Length-Weight Relationship of the Three-Spot Swimming Crab (Portunus sanguinolentus Herbst, 1783) in Trang Province, Thailand

  • Apirak Songrak
  • Supit Nuchoo Rajamangala University of Technology Srivijaya
Keywords: Length-weight relationship, Three-spot swimming crab, Trang Province


The length-weight relationship of Three-spot swimming crab (Portunus sanguinolentus Herbst, 1783) in the coastal area of Trang, southern Thailand was estimated from 1,553 crabs (male=956, female=597) collected by two fishing gear types, i.e. crab gill net and crab trap. The sampling was conducted between January to December 2016. The range of the inner carapace width (ICW), the outer carapace width (OCW) and the carapace length (CL) were 5.21-10.76, 6.34-13.34 and 2.82-6.56 cm, respectively. The range of body weight (BW) was 18-130 g The length-weight relationships between inner carapace width, outer carapace width and carapace length with body weight of the crabs were BW=0.208*ICW2.710, BW=0.134*OCW2.627 and BW=2.121*CL2.248, respectively. The values of the exponent “b” in the length–weight relationship (W=aLb) of males and females varied between 2.242 to 2.742. The slope of the linear equation, the number indicating growth pattern, were significantly different from “b=3” (p < 0.05) for all measured length of crabs. It can be concluded the growth patterns of Three-spot swimming crab was allometric.


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