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Portunus trituberculatus:   (click for more)

Portunus trituberculatus:   (click for more)

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Synonyms
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  • Portunus pelagicus  Rathbun, 1902
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  • Neptunus trituberculatus  Miers, 1876, (original description).
  •  
  • Portunus trituberculatus  Rathbun, 1902
    FAO Names
    En - Gazami crab, Fr - Crabe gazami, Sp - Jaiba gazami.
    3Alpha Code: GAZ     Taxonomic Code: 2311100404
    Diagnostic Features
    Carapace rough to granulose with regions discernible.  Front with 3 acutely triangular teeth with the central projected slightly forwards of the lateral ones; 9 teeeth on each anterolateral margin, the most external one much larger than the preceding.  Chelipeds elongate: larger chelae with conical tooth at the base of fingers; 4 spines on the inner margin of the merus. Legs laterally flattened to variyng degrees, last 2 segments of last pair paddle-like.  Carapace colour dull green to brown. 
    Geographical Distribution

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    Indic and West Pacific Oceans: Southeast and East Asia (from Japan, Korea, China and Formosa and the Bay of Bengala), to the West, North and East of Australia.
    Habitat and Biology
    Habiting sandy and sand-muddydepths in shallow waters to 50 m depth.
    Size
    Maximum carapace width 15 cm (males). A male of 149 mm cw has a carapace lenght of 70 mm.
    Interest to Fisheries
    Caugth mainly by trawling. It is an important commercial species in Japan, where it is a common edible crab, and it is collected in large numbers in some areas. The total catch reported for this species to FAO for 1999 was 284 851 t. The countries with the largest catches were China (270 280 t) and Korea, Republic of (11 819 t).
    Local Names
    English : Horse crab .
    Japanese : Gazami ,  Watarigani .
    Remarks
    The species is similar to Portunus pelagicus in its general appearance. P. trituberculatus is, however, easily distinguished from P. pelagicus because it have 3 frontal teeth (4 in P. pelagicus ) and it have 4 spines in the merus of chelipeds (3 in P. pelagicus ). Portunus sanguinolentus (Herbst, 1783) inhabit the same area but it is easily distingushed by their 3 prominent maroon to red spots on posterior 1/3 of carapace.
    Bibliography
    Carpenter, K.E. and V.H. Niem (eds.). 1998Species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. vol. 2: cephalopods, crustaceans, holothuroideans and sharks. Rome. F.A.O.
    Sakai, T.1976 Crabs of Japan and the adjacent seas. Kodansha Ltd. Tokyo. 773 p.
     
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