Table 2 The measurements of reproductive attributes and related indices of Eriocheir sinensis
Reproductive attributes | Reproductive indices | Measurements |
|---|---|---|
The abundance of females and males | Female | The number of female crabs caught by gillnet per net per day (ind/(net·d)) |
Male | The number of male crabs caught by gillnet per net per day (ind/(net·d)) | |
Male/female | The ratio of male to female | |
The general status of females | Carapace width (CW) | The width of the crab carapace measured across the widest point (mm) |
Carapace length (CL) | The length of the crab carapace from the base to the eye orbit (mm) | |
Body weight (BW) | The wet weight of crab (g) | |
The status of the females’ hepatopancreas | Hepatopancreas weight (HW) | The wet weight of females’ hepatopancreas (g) |
Hepatosomatic index (HSI) | HSI (%) = HW/BW × 100% | |
The status of the mated females’ gonads | Gonadosomatic weight (GW) | The wet weight of mated females’ ovaries (g) |
Gonadosomatic index (GSI) | GSI (%) = GW/BW × 100% | |
The status of ovigerous females’ fertilized egg mass | Absolute fecundity (AF) | The wet weight of fertilized egg masses (g) |
Relative fecundity (RF) | RF (%) = AF/BW × 100% |