| Summary: | <p>A detailed study on the length-weight relationship of<em> Penaeus monodon (Fabricius, 1798)</em> in Kakkaithevu coastal waters in the northern part of Sri Lanka was conducted from the commercial catches during November 2010 to September 2011. The overall weight of the <em>P. monodon</em> individuals varied between 6.4 g - 46.3 g and the lengths ranged from 96 mm to 189 mm. The regression coefficient “b” and constant “a” tests were performed to compare the b values of males and females from the hypothetical value of 3. The calculated length-weight relationships obtained for male, female and pooled were W=0.0054 L3.0748, W=0.0062 L3.016, W=0.0039 L3.2183, respectively. The “b” value of male (3.0748) and female (3.016) did not differ significantly