A Characteristics of Biological Resources of Portunus trituberculatus (Miers, 1876) around the Chilsan Inland Younggwang, Korea

Abstract

: Frequency distribution of carapace width, relative growth, sex ratio and fecundity of blue crab Portunus trituberculatus in Younggwang adjacent water were investigated. A total number of individuals collected for this study were 658(Males: 305 and females: 353). Water temperature and salinity of the study areas varied from 5. 9 to 27. 3℃ and 28. 1 to 31. 6psu, respectively. The carapace length-width and carapace width-weight relationship was calculated and the equations obtained are; For males; CL=1. 3652CW+ 22. 495(R 2 =0. 741), TW=0. 0068CW 2. 4001 (R 2 =0. 749), For females; CL=1. 3073CW+25. 684(R 2 =0. 791), TW=0. 0061CW 2. 4231 (R 2 =0. 801). The sex ratios(Males: females) for blue crab were 0. 86: 1. The value of correlations coefficient between total weight and fecundity of the blue crabs was higher that of between carapace width and fecundity.