Morphological discrimination of tiger shrimp Penaeus monodon between female and male based on traditional and truss morphometric analyses

The morphological difference of tiger shrimp, Penaeus monodon from Aceh waters is limited to explore for female and male discrimination using morphometric analyses. The study aimed to evaluate the morphological characters between female and male tiger shrimp using traditional and truss measurements. A total of 57 samples (39 females and 18 males) were analysed using 9 characters for traditional morphometric and 40 characters for truss morphometric. Multivariate analyses were applied to reveal the morphometric variation between male and female populations. The result of principal component analysis indicated that 4 characters, i.e: carapace length (CL), carapace width (CW), rostrum length (RL), and sixth segment length (SL6), were significantly different (P<0.05), while three truss morphological characters, i.e: distance between anterior and posterior carapace, distance between ventral posterior sixth segment to telson end, and distance between anterior and posterior second segment, were significantly discriminated (P<0.05) between female and male of tiger shrimp. Overall, 94.9% of the male and 88.9% of the female individuals were assigned to their native populations using traditional morphometric analysis, while truss morphometric was 87.2% and 88.9%, respectively. The individual proportion of 93.0% was properly classified into their original population group for traditional morphometric and 87.7% for truss morphometric characters.