Overview

Distribution

Range Description

This species has a geographic distribution along the north and northeast coast of Australia, ranging from the Gulf of Carpentaria in the west to Sydney in New South Wales (Reid et al. 2005).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This is a medium sized, demersal cuttlefish that often inhabits seagrass and seaweed beds in which it forages during the day for crustaceans and fish (Norman 2003, Reid et al. 2005). It can occur in very shallow water including the intertidal zone (Reid et al. 2005). It sometimes rests on the bottom using its arms like stilts (Reid et al. 2005). During mating the female displays no colour changes, in contrast to males that show colour patterns (Reid et al. 2005).

Systems
  • Marine
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Depth range based on 149 specimens in 1 taxon.
Water temperature and chemistry ranges based on 58 samples.

Environmental ranges
  Depth range (m): 10.0858 - 96.2231
  Temperature range (°C): 22.697 - 26.692
  Nitrate (umol/L): 0.395 - 3.632
  Salinity (PPS): 35.037 - 35.493
  Oxygen (ml/l): 4.032 - 4.793
  Phosphate (umol/l): 0.083 - 0.342
  Silicate (umol/l): 0.380 - 1.453

Graphical representation

Depth range (m): 10.0858 - 96.2231

Temperature range (°C): 22.697 - 26.692

Nitrate (umol/L): 0.395 - 3.632

Salinity (PPS): 35.037 - 35.493

Oxygen (ml/l): 4.032 - 4.793

Phosphate (umol/l): 0.083 - 0.342

Silicate (umol/l): 0.380 - 1.453
 
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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
2012

Assessor/s
Barratt, I. & Allcock, L.

Reviewer/s
Reid, A., Rogers, Alex & Bohm, M.

Contributor/s
Herdson, R. & Duncan, C.

Justification
Sepia plangon has been assessed as Least Concern as although it is sometimes caught as bycatch in the prawn and mixed trawl fisheries this likely has a minimal impact due to the wide distribution of this species.
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Population

Population
The population size of this species is unknown.

Population Trend
Unknown
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Threats

Major Threats
Ocean acidification caused by increased levels of carbon dioxide in the atmosphere is potentially a threat to all cuttlefish. Studies have shown that under high pCO2 concentrations, cuttlefishes actually lay down a denser cuttlebone which is likely to negatively affect buoyancy regulation (Gutowska et al. 2010). This species is caught as bycatch (Reid et al. 2005).
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Management

Conservation Actions

Conservation Actions
No conservation measures are currently needed for this species and none are in place. Further research is recommended regarding the population trends, distribution, life history traits and threats impacting this species.
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