Overview

Comprehensive Description

Biology

Oviparous (Ref. 205). Eggs are encased in horny shells (Ref. 205).
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Distribution

Range Description

Occurs throughout the Gulf of Mexico and Caribbean (range is roughly 29° to 07°N and 54° to 92°W). Reported as far south as Suriname, but these records need to be confirmed (Bigelow and Schroeder 1951, 1953, McEachran and Fechelm 1989, Krefft 1990, Didier 2002). Museum specimens and accompanying capture records of this species from the Northwest Shelf, Western Australia (Indian Ocean) are most probably a misidentification.
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Eastern Atlantic: Western Sahara and northern Mauritania. Western Atlantic: off Florida, USA (Ref. 4443) and off Suriname (Ref. 13608).
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Western Atlantic, from the Gulf of Mexico to Suriname, and in southeastern Brazil.
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Physical Description

Size

Maximum size: 540 mm SL
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Max. size

54.0 cm SL (male/unsexed; (Ref. 4443))
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Diagnostic Description

Long caudal filament. Shorter dorsal spine, longer pectorals and a wavy lateral line. Dark brownish on head and body, fins much darker (Ref. 6902).
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Type Information

Paratype for Hydrolagus alberti
Catalog Number: USNM 153559
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1951
Locality: Gulf of Mexico: Off Pensacola, Florida., Escambia County, Florida, United States, Gulf of Mexico, Atlantic
Depth (m): 558 to 558
Vessel: Oregon
  • Paratype:
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Type for Hydrolagus alberti
Catalog Number: USNM 153558
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1951
Locality: Gulf of Mexico: Off Pensacola, Florida., Escambia County, Florida, United States, Gulf of Mexico, Atlantic
Depth (m): 558 to 558
Vessel: Oregon
  • Type:
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Found in deep waters of the continental slopes at depths of 348 to 1,100 m. Oviparous, but nothing is known of reproductive biology. Maximum recorded size 96 cm TL (42 cm BDL); both males and females appear to reach sexual maturity at ~35 cm BDL.

Life history parameters
Age at maturity (years): Unknown.
Size at maturity (body length): ~35 cm BDL (estimate) (male & female).
Longevity (years): Unknown.
Maximum size (total/body length): 96 cm TL; 42 cm BDL.
Size at birth (cm): Unknown.
Average reproductive age (years): Unknown.
Gestation time (months): Unknown.
Reproductive periodicity: Unknown.
Average annual fecundity or litter size: Unknown.
Annual rate of population increase: Unknown.
Natural mortality: Unknown.

Systems
  • Marine
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Environment

bathydemersal; marine; depth range 570 - 1470 m (Ref. 4443)
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Depth range based on 79 specimens in 1 taxon.
Water temperature and chemistry ranges based on 26 samples.

Environmental ranges
  Depth range (m): 366 - 1007
  Temperature range (°C): 4.756 - 11.677
  Nitrate (umol/L): 18.424 - 34.243
  Salinity (PPS): 34.582 - 35.517
  Oxygen (ml/l): 2.604 - 4.920
  Phosphate (umol/l): 1.229 - 2.248
  Silicate (umol/l): 10.612 - 28.118

Graphical representation

Depth range (m): 366 - 1007

Temperature range (°C): 4.756 - 11.677

Nitrate (umol/L): 18.424 - 34.243

Salinity (PPS): 34.582 - 35.517

Oxygen (ml/l): 2.604 - 4.920

Phosphate (umol/l): 1.229 - 2.248

Silicate (umol/l): 10.612 - 28.118
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Depth: 570 - 1470m.
From 570 to 1470 meters.

Habitat: bathydemersal. Captured by otter trawl.
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Life History and Behavior

Life Cycle

Oviparous (Ref. 205).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Hydrolagus alberti

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
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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
2006

Assessor/s
Dagit, D.D.

Reviewer/s
Kyne, P.M., Fowler, S.L. & Compagno, L.J.V. (Shark Red List Authority)

Contributor/s

Justification
A deepwater species found at depths of 348 to 1,100 m with reported captures from the Gulf of Mexico and the Caribbean. Not commonly captured due to its deepwater habitat, which may be outside the range of deepwater fisheries in the region. However, it may face the threat of capture in the future as bycatch in longline and trawl fisheries, if effort is increased in deeper waters within the region. Probably widespread throughout the Gulf of Mexico and Caribbean to the northern part of South America. Nothing is known of population structure or reproductive biology, although the capture of predominately juveniles indicates that this species may segregate by size with adults occurring in different habitats or greater depths than juveniles. Insufficient information to assess the species beyond Data Deficient at this time.
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Population

Population
No information exists on population structure; however, most collections are of juveniles indicating that adults may aggregate separately from juveniles in different habitats or deeper waters.

Population Trend
Unknown
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Threats

Major Threats
Not known to be targeted in any fishery but is occasionally caught in research trawls and is likely to be caught as bycatch in commercial fisheries on some occasions. At present this species does not appear to be commonly caught probably due to its habitat outside the range of most fisheries in the region. However, it may face the threat of capture in the future as bycatch in longline and trawl fisheries, if effort is increased in deeper waters within the region.
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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions
No management or conservation efforts are currently in place. It is recommended that data on sex, size, and depth be recorded for all incidental catches in an effort to increase knowledge of population structure, size and life history.

The development and implementation of management plans (national and/or regional e.g., under the FAO International Plan of Action for the Conservation and Management of Sharks: IPOA?Sharks) are required to facilitate the conservation and management of all chondrichthyan species in the region.
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Wikipedia

Gulf chimaera

The gulf chimaera (Hydrolagus alberti) is a species of cartilaginous fish in the Chimaeridae family found near Mexico, the United States, and possibly Suriname. Its natural habitat is open seas. It is threatened by habitat loss.[1]

References[edit]

  1. ^ Dagit, D.D. 2005. Hydrolagus alberti. 2006 IUCN Red List of Threatened Species. Downloaded on 3 August 2007.
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