Malaysian giant prawn, Macrobrachium rosenbergii (de Man, 1879), is an important crustacean aquaculture candidate globally cultured chiefly in hot climates and seasonally in temperate zones. Although the first hatchery for artificial production of the species was established in Malaysia in 1984, however, its genetic improvement program has just started recently. This study was executed as a part of this improvement project to evaluate morphometric growth related traits of four populations collected from the Western Coast of Peninsular Malaysia and their progenies. The results of the study disclosed significant differences among these populations for all traits that were considered; with Kedah population showing significant (p