Acta Agriculturae Zhejiangensis ›› 2020, Vol. 32 ›› Issue (12): 2154-2161.DOI: 10.3969/j.issn.1004-1524.2020.12.06

• Animal Science • Previous Articles     Next Articles

Analysis on phenotypic traits of red claw crayfish (Cherax quadricarinatus von Martens) in different growth stages

CHEN Honglin1(), QIN Gaochan2, LOU Bao1,*(), QIAN Haojie3, YAO Zhenhai4   

  1. 1. Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    2. School of Fishery, Zhejiang Ocean University, Zhoushan 316022, China
    3. Honghai Culture Co., Ltd., Haining 314400, China
    4. Haining Aquaculture Technology Service Station of Zhejiang Province, Haining 314400, China
  • Received:2020-06-16 Online:2020-12-25 Published:2020-12-25
  • Contact: LOU Bao

Abstract:

In order to study the phenotypic characteristics of red claw crayfish (Cherax quadricarinatus von Martens) in different growth stages, nine phenotypic traits including body weight (Y1), hepatopancreas weight (Y2), full-length (X1), cephalothorax length (X2), cephalothorax width (X3), total abdominal segment length (X4), first abdominal segment length (X5), first abdominal segment width (X6), propodite length (X7) in three growth stages of 3 months, 4.5 months and 6 months were measured and analyzed. The differences of the phenotypic traits in the three stages were compared, and the correlations of the phenotypic traits in different growth stages were analyzed. Multiple regression equations of phenotypic traits to body weight of male and female red claw crayfish populations in different growth stages were constructed to measure the relevance of phenotypic traits and body weight. The results showed that the proportion of cephalothorax or abdominal segments to full-length remained the same in juvenile and adult stage, while the width index increased significantly (P<0.05) at 6 months of age. With the growth of red claw crayfish, the correlations among the majority of the traits decreased, and the differences in phenotypic characteristics between male and female populations gradually increased. The regression equation in 3 months of age was Y1=-31.33+0.73X2+0.91X3. The regression equation in 4.5 months of age was Y1=-65.25+1.29X3+0.89X4+1.46X6 for female and Y1=-69.67+1.17X3+0.40X7+1.77X6+0.59X4 for male, respectively. The regression equation in 6 months of age was Y1=-79.77+1.01X1-1.89X6+1.15X7 for female and Y1=-98.02+0.72X1+1.22X7 for male, respectively. These results could provide theoretical basis for the selective breeding of red claw crayfish.

Key words: red claw crayfish, phenotypic characters, sexual dimorphism, correlation coefficient, regression analysis

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