World Library  
Flag as Inappropriate
Email this Article

Ranina ranina

Article Id: WHEBN0025687534
Reproduction Date:

Title: Ranina ranina  
Author: World Heritage Encyclopedia
Language: English
Subject: Crab, Curacha, Horsehair crab, Cryphiops caementarius, Oratosquilla oratoria
Collection: Animals Described in 1758, Commercial Crustaceans, Crabs, Edible Crustaceans, Indo-Pacific Crustaceans
Publisher: World Heritage Encyclopedia

Ranina ranina

Ranina ranina
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Infraorder: Brachyura
Family: Raninidae
Genus: Ranina
Lamarck, 1801
Species: R. ranina
Binomial name
Ranina ranina
(Linnaeus, 1758)
  • Cancer ranina Linnaeus, 1758
  • Ranina dentata Latreille, 1825
  • Ranina serrata Lamarck, 1801
  • Ranina cristata Desjardins, 1835
  • Albunea scabra Weber, 1795 (nomen nudum)

Ranina ranina, also known as the (red) frog crab or spanner crab,[1] is a species of edible crab,[2] found throughout tropical and subtropical habitats.[3] It is the only extant species in its genus.[4]


  • Description 1
  • Distribution and ecology 2
  • Fishery 3
  • References 4


It may grow up to 150 millimetres (5.9 in) long, and may weigh up to 900 grams (2.0 lb).[5] The carapace is wider at the front, reddish brown in color, with ten white spots.[3] Ranina ranina is mainly nocturnal, and remains buried in the sand during the day.[1] Ranina ranina is easily distinguished from other crab species in its habitat due to its red carapace and elongated mid section.[5]

Distribution and ecology

Spanner crabs inhabit coastal waters along the east coast of Australia, from Yeppoon in Queensland to Nowra on the south coast of New South Wales. There is also a population to the north of Perth in Western Australia.[5] Ranina ranina is abundant in the coastal waters of south-western Mindanao, Philippines. These crabs are also found in the eastern coast of Africa, across the Indian Ocean to Indonesia, Japan and Hawaii.[6]

Ranina ranina inhabits depths of 10–100 metres (33–328 ft) on sandy-smooth substrata in which they bury themselves from where they attack small bottom-dwelling fish.[7] When waiting for prey, Ranina ranina will cover itself with sand, but leave its eye and mouthparts sticking out to help detect its food.[1] Offshore areas within this range in a subtropical or tropical environment serves as a habitat for Ranina ranina, but they must have ample sand for Ranina ranina to flourish, as covering themselves in sand is instrumental in their method of catching prey.


The species is commercially exploited over much of its range, but the largest fishery is in Australia, where the annual commercial catch an estimated at 3,592 tonnes (7,919,000 lb).[8][3] In Queensland, only adults above 100 mm (3.9 in) carapace length may be landed.[9] In the Philippines in 2008, prices for Ranina ranina were around 200–300 pesos per kilogram.[3] Ranina ranina populations have been surveyed to avoid overfishing and are currently stable.[10]

Although Ranina ranina is a target of commercial fishing operations, little is known about the species' biology, population dynamics and ecology.[9] Attempts have been made to grow Ranina ranina in captivity, but have so far been met with little success.[1]


  1. ^ a b c d Phyu Phyu Than, Taizo Sakata, Kazuhisa Hamada & Keinosuke Imaizumi (1999). "Ranina ranina"Characteristics of dominant microflora in aquaculture tanks of juvenile red frog crab, ( 
  2. ^ S. L. Slattery, A. L. Ford & S. M. Nottingham (1992). "Cooking methods for spanner crabs Ranina ranina (L) and their effect on cadmium residues".  
  3. ^ a b c d Oliver D. Tito & Jonalyn P. Alanano (2008). , Linnaeus) in Maluso, Basilan Province, Philippines"Ranina ranina"Some aspects of fisheries and biology of spanner crab ( ( 
  4. ^ Peter K. L. Ng, Danièle Guinot & Peter J. F. Davie (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world" ( 
  5. ^ a b c "Ranina ranina"Spanner crab . Fishing and Aquaculture.  
  6. ^ Juliana C. Baylon & Oliver D. Tito (2012) “Natural diet and feeding habits of the red frog crab (Ranina ranina) from southwestern Mindanao, Philippines” Philip. Agric. Scientist Vol. 95 No. 4, 391–398.
  7. ^ Sydney Fish Market, “Species information: Spanner Crab” (2013)
  8. ^ Queensland Fisheries (2010) “Stock Status of Queensland's Fisheries Resources 2009-10” Queensland Australia: Queensland Department of Employment, Economic Development and Innovation. 65
  9. ^ a b J. M. Kirkwood, I. W. Brown, S. W. Gaddes & S. Hoyle (2005). "Juvenile length-at-age data reveal that spanner crabs (Ranina ranina) grow slowly".  
  10. ^ J. McGilvray, I. Brown, E. Jebreen & D. Smallwood (2006) Fisheries Long Term Monitoring Program Summary of spanner crab (Ranina ranina) survey results: 2000-2005. Department of Primary Industries and Fisheries, Queensland, QI06095, Brisbane, Australia.
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.