Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution, Shanghai Ocean University, Shanghai, 201306, China.
Department of Zoology, Jagannath University, Dhaka, 1100, Bangladesh.
Sci Rep. 2021 Jun 2;11(1):11560. doi: 10.1038/s41598-021-90864-6.
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. Like most of the Clupeiforms, nucleotide diversity of this shad was very low (0.001245-0.006612). Population differences between most of the locations were low and not significant (P > 0.05). However, P values of a few locations were significant (P < 0.05) but their pairwise F values were very poor (0.0042-0.0993), which is inadequate to recognize any local populations. Our study revealed that the presence of a single population in the Bangladesh waters with some admixtured individuals, which may contain partial genes from other populations. Most of the individuals were admixed without showing any precise grouping in the ML IQtree and Network, which might due to their highly migratory nature. Fishes from haors and small coastal rivers were not unique and no genetic differences between migratory cohorts. The hilsa shad fishery should be managed considering it as a single panmictic population in Bangladesh with low genetic diversity.
伊氏圆腹鲱是一种受欢迎的洄游性和重要的跨界鱼类。为了实现对这种鱼类的可持续管理和保护，根据它们在孟加拉国的所有战略栖息地，描绘一幅反映该物种种群状况的恰当图片是非常必要的。在这项研究中，从 18 个地点采集了 139 个样本，并应用了跨物种基因富集方法。与大多数鲱形目鱼类一样，这种鲱鱼的核苷酸多样性非常低（0.001245-0.006612）。大多数地点之间的种群差异较低且不显著（P>0.05）。然而，少数几个地点的 P 值是显著的（P<0.05），但它们的成对 F 值非常低（0.0042-0.0993），不足以识别任何地方种群。我们的研究表明，在孟加拉国水域存在一个单一的种群，其中有一些混合个体，这些个体可能包含来自其他种群的部分基因。大多数个体混合在一起，没有显示出在 ML IQtree 和网络中任何精确的分组，这可能是由于它们高度洄游的性质。哈罗和小沿海河流中的鱼类并不独特，迁徙群体之间没有遗传差异。应该考虑将伊氏圆腹鲱渔业作为孟加拉国的单一混合种群进行管理，因为其遗传多样性较低。
