Overview

Distribution

Range Description

This species ranges from South Africa and Madagascar, through the Gulf of Thailand, South China Sea to Japan, Indonesia, and New Caledonia (Holthuis 2002). It may be distributed as far east as the Mariana Islands (Sekiguchi 1990). Larvae have also been recorded from the Houtman Abrolhos Islands off the coast of Western Australia (Pearce et al. 1992).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is found between 2-108 m, most commonly from 26 to 65 m (Holthuis 2002). Habitats include sandy bottoms with broken shells or dead coral, and less commonly coral reefs (Holthuis 2002). Larvae of this species show vertical diel migrations, occurring near the surface at night and between 40-100 m during the day (Booth et al. 2005). Spawning occurs between May and August in Japanese waters (Sekiguchi 1986).

Systems
  • Marine
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Depth range based on 17 specimens in 1 taxon.
Water temperature and chemistry ranges based on 8 samples.

Environmental ranges
  Depth range (m): 26 - 108
  Temperature range (°C): 15.696 - 25.093
  Nitrate (umol/L): 0.129 - 14.198
  Salinity (PPS): 34.267 - 35.631
  Oxygen (ml/l): 3.165 - 4.999
  Phosphate (umol/l): 0.123 - 0.567
  Silicate (umol/l): 0.748 - 18.589

Graphical representation

Depth range (m): 26 - 108

Temperature range (°C): 15.696 - 25.093

Nitrate (umol/L): 0.129 - 14.198

Salinity (PPS): 34.267 - 35.631

Oxygen (ml/l): 3.165 - 4.999

Phosphate (umol/l): 0.123 - 0.567

Silicate (umol/l): 0.748 - 18.589
 
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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
Chan, T.Y.

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
Crenarctus bicuspidatus has been assessed as Least Concern because it has a broad distribution and does not appear to be affected by any major threats (including commercial fisheries).
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Population

Population
Larvae of this species were predominant in lobster catches off the Pacific coast of central Japan, making up more than 90% of the catch (Sekiguchi 1986).

Population Trend
Unknown
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Threats

Major Threats
This species does not appear to be fished commercially in any part of its range, and levels of subsistence fishing are unknown.
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species.
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