Trigonognathus kabeyai — Details

Viper Shark learn more about names for this taxon

Overview

Comprehensive Description

Biology

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Specimens collected between 330 and 360 m (Ref. 31259). Ovoviviparous (Ref. 205).
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Distribution

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Northwest Pacific: Wakayama and Tokushima, Japan (Ref. 31259). Reported from the Hawaiian Islands (Ref. 58302).
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Range Description

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Trigonognathus kabeyai is known from the Pacific Ocean (FAO areas 61 and 77). Limited area in Japan and one specimen collected from Hawaii.
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Western and Central Pacific: Japan, Hancock Seamount (Hawaiian Ridge).
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Physical Description

Size

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Maximum size: 372 mm TL
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Max. size

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47.0 cm TL (male/unsexed; (Ref. 55729)); 53.9 cm TL (female); max. published weight: 426 g (Ref. 55729); max. published weight: 760.0 g
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Ecology

Habitat

Environment

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bathydemersal; marine; depth range 330 - 360 m (Ref. 31259)
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Habitat and Ecology

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Habitat and Ecology
Upper continental slopes of southern Japan at depths of 330 to 360 m. Also on SE Hancock Seamount at bottom on uppermost slope (270 m). Thirty-nine specimens were collected from the the surface to a depth of 150 m, at night where the sea was more than 1,500 m deep, by purse seine in the Kumano-nada Sea. Seven specimens were found in stomach contents of Taractichthys steindachneri and Thunnus obesus from the Ogasawara Islands. Number of mature ova in both ovaries was 25 to 26. Myctophid fishes consisting of Diaphus gigas, Diaphus spp., Benthosema fibulatum and Benthosema sp. were the only identified prey in the stomachs. Most of the prey fishes were found almost intact and usually had puncture holes made by teeth. On the basis of stomach content and jaw morphology, this species is thought to be a ram feeder.

Systems
  • Marine
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Depth range based on 4 specimens in 1 taxon.
Water temperature and chemistry ranges based on 2 samples.

Environmental ranges
  Depth range (m): 268.8 - 360
  Temperature range (°C): 14.581 - 14.581
  Nitrate (umol/L): 7.983 - 7.983
  Salinity (PPS): 34.555 - 34.555
  Oxygen (ml/l): 4.891 - 4.891
  Phosphate (umol/l): 0.699 - 0.699
  Silicate (umol/l): 9.519 - 9.519

Graphical representation

Depth range (m): 268.8 - 360
 
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Depth: 330 - 360m.
From 330 to 360 meters.

Habitat: bathydemersal.
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Trophic Strategy

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Specimens collected between 330 and 360 m (Ref. 31259).
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Life History and Behavior

Life Cycle

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Distinct pairing with embrace (Ref. 205).
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Conservation

Conservation Status

IUCN Red List Assessment

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Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2004

Assessor/s
Yano, K.

Reviewer/s
Kyne, P.M., Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)

Justification
A rare deepsea shark with a limited distribution area in Japan and a single record from Hawaii. Recorded on or near the bottom and in mid-water. Reaches at least 54 cm total length (TL) but very little information available on biology. Taken as bycatch of bottom trawl and purse seine fisheries, but not utilised. At this time the species cannot be assessed beyond Data Deficient. If fisheries expand in the future catches of this species may increase and would need to be monitored.
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Population

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Population Trend
Unknown
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Threats

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Data deficient (DD)
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Major Threats
This species is a very rare bycatch of purse seine and bottom trawl nets. Local fisheries operate year-round.
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Management

Conservation Actions

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Conservation Actions
No conservation measures currently are in place for this species.
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Wikipedia

Viper dogfish

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The viper dogfish, Trigonognathus kabeyai, is a dogfish, the only species in the genus Trigonognathus, found off Wakayama and Tokushima, Japan, in the northwest Pacific Ocean at depths between 330 and 360 m. Its maximum length is 47 cm.

Viper dogfish are ovoviviparous.

References

External references

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