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Tenualosa ilisha is a popular anadromous and significant trans-boundary fish. For sustainable management and conservation of this fish, drawing an appropriate picture reflecting population status of this species is very essential based on their all-strategic habitats in Bangladesh. In this study, 139 samples from 18 sites were collected and cross-species gene enrichment method was applied to discover the exact population status of the fish. Like most of the Clupeiforms, nucleotide diversity and variation of this shad were very low. Population differences between most of the locations were low and not significant. However, P values of a few locations were significant (P< 0.05) but their pairwise FST values were very poor, which is inadequate to recognize any local populations. Structure analysis, PCA and maximum likelihood IQtree all indicated the presence of a single population in the Bangladesh water with some admixture individuals, which may contain partial genes from other populations. In the ML IQtree and Network, most of the individuals were mixed without showing any precise grouping, which might due to their highly migratory nature. Fishes from special type of habitats, e.g., haors, small coastal rivers etc. were not unique and no genetic differences between migratory cohorts were found. |
