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Scientists Discover New Species in One of World’s Deepest Ocean Trenches

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The findings by a team of marine biologists from Aberdeen, Tokyo and New Zealand, have shed new light on life in the deepest places on Earth and the global distribution of fish in our oceans. The expedition to the Peru-Chile trench in the South East Pacific Ocean revealed a new species of snailfish living at 7000m, never before caught or captured on camera. Mass groupings of cusk-eels and large crustacean scavengers were also discovered living at these depths for the first time. During the three-week expedition on the research vessel Sonne, the team of scientists employed state-of-the-art deep-sea imaging technology, including an ultra-deep free-falling baited camera system, to take a total of 6000 images between 4500 and 8000 metres deep within the trench. The expedition is the seventh to take place as part of HADEEP -- a collaborative research project between the University of Aberdeen's Oceanlab and the University of Tokyo's Ocean Research Institute, with support from New Zealand's National Institute of Water and Atmospheric research institute (NIWA). The HADEEP team has been investigating extreme depths across the globe for 3 years. Their findings to date have included capturing the world's deepest fish on camera for the first time. These latest discoveries provide a new insight into the depths at which fish survive and the diversity of populations which could exist in the deepest points of oceans across the globe. Dr Alan Jamieson from the University of Aberdeen's Oceanlab, who led the expedition said: "Our findings, which revealed diverse and abundant species at depths previously thought to be void of fish, will prompt a rethink into marine populations at extreme depths. "This expedition was prompted by our findings in 2008 and 2009 off Japan and New Zealand where we discovered new species of snailfish known as Liparids -- inhabiting trenches off Japan and New Zealand at depths of approximately 7000m -- with each trench hosting its own unique species of the fish. "To test whether these species would be found in all trenches, we repeated our experiments on the other side of the Pacific Ocean off Peru and Chile, some 6000 miles from our last observations. "What we found was that indeed there was another unique species of snailfish living at 7000m -- entirely new to science, which had never been caught or seen before. "A species of cusk-eel -- known as Ophidiids -- also gathered at our camera and began a feeding frenzy that lasted 22 hours -- the entire duration of the deployment. "Further research needs to be conducted to decipher whether this is also an entirely new species of cusk-eel that we have discovered. "Our investigations also revealed a species of crustacean scavengers -- known as amphipods -- which we previously did not know existed at these depths in such great numbers. Dr Niamh Kilgallen, an amphipod expert from NIWA said:"The sheer abundance of these big amphipods was overwhelming, particularly at 7000 and 8000m, which is much deeper than they have been found in any other trench. It begs the question of why and how they can live so deep in this trench but not in any other." Dr Toyonobu Fujii, a deep-sea fish expert from the University of Aberdeen said "How deep fish can live has long been an intriguing question and the results from this expedition has provided deeper insight into our understanding of the global distribution of fish in the oceans." Dr Jamieson added: "These findings prompt a re-evaluation of the diversity and abundance of life at extreme depths. Furthermore, it is now apparent that each of the deep trenches across the globe hosts a unique assembly of animals which can differ greatly from trench to trench. The immense isolation of each trench draws parallels with island evolution theory popularised by Darwin's finches." The HADEEP project is funded by the Nippon Foundation, Japan, and NERC, UK.
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Snailfish

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"
Liparis catharus

The Liparidae, commonly known as snailfish or sea snails,[1] are a family of scorpaeniform marine fishes.

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] They are closely related to the sculpins (family Cottidae) and lumpfish (family Cyclopteridae). In the past, snailfish were sometimes included within the latter family.

Description

The snailfish family is poorly studied and few specifics are known. Their elongated, tadpole-like bodies are similar in profile to the rattails. Their heads are large (compared to their size) with small eyes; their bodies are slender to deep, tapering 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; 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.

