Atya scabra (Leach, 1816)

Atya scabra View in CoL

In total, 16 individuals were sampled: 8 (50 %) males and 8 (50 %) females. Carapace length of males ranging from 29.23 to 43.75 mm, with an average of 38.34 ± 10.61 mm, while that of females ranged from 8.37 to 30.09 mm, with an average of 22.06 ± 10.04 mm. The overall average was 29.19 ± 10.27 mm.

Male weight ranged from 11 to 39 g (mean = 26 ± 10.27 g), while female weight ranged from 1 to 11 g (average = 6.62 ± 3.92 g); the overall average was 16.31 ± 12.5 g. The relationships between carapace length and weight of males and females were described by the potential equations y = 0.0123CL 2.0247 and y = 0.005CL 2.29748, respectively, where y is the weight and CL is the carapace length in mm ( Fig. 5 View Figure 5 ).

The total length of males ranged from 78.62 to 112.64 mm, with an average of 100.40 ± 24.26 mm. Female length ranged from 31.13 to 81.12 mm, with an average of 64.95 ± 23.15 mm. The overall average was 80.46 ± 23.44 mm. The CL × TL, CL × CW, and CL × DacL relationships showed no statistically significant differences between sexes ( Tab. 3). The equations that describe each of these relationships, as well as each R², are shown in Figure 6 View Figure 6 . Both sexes presented negative allometry for the CL × TL and CL × CW relationships and isometry for CL × ProL, CL × AL and CL × DacL. In other relationships, there were different growth patterns between males and females. Males presented positive allometry for CL × MerL and CL × CarL, while females presented negative allometry for the former and isometry for the second relationship. Females presented isometry for CL × PL, while males presented negative allometry for this relationship. Males presented negative allometry for the CL × AmL and CL × AmW relationships, and constant ratio Am L/W ( Tab. 4, Fig. 6 View Figure 6 ).