Overview

Comprehensive Description

Biology

Benthic (Ref. 51024). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205).
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Distribution

Range Description

Western central Atlantic: Recorded from southern Florida, Cuba, southern Gulf of Mexico, and eastern Yucatán (McEachran and Carvalho 2002).
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Western Central Atlantic: Florida, USA to Yucatan, Mexico.
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Western Atlantic.
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Physical Description

Size

Maximum size: 510 mm TL
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Max. size

51.0 cm TL (male/unsexed; (Ref. 2850))
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Diagnostic Description

Disc broadly rounded. Upper surface of disk is pale and has dark spots. Ocellus on each pectoral fin usually oval. Ocelli are closer (Ref. 7251). Lower surface white without dark markings (Ref. 6902).
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Type Information

Type for Raja ackleyi
Catalog Number: USNM 43726
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Illustration
Collector(s): Museum of Comparative Zoology (MCZ), Harvard University
Locality: No Data
  • Type:
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
A demersal species found along the continental shelf and upper slope from 32?384 m depth (McEachran and Carvalho 2002).This species reaches a maximum size of at least 41 cm total length (TL) and mature males have been known at 41 cm TL (McEachran and Carvalho 2002), but may mature at a smaller size). It is presumably oviparous as in other skates, but little else is known of its biology.

Systems
  • Marine
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Environment

demersal; marine, usually ? - 45 m (Ref. 7251)
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Depth range based on 3 specimens in 1 taxon.
Water temperature and chemistry ranges based on 2 samples.

Environmental ranges
  Depth range (m): 46 - 744
  Temperature range (°C): 22.489 - 25.553
  Nitrate (umol/L): 1.665 - 1.939
  Salinity (PPS): 36.197 - 36.286
  Oxygen (ml/l): 4.449 - 4.751
  Phosphate (umol/l): 0.143 - 0.144
  Silicate (umol/l): 1.461 - 2.688

Graphical representation

Depth range (m): 46 - 744

Temperature range (°C): 22.489 - 25.553

Nitrate (umol/L): 1.665 - 1.939

Salinity (PPS): 36.197 - 36.286

Oxygen (ml/l): 4.449 - 4.751

Phosphate (umol/l): 0.143 - 0.144

Silicate (umol/l): 1.461 - 2.688
 
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Life History and Behavior

Life Cycle

Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).
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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
2009

Assessor/s
Cronin, E.S.

Reviewer/s
Valenti, S.V. & Sulikowski, J. (Shark Red List Authority)

Contributor/s

Justification
The Ocellate Skate (Raja ackleyi) is a little known demersal skate found along the continental shelf and upper slope from 32?384 m depth off southern Florida, Cuba, southern Gulf of Mexico, and eastern Yucatán. It reaches at least 41 cm total length (TL), but little else is known of its biology. It is a potential bycatch of shrimp trawl fisheries operating on the shelf, but no specific information is available on its capture. Insufficient information is available to assess this species beyond Data Deficient at present. Bycatch levels should be quantified and monitored and this species should be reassessed when further information becomes available.
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Population

Population
Population size is unknown.

Population Trend
Unknown
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Threats

Major Threats
This species may be taken as bycatch by shrimp trawl fisheries, although no information on catches is available.
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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions
There are no specific conservation measures in place at this time. Like many deepwater species, further biological, range and fisheries data are required to assess any future conservation needs. Where taken, catches require monitoring, particularly as deepwater fisheries expand worldwide.

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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