Abstract
The red swamp crayfish, Procambarus clarkii (Girard, 1852) is one of the most commonly-farmed freshwater species in inland China, but the yield is very low. The aim of this study was to assess whether the gender has effect on growth performance of P. clarkii. Male and female juvenile crayfish were individually reared in net cages for 75 days (trial 1). In addition, juvenile crayfish and adult crayfish of different gender were group-reared for 60 days and 30 days respectively (trials 2 and 3). The weight growth rate (WGR, %), length growth rate (LGR, %) and survival rate (SR, %) were monitored. Results showed that the length-weight regressions differed significant between males and females juvenile crayfish (P females > males) was noted among monosex and mixed-sex groups. No significant difference was noted, in terms of LGR, between females and males (P>0.05). However, the LGR of each of these was significantly lower than that of the mixed-sex groups (P<0.01). Our results demonstrated the gender has some effect on growth performance of P. clarkii, especially on adult crayfish.
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