The pectoral fins are large and provide the snailfish with its primary means of locomotion although they are fragile. They are benthic fish with pelvic fins modified to form an adhesive disc; this nearly circular disc is absent in Paraliparis and Nectoliparis species. 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 11 kg (24 lb), but most species are smaller. Snailfish are of no interest to commercial fisheries.

Occurrence and habitat

The habitats chosen by snailfish are as widely variable as their size. They are found in oceans worldwide, ranging from shallow intertidal zones to depths of slightly more than 8,000 m (26,000 ft). This is a wider depth range than any other family of fish.[4] They are strictly found in cold waters, meaning that species of tropical and subtropical regions strictly are deepwater.[3][4][5] They are common in most cold marine waters and are highly resilient, with some species having antifreeze proteins.[6] It is the most species-rich family of fish in the Antarctic region, where generally found in relatively deep waters (shallower Antarctic waters are dominated by Antarctic icefish).[7]

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.[8] Other species are found on muddy or silty bottoms of continental slopes.

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.[9] 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,[10] and extended in May 2017 when another was filmed at a depth of 8,178 m (26,831 ft) in the Mariana Trench.[4][11] 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).[4][12] In general, snailfish (notably genera Notoliparis and Pseudoliparis) are the most common and dominant fish family in the hadal zone.[12] 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).[13]

Reproduction and life span

Reproductive strategies vary extensively among the species. As far as known, all species lay eggs that are relatively large in size (diameter up to 9.4 mm or 0.37 in).[4] The number of eggs varies extensively depending on species.[14] Some deposit their egg mass among cold-water corals, kelp or stones.[3][15] It is possible that the male guards the egg mass.[15] At least one species, Careproctus ovigerus of the North Pacific, is known to practice mouth brooding; that is, the male of the species 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.[3] After the eggs hatch, some species rapidly reach the adult size and only live for about one year,[15] but others have life spans of more than a decade.[16]

Diet

The diet of snailfish consists primarily of small benthic crustaceans, mollusks, polychaete worms, and other small invertebrates. Some species are also piscivorous. Specialist species such as Paraliparis rosaceus feed exclusively on sea cucumbers.

Genera

This family currently contains these genera:[2]

