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Family Rhinidae Wedgefishes /Guitarfishes

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Family Rhinidae Wedgefishes /Guitarfishes. Taxonomy. Order Rhiniformes (or Rajiformes?) Family Rhinidae (or Rhynchobatidae?) Genus Rhynchobatus R. djidennsis (giant guitarfish)* R.australiae (white-spotted guitarfish) R. laevis (smoothnose wedgefish)

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Presentation Transcript
slide1

Family Rhinidae

Wedgefishes /Guitarfishes

slide2

Taxonomy

Order Rhiniformes (or Rajiformes?)

Family Rhinidae (or Rhynchobatidae?)

Genus Rhynchobatus

R. djidennsis (giant guitarfish)*

R.australiae (white-spotted guitarfish)

R. laevis (smoothnose wedgefish)

R. leubberti (African wedgefish)

R. spp. nov. A (roughnose wedgefish)

R. spp. nov. B (broadnose wedgefish)

slide3

Morphology

seem to be intermediate between Pristidae and Rhinobatidae

elongated rostrum (without saw)

large, shark-like fins- 2 dorsal

batoid-like cephalic pectoral fins

slide4

Morphology

dorsoventrally flattened

large spiracles near the eyes

size: TL ~300cm

R. australiae- color morphs in Indonesia

different species?

undescribed spp.A- “dwarf” species- 82cm TL

slide5

Habitat and Distribution

Most: Indo-West-Pacific, especially Indonesia

R. luebberti- E. Atlantic

all species are inshore, coastal, usually ~35m deep

found near sandy beaches (KwaZulu-Natal, S. Africa)

and along reef edges

slide6

Reproduction

mature at 150cm TL, 60cm TL at birth

aplacental viviparous

~4 pups/litter

R. australiae- up to 19 pups/litter

probably low fecundity due to typical elasmo life history

characteristics

slide7

Prey

stomach contents: crab, bivalve molluscs

slide8

Conservation

habitat destruction

bycatch (prawn fishery, Indonesia and KwaZulu-Natal)

slide9

Conservation

targeted fisheries (fins, meat, Indonesia, Tanzania)

probably among most highly desired chondrichthyans

high value fins, highly palatable meat

slide10

Conservation

easily caught in bottom set gillnets, bottom trawls

slide11

Conservation

“protective” shark nets (KwaZulu-Natal)- but many released alive

life history characteristics

females caught more than males

slide12

Conservation

IUCN Redlist: all species vulnerable,

R. leubberti- endangered (W. Africa)

likely to see decreasing trends due to limited distribution,

continuation of unregulated fishing

slide13

Literature Cited

Compagno, L.J.V. & Marshall, A.D. 2006. Rhynchobatus luebberti. In: IUCN 2007. 2007 IUCN Red List of

Threatened Species. <www.iucnredlist.org>. Downloaded on 04 November 2007.

Compagno, L.J.V. & Marshall, A.D. 2006. Rhynchobatus sp. nov. A. In: IUCN 2007. 2007 IUCN Red List of

Threatened Species. <www.iucnredlist.org>. Downloaded on 04 November 2007.

Compagno, L.J.V. & Marshall, A.D. 2006. Rhynchobatus sp. nov. B. In: IUCN 2007. 2007 IUCN Red List of

Threatened Species. <www.iucnredlist.org>. Downloaded on 04 November 2007.

McAuley, R. & Compagno, L.J.V. 2003. Rhynchobatus laevis. In: IUCN 2007. 2007 IUCN Red List of

Threatened Species. <www.iucnredlist.org>. Downloaded on 04 November 2007.

McEachran, J.D. and N. Aschliman. 2004. Phylogeny of Batoidea. Pp. 79-114 in Biology of Sharks and

Their Relatives (J.C. Carrier, J.A. Musick, and M.R. Heithaus, eds). CRC Press, Boca Raton.

Stobutzki, I.C., M.J. Miller, D.S. Heales, and D.T. Brewer. 2002. Sustainability of elasmobranchs caught as

bycatch in a tropical prawn (shrimp) fishery. Fish. Bull. 100: 800-821.

White, W.T. and Dharmadi. 2007. Species and size compositions and reproductive biology of rays

(Chondrichthyes, Batoidea) caught in target and non-target fisheries in eastern Inodnesia.

J. Fish Biol. 70: 1809-1837

White, W.T. & McAuley, R. 2003. Rhynchobatus australiae. In: IUCN 2007. 2007 IUCN Red List of

Threatened Species. <www.iucnredlist.org>. Downloaded on 04 November 2007.

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