Overview

Comprehensive Description

Biology

Oceanic, usually living deeper than 500 m during the day. Smaller individuals migrate to the surface at night. Possibly feeding on crustaceans and fishes (Ref. 58426). Minimum depth from Ref. 58018.
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Distribution

south slope of Georges Bank to the Bahamas
  • North-West Atlantic Ocean species (NWARMS)
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Range Description

This species occurs from Mauritania to central Namibia. It has also been found in the western Atlantic by Georges Bank (Moore et al. 2003), the Gulf of Mexico, the Bahamas and across the Atlantic. One specimen is known from the southwest Atlantic (25°27'S, 35°56'W).
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Eastern Atlantic: Mauritania south to Angola; reported from central Namibia (Ref. 27121). Western Atlantic: Gulf of Mexico and Bahamas area; and across the Atlantic (20°N-10°S). One specimen known from the southwest Atlantic (25°27'S, 35°56'W).
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Atlantic.
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Physical Description

Morphology

Dorsal soft rays (total): 15 - 17; Analsoft rays: 12 - 15
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Size

Maximum size: 159 mm SL
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Max. size

15.9 cm SL (male/unsexed; (Ref. 4465))
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Diagnostic Description

Barbel without pigment, tapering to end, lacking swelling or bulb (Ref. 37473). Body moderately elongate and slender. Maxillary teeth closely spaced. Serial photophores not broken into small groups. Luminous patches present on margin of operculum. Black in color (Ref. 37039).
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Ecology

Habitat

nektonic
  • North-West Atlantic Ocean species (NWARMS)
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Habitat and Ecology

Habitat and Ecology
Astronesthes richardsoni is a mesopelagic species that is thought to occur at depths of up to 1,000m. It is thought that, like most species of this genus, it tends to live deeper than 500m during the day. Some, particularly smaller individuals, migrate up the water column to feed at night (Gibbs 1984). Its diet may consist of smaller fishes and crustaceans.

Systems
  • Marine
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Environment

bathypelagic; oceanodromous (Ref. 51243); marine; depth range 275 - 1000 m (Ref. 58426)
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Depth range based on 24 specimens in 1 taxon.
Water temperature and chemistry ranges based on 12 samples.

Environmental ranges
  Depth range (m): 103.5 - 1900
  Temperature range (°C): 3.528 - 20.166
  Nitrate (umol/L): 5.476 - 36.323
  Salinity (PPS): 34.815 - 36.687
  Oxygen (ml/l): 1.558 - 5.254
  Phosphate (umol/l): 0.398 - 2.386
  Silicate (umol/l): 2.444 - 27.741

Graphical representation

Depth range (m): 103.5 - 1900

Temperature range (°C): 3.528 - 20.166

Nitrate (umol/L): 5.476 - 36.323

Salinity (PPS): 34.815 - 36.687

Oxygen (ml/l): 1.558 - 5.254

Phosphate (umol/l): 0.398 - 2.386

Silicate (umol/l): 2.444 - 27.741
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Migration

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
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Trophic Strategy

ceanic, usually living deeper than 500 m during the day. Smaller individuals migrate to the surface at night. Possibly feeding on crustaceans and fishes (Ref. 58426).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Astronesthes richardsoni

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 10
Species With Barcodes: 1
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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
2010

Assessor/s
Collen, B., Richman, N. & Ram, M. (Sampled Red List Index Coordinating Team)

Reviewer/s
Polidoro, B., Elfes, C. & Carpenter, K.E.

Contributor/s
De Silva, R., Milligan, H., Lutz, M., Batchelor, A., Jopling, B., Kemp, K., Lewis, S., Lintott, P., Sears, J., Wilson, P., Smith, J. & Livingston, F.

Justification
Astronesthes richardsoni has been assessed as Least Concern. This broad ranging species is not known to have any major threats. It is likely that the population is not undergoing significant population declines.
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Population

Population
There is no known population information for Astronesthes richardsoni.

Population Trend
Unknown
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Threats

Major Threats
There is no directed fishery for this species. Due to the deepwater and oceanic nature of this species it is unlikely to be impacted by coastal development and pollution from urban centres.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place, or needed, for Astronesthes richardsoni.
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