Overview

Distribution

Range Description

This species occurs off the Pacific coast of Japan: from Choshi, Honshu to the east coast of Kyushu (Holthuis 1991).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is found in mud substrate at depths of 200-440 m, preferring 200-300 m (Holthuis 1991).

Systems
  • Marine
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Dispersal

Depth range

from 200 to 440m, usually between 200 and 300m
  • Holthuis, L.B. 1991. FAO species catalogue. Vol 13. Marine lobsters of the world. An annotated and illustrated catalogue of species of interest to fisheries known to date. FAO fisheries Synopsis. 125 (13):292 p.
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2011

Assessor/s
Butler, M., Chan, T.Y., Cockcroft, A., 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
Metanephrops japonicus has been assessed as Data Deficient. Further information on the impact of commercial exploitation on its population size and trends is required. This species is harvested throughout much of its range. Despite anecdotal and observational evidence from fishermen about population declines, there is a lack of quantitative data from which to quantify rates of decline. Further research is recommended to determine the abundance of this species and the impact of trawling before a more accurate assessment of conservation status can be made.
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Population

Population
There is no population information for this species.

Population Trend
Unknown
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Threats

Major Threats
The stock of Sagami Bay appears not to be large, and is threatened by high fishing pressure. So far this has not caused a significant change in the size distribution of the catch, although this may be due to the aggregating nature of this species into size groups (Chan and Yu 1991). Over-fishing has resulted in decreased numbers. Rearing of juveniles in captivity has been successful (Okamoto 2008). However the lack of catch per unit effort data makes it difficult to interpret these observations.
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species. Studies have investigated captive rearing of this species with some success (Okamoto 2005, 2008). This is part of a project initiated to develop land-based aquaculture in order to restock overfished areas (e.g., Suruga Bay); something which has not been achieved with any nephropid lobster (Okamoto 2008).
Further work is needed to determine the impact of trawling on populations, especially those which might be affected by high fishing pressure. If there is evidence that populations are being severely impacted further measures may need to be introduced (if not already in place) to limit the size and/or timing of catches. These include: license limitation; vessel restrictions; seasonal closures or periods of no fishing and minumum size limits. Although Chan and Yu (1991) reported no change in size distribution in harvested populations.
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Wikipedia

Metanephrops japonicus

Metanephrops japonicus is a species of lobster found in Japanese waters, and a gourmet food in Japanese cuisine.[2] It occurs from Chōshi, Chiba Prefecture (Honshu) to the east coast of Kyushu, where it lives at depths of 200–440 metres (660–1,440 ft).[2] Adults grow to a total length of 9–12 centimetres (3.5–4.7 in), and a carapace length of 3–7 cm (1.2–2.8 in).[2]

Metanephrops japonicus served in a creamy butter sauce

References[edit]

  1. ^ M. Butler, T. Y. Chan, A. Cockcroft, A. MacDiarmid & R. Wahle (2011). "Metanephrops japonicus". IUCN Red List of Threatened Species. Version 2011.2. International Union for Conservation of Nature. Retrieved January 1, 2012. 
  2. ^ a b c Lipke B. Holthuis (1991). "Metanephrops japonicus". Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. p. 74. ISBN 92-5-103027-8. 
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