References

  1. ^ "The Sea Snails. Family Liparidae". Gulf of Maine Research Institute. Retrieved March 6, 2012.
  2. ^ a b Froese, Rainer, and Daniel Pauly, eds. (2015). "Liparidae" in FishBase. February 2015 version.
  3. ^ a b c d Gardner, J.R.; J.W. Orr; D.E. Stevenson; I. Spies; D.A. Somerton (2016). "Reproductive Parasitism between Distant Phyla: Molecular Identification of Snailfish (Liparidae) Egg Masses in the Gill Cavities of King Crabs (Lithodidae)". Copeia. 104 (3): 645–657. doi:10.1643/CI-15-374.
  4. ^ a b c d e Gerringer, M.E.; T.D. Linley; P.H. Yancey; A.J. Jamieson; E. Goetze; J.C. Drazen (2016). "Pseudoliparis swirei sp. nov.: A newly-discovered hadal snailfish (Scorpaeniformes: Liparidae) from the Mariana Trench". Zootaxa. 4358 (1): 161–177. doi:10.11646/zootaxa.4358.1.7. PMID 29245485.
  5. ^ Sakurai, H.; G. Shinohara (2008). "Careproctus rotundifrons, a New Snailfish (Scorpaeniformes: Liparidae) from Japan". Bull. Natl. Mus. Nat. Sci. Ser. A (Suppl. 2): 39–45.
  6. ^ Evans, R.E.; G.L. Fletcher (2001). "Isolation and characterization of type I antifreeze proteins from Atlantic snailfish (Liparis atlanticus) and dusky snailfish (Liparis gibbus)". Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology. 1547 (Suppl. 2): 235–244. doi:10.1016/S0167-4838(01)00190-X. PMID 11410279.
  7. ^ Eastman, J.T.; M.J. Lannoo (1998). "Morphology of the Brain and Sense Organs in the Snailfish Paraliparis devriesi: Neural Convergence and Sensory Compensation on the Antarctic Shelf". Journal of Morphology. 237 (3): 213–236. doi:10.1002/(sici)1097-4687(199809)237:3<213::aid-jmor2>3.0.co;2-#.
  8. ^ Hogan, C.M. (2011): Norwegian Sea. Encyclopedia of Earth. Eds. Saundry, P. & Cleveland, C.J. National Council for Science and the Environment. Washington DC
  9. ^ Morelle, R. (2008). "'Deepest ever' living fish filmed". BBC News.
  10. ^ Morelle, Rebecca (2014-12-19). "New record for deepest fish". BBC News. Retrieved 2017-08-26.
  11. ^ "Ghostly fish in Mariana Trench in the Pacific is deepest ever recorded". CBC News. 2017-08-25. Retrieved 2017-08-26.
  12. ^ a b Linley, T.D.; M.E. Gerringer; P.H. Yancey; J.C. Drazen; C.L. Weinstock; A.J. Jamieson (2016). "Fishes of the hadal zone including new species, in situ observations and depth records of Liparidae". Deep Sea Research Part I: Oceanographic Research Papers. 114: 99–110. Bibcode:2016DSRI..114...99L. doi:10.1016/j.dsr.2016.05.003.
  13. ^ Gerringer, M.E.; A.H. Andrews; G.R. Huus; K. Nagashima; B.N. Popp; T.D. Linley; N.D. Gallo; M.R. Clark; A.J. Jamieson; J.C. Drazen (2017). "Life history of abyssal and hadal fishes from otolith growth zones and oxygen isotopic compositions". Deep Sea Research Part I: Oceanographic Research Papers. 132: 37–50. Bibcode:2018DSRI..132...37G. doi:10.1016/j.dsr.2017.12.002.
  14. ^ Stein, D.L. (1980). "Aspects of Reproduction of Liparid Fishes from the Continental Slope and Abyssal Plain off Oregon, with Notes on Growth". Copeia. 1980 (4): 687–699. doi:10.2307/1444445. JSTOR 1444445.
  15. ^ a b c Kawasaki, I.; J. Hashimoto; H. Honda; A. Otake (1983). "Selection of Life Histories and its Adaptive Significance in a Snailfish Liparis tanakai from Sendai Bay". Bulletin of the Japanese Society of Scientific Fisheries. 49 (3): 367–377. doi:10.2331/suisan.49.367.
  16. ^ Orlov, A.M.; A.M. Tokranov (2011). "Some Rare and Insufficiently Studied Snailfish (Liparidae, Scorpaeniformes, Pisces) in the Pacific Waters off the Northern Kuril Islands and Southeastern Kamchatka, Russia". ISRN Zoology. 201: 341640. doi:10.5402/2011/341640.
  17. ^ Stein D.L. (2012). "A Review of the Snailfishes (Liparidae, Scorpaeniformes) of New Zealand, Including Descriptions of a New Genus and Sixteen New Species". Zootaxa. 3588: 1–54. doi:10.11646/zootaxa.3588.1.1.
  18. ^ Balushkin A.V. (2012). "Volodichthys gen. nov. New Species of the Primitive Snailfish (Liparidae: Scorpaeniformes) of the Southern Hemisphere. Description of New Species V. solovjevae sp. nov. (Cooperation Sea, the Antarctic)". Journal of Ichthyology. 52 (1): 1–10. doi:10.1134/s0032945212010018.

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Snailfish: Brief Summary

provided by wikipedia EN
" Liparis marmoratus " Liparis catharus " Liparis fabricii

The Liparidae, commonly known as snailfish or sea snails, are a family of scorpaeniform marine fishes.

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, but there are also many undescribed species. They are closely related to the sculpins (family Cottidae) and lumpfish (family Cyclopteridae). In the past, snailfish were sometimes included within the latter family.

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