Abstract: The gonado-somatic index（GSI）and hepato-somatic index（HSI）were monthly measured in Asian swimming crab Charybdis japonica with two body colors，red one named Chijiahong and gray-green one named Huagai，collected from Heishijiao coast in Dalian from March 2009 to January 2010 to study the relationship between body color and reproduction.Then，a selective mating experiment was designed using two different color crabs and artificially stained red crab.Results showed that an increase in GSIwas observed in both different color crabs from May to June，especially in the red Chijiahong，with themaximal GSIof 6.64％in the red Chijiahong and 5.22％in the Huagaiin June，without significant differences in GSIat May and June between Chijiahong and Huagai（P＞0.05）.The relationship of GSIand HSIwas negative for both colormorphs in themonthly sampling，with significant level for Huagai（P＜0.05）.Male Chijiahong hadmore opportunities tomatewith both female Chijiahong（mating rate of80.6％）and Huagai（mating rate of66.7％），without significant difference inmating rate among female Huagaiwith artificially stained red male（40％）and normalmale Huagai（60％）（P＜0.05），indicating body color has not significant role in mate choice of Asian swimming crab.
2016, Vol. 31 
