The migratory tropical shad, Tenualosa ilisha has a wide range of habitat preferences like rivers, reservoirs, estuaries, backwaters, and coastal waters during different phases of its life cycle. The present study investigates morphological variations among three populations of Hilsa from distinct ecosystems such as the River Brahmaputra, Narmada estuary and Ukai reservoir. Thirteen morphometric and nine meristic measurements were considered for the present study. Among the meristic traits, significant variation was observed in counts of lateral line scales and post ventral scutes. The MANOVA results depict a significant difference in the morphometric traits among the three populations. The factor analysis indicated a very significant loading of head-related traits on the first factor and traits related to the middle and caudal region on the second factor. The study portrayed a significant morphological variation among the different stocks of T. ilisha and the results were confirmed in discriminant function analysis.

中文翻译：

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从三个不同的热带生态系统中地理隔离的热带sha鱼Tenualosa ilisha（Hamilton，1822）的地理上孤立的迁徙和非迁徙种群的形态变化

迁徙的热带sha鱼，Tenualosa ilisha在生命周期的不同阶段，它们具有多种栖息地偏好，例如河流，水库，河口，死水和沿海水域。本研究调查了雅鲁藏布江，纳尔默达河口和Ukai水库等不同生态系统的三个希尔萨种群的形态变异。本研究考虑了13个形态测量和9个综合测量。在有利性状中，观察到侧线鳞片和腹侧后盾的数量显着变化。MANOVA结果描述了三个种群之间形态特征的显着差异。因子分析表明，第一个因子的头部相关性状和第二个因子的中尾部相关性状的负荷非常显着。T. ilisha及其结果在判别函数分析中得到证实。