Richardson's Skate, Bathyraja richardsoni (Garrick 1961)


Other Names: Deepsea Skate, Richardson’s Ray

Richardson's Skate, Bathyraja richardsoni, about 100 nautical miles off the coast of southern Tasmania. Source: CSIRO Marine and Atmospheric Research. License: CC BY Attribution-Noncommercial

Summary:
A large uniform grey to brown skate with a diamond-shaped disc that is deeply incised behind the eyes, and pelvic fins that noticeably protrude and are positioned almost wholly behind the disc. Richardson's Skate lacks large thorns on its disc and on the anterior part of its tail. Mature males have prominent alar thorns on the outer dorsal edges of the pectoral fins, and very long claspers.

Cite this page as:
Bray, D.J. 2018, Bathyraja richardsoni in Fishes of Australia, accessed 27 Mar 2019, http://fishesofaustralia.net.au/home/species/2737

Richardson's Skate, Bathyraja richardsoni (Garrick 1961)

More Info


Distribution

Seamounts south of Tasmania, including the South Tasman Rise. Elsewhere the species occurs in New Zealand and the North Atlantic. This bathydemersal species inhabits the continental slope, submarine rises, and deepwater plains at depths to almost 3000 m.

Features

Disc diamond-shaped, deeply incised behind eyes; pelvic fin noticeably protruding, positioned almost wholly behind disc; head broadly triangular; snout pointed; mouth very wide, eyes far apart; snout length/interorbital distance ratio 1.2-1.7; dorsal fins joined, with no gap or intervening thorn; tail very short, 0.7-0.8 times body length; no large thorns on disc; mid-dorsal row of 15-20 thorns on tail only; upper surface entirely covered in fine spinules; lower surface with fine spinules covering snout, abdomen, and underside of tail.

Colour

Uniform brownish-grey above; ventral surface similar with pale markings along midline, on pelvic fins, and underside of tail. 

Feeding

Feeds mostly on fishes, and also consumes some crustaceans.

Biology

Females first mature at 159-174 cm TL; males at 120-142 cm TL. An oviparous species (egg layer), with the young born at 18.2−24.5 cm TL.

Species Citation

Raja richardsoni Garrick 1961, Trans. Roy. Soc. N. Z. 88(4): 746. Type locality: South of Cape Palliser, Cook Strait, New Zealand, 47°07'S, 174°57'E.

Author

Bray, D.J. 2018

Resources

Australian Faunal Directory

Richardson's Skate, Bathyraja richardsoni (Garrick 1961)

References


Dulvy, N.K. & Reynolds, J.D. 1997. Evolutionary transitions among egg-laying, live-bearing and maternal inputs in sharks and rays. Proc. R. Soc. Lond., Ser. B: Biol. Sci. 264: 1309-1315.

Garrick, J.A.F. 1961. Studies on New Zealand Elasmobranchii. Part XIII- A new species of Raja from 1,300 fathoms. Transactions of the Royal Society of New Zealand 88(4): 743-748 

Henry, L.A., Stehmann, M.F., De Clippele, L., Findlay, H.S., Golding, N. & Roberts, J.M. 2016. Seamount egg-laying grounds of the deep-water skate Bathyraja richardsoni. Journal of Fish Biology 89(2): 1473-1481 https://doi.org/10.1111/jfb.13041

Kulka, D.W., Orlov, A. & Barker, A.S. 2015. Bathyraja richardsoni. The IUCN Red List of Threatened Species 2015: e.T63127A70709214. http://dx.doi.org/10.2305/IUCN.UK.2015-4.RLTS.T63127A70709214.en. Downloaded on 11 July 2018.

Kyne, P.M. & Simpfendorfer, C.A. 2010. Deepwater chondrichthyans, pp. 37–114 in Carrier, J.C., Musick, J.A. & Heithaus, M.R. (eds) Sharks and Their Relatives II: Biodiversity, Adaptive Physiology and Conservation. Boca Raton, FL: CRC Press.

Last, P.R. & Stevens, J.D. 2009. Sharks and Rays of Australia. Collingwood : CSIRO Publishing Australia 2, 550 pp. 

Last, P.R., Stewart, A.L. & Séret , B. 2016. A new temperate deepwater skate of the genus Bathyraja (Rajoidei: Arhynchobatidae) from the South-West Pacific. Zootaxa 4132(1): 107-117.

Last, P.R., Stehmann, M.F.W., Séret, B. & Weigmann, S. 2016. 20. Softnose Skates. Family Arhynchobatidae, pp. 346-472, in Last, P.R., White, W.T., Carvalho, M.R. de, Séret, B., Stehmann, M.F.W. & Naylor, G.J.P. (eds.) Rays of the World. Clayton South, Victoria : CSIRO Publishing 790 pp.

McEachran, J.D. & Dunn, K.A. 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2): 271-290.

Orlov, A.M. 2011. Record of a tailless Richardson's ray Bathyraja richardsoni (Garrick, 1961) (Rajiformes: Arhynchobatidae) caught off the Mid-Atlantic ridge. Pan-American Journal of Aquatic Sciences 6(3): 232-236

Patterson, H. & Mazur, K. 2014. South Tasman Rise Trawl Fishery,pp. 281-285 in Georgeson, L., Stobutzki, I. & Curtotti, R. (eds) Fishery status reports 2013-14. Australian Bureau of Agricultural and Resource Economics and Sciences, Canberra.

Stehmann, M.F.W. 2005. Bathyraja ishiharai n. sp., a new deep-water skate from the eastern Indian Ocean on the Naturalist Plateau off southwestern Australia (Elasmobranchii, Rajiformes, Rajidae). Journal of Ichthyology 45, suppl. 1: S39-S57.

Stehmann, M.F.W. & Merrett, N.R. 2001. First record of advanced embryos and egg capsules of Bathyraja skates from the deep north-eastern Atlantic. Journal of Fish Biology 59: 338-349.

Stewart, A.L.& Last, P.R. 2015. 32 Family Arhynchobatidae, pp. 180-195. In Roberts, C.D., Stewart, A.L. & Struthers, C.D. The Fishes of New Zealand. Wellington : Te Papa Press Vol. 2 pp. 1-576.

Tempelman, W. 1973. First records, description, distribution, and notes on the biology of Bathyraja richardsoni (Garrick) from the Northwest Atlantic. Journal of Fisheries Research Board of Canada 30: 1831-1840.

Templeman, W. 1973. The skate, Raja richardsoni Garrick 1961, assigned to Bathyraja. Journal of the Fisheries Research Board of Canada 30: 1729-1732

Weigmann, S. 2016, Annotated checklist of the living sharks, batoids and chimaeras (Chondrichthyes) of the world, with a focus on biogeographical diversity. Journal of Fish Biology 88(3): 837-1037

Quick Facts


CAAB Code:37031046

Conservation:IUCN Least Concern

Depth:1370-2990 m

Habitat:Bathydemersal

Max Size:175 cm TL

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Species Maps

CAAB distribution map