Overview

Distribution

Range Description

This species is known from the continental shelf of the Tristan da Cunha Islands (Inaccessible Is., Tristan Is., Nightingale Is., and Gough Is.) and the Vema Seamount, in the Southern Ocean (Holthuis 1991).
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Ecology

Habitat

Known from seamounts and knolls
  • Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.
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Source: World Register of Marine Species

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Habitat and Ecology

Habitat and Ecology
This species is found on rocky substrates, in kelp at a depth range of 0 - 200 m, although it is most commonly found between 20 - 40 m (Holthuis 1991).

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): 42 - 25000
  Temperature range (°C): 18.121 - 18.121
  Nitrate (umol/L): 0.169 - 0.169
  Salinity (PPS): 35.618 - 35.618
  Oxygen (ml/l): 5.423 - 5.423
  Phosphate (umol/l): 0.282 - 0.282
  Silicate (umol/l): 2.132 - 2.132

Graphical representation

Depth range (m): 42 - 25000
 
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2011

Assessor/s
Cockcroft, A., Butler, M., MacDiarmid, A. & Wahle, R.

Reviewer/s
Collen, B., Livingstone, S. & Richman, N.

Contributor/s
Batchelor, A., De Silva, R., Dyer, E., Kasthala, G., Lutz, M.L., McGuinness, S., Milligan, H.T., Soulsby, A.-M. & Whitton, F.

Justification
Jasus tristani has been assessed as Least Concern. Although this species is commercially fished, the fishery is thought to be in a stable state, and management restrictions are in place.
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Population

Population
This species is common within its range (A. MacDiarmid and A. Cockcroft pers. comm. 2009).

Population Trend
Stable
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Threats

Major Threats
This species is harvested commercially; however, this is not believed to pose a threat to this species (Pollock et al. 2000).
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Management

Conservation Actions

Conservation Actions
To manage the harvesting of this species the following restrictions are in place: total allowable commercial catch for each individual catch, as well as gear restrictions, and minimum size limits (A. MacDiarmid and A. Cockcroft pers. comm. 2009).
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Wikipedia

Tristan rock lobster

The Tristan rock lobster, Jasus tristani, is a species of rock lobster endemic to the Tristan da Cunha archipelago and Vema Seamount, 1,680 kilometres (1,040 mi) north-east of Tristan.[2] It is very closely related to J. paulensis and these two may represent a single species.[3] The Tristan rock lobster features on the coat of arms and the flag of Tristan da Cunha. Until 1950, the Tristan rock lobster was only fished for local consumption, but after that time, companies such as the South Atlantic Islands Development Corporation have exploited the rock lobster population. Production peaked in the 1970s, with over 800 tonnes being collected in some years, but the industry has since waned, with less than 400 t being caught most years since 1992.[4]

References

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