>Paraliparis</i> Genus of fishes

Paraliparis is a genus of fish in the family Liparidae, the snailfishes. It is found in benthic, benthopelagic and pelagic habitats in all the world's oceans.

<i>Careproctus</i> Genus of fishes

Careproctus is a genus of snailfishes found in benthic and benthopelagic habitats in the Atlantic, Pacific, Arctic and Southern Oceans. Whether they truly are absent from the Indian Ocean is unknown and might be an artifact of limited sampling. They range from shallow coastal seas in the far north of their range to the abyssal zone, at depths of 6 to 5,459 m (20–17,910 ft). In the Northern Hemisphere they mostly live shallower than Paraliparis, but this pattern is reversed in the Southern Hemisphere. Although almost entirely restricted to very cold waters, a single species, C. hyaleius, lives at hydrothermal vents.

Careproctus pallidus is a species of snailfish found around Tierra del Fuego in the far south of South America.

<i>Liparis fabricii</i> Species of fish

Liparis fabricii, commonly known as the gelatinous seasnail or gelatinous snailfish, is a benthopelagic species of snailfish from the Arctic Ocean. It has a tadpole-like body with a maximum length of about 20 cm (7.9 in). It is brown to black in coloration with a distinctive dark peritoneum. It preys on small crustaceans and marine worms. It is not commercially important, though it is a valuable food source for predatory fish and seabirds in the Arctic region.

Anatoly Petrovich Andriyashev was a Soviet and Russian ichthyologist, marine biologist, and zoogeographist, notable for his studies of marine fauna of the Arctic and the Northern Pacific.

<i>Pseudoliparis</i> (fish) Genus of fishes

Pseudoliparis is a genus of snailfishes native to very deep water in the northwestern Pacific Ocean.

Volodichthys is a genus of snailfishes found in deep water, more than 750 m (2,460 ft), of southern oceans near Antarctica and southern South America. Its members were formerly included in the genus Careproctus.

<i>Pseudoliparis swirei</i> Species of snailfish found at hadal depths in the Mariana Trench

Pseudoliparis swirei, the Mariana snailfish or Mariana hadal snailfish, is a species of snailfish found at hadal depths in the Mariana Trench in the western Pacific Ocean. It is known from a depth range of 6,198–8,076 m (20,335–26,496 ft), including a capture at 7,966 m (26,135 ft), which is possibly the record for a fish caught on the seafloor. Various anatomical, physiological, molecular and genetic adaptions help this species survive in such depths.

<span class="mw-page-title-main">Alan Jamieson</span> British marine biologist, engineer, explorer and author

Alan John Jamieson is a Scottish marine biologist, engineer, explorer and author, best known for his deep-sea exploration and study of life at the deepest places in the oceans. He is known for extensive use of deep-sea landers to establish the maximum depth and community dynamics of many organismal groups, as well as the discovery of many new species and highlighting the presence of anthropogenic impacts at full ocean depth. During the Five Deeps Expedition, and follow on expeditions in 2020, he completed various dives in a manned submersible to some of the deepest places in the world. He has published over 100 scientific papers and participated in 65 deep-sea expeditions.

<i>Paraliparis selti</i> Species of deep water snailfish

Paraliparis selti, the blue Atacama snailfish, is a species of deep water snailfish that is native to the south-east Pacific Ocean hadal zone 6,714 meters under water in the Atacama Trench. P. selti is 83 millimeters in length total and 75.9 millimeters in standard length. its one of the 200 species of snailfish discovered in the southern hemisphere.

Paraliparis acutidens is a species of snailfish found in the Atlantic Ocean, the Antarctic as well as the western part of the Scotia Sea.

Paraliparis mexicanus is a species of snailfish found along the Mexican coast of the eastern-central Pacific Ocean.

Paraliparis porcus is a species of snailfish found in the Atlantic part of Antarctic around Elephant Island.

Pseudoliparis belyaevi is a species of snailfish found in hadal zone of the Northwest Pacific Ocean, particularly the Japan Trench.

Careproctus spiraki, or pimpled snailfish, is a small, marine, bottom-dwelling snailfish. The type specimen was collected in a bottom trawl 457 meters deep in Seguam Pass in the Aleutian Islands. The species was first described to science by J. W. Orr in 2021.

<i>Careproctus maslenikovae</i> Species of fish

Careproctus maslenikovae, or blushing snailfish, is a small, marine, bottom-dwelling snailfish. The type specimen was collected in a bottom trawl 234 meters deep west of the Islands of Four Mountains in the Aleutian Islands. The species was first described to science by J. W. Orr in 2021.

<span class="mw-page-title-main">James Wilder Orr</span> American Ichthyologist

James Wilder Orr is an American fisheries biologist, ichthyologist, and systematist best known for his studies of skates, rockfishes, snailfishes, and flatfishes. He has described 32 new species and two new genera of fishes, and is the author or co-author of more than 130 scientific and popular articles, including three books. His work has focused primarily on the phylogenetic relationships, zoogeography, reproductive biology, and behavior of marine teleosts, particularly deep-water benthic taxa. He has spent most of his career at the Alaska Fisheries Science Center, National Marine Fisheries Service (NMFS), in Seattle, as a Research Fisheries Biologist. At the same time, he has served as an Affiliate Professor at the School of Aquatic and Fishery Sciences, and Affiliate Curator of Fishes at the Burke Museum of Natural History and Culture, University of Washington, Seattle. For his lifetime of service, Orr was presented with a National Oceanic and Atmospheric Administration (NOAA) Distinguished Career Award in 2022.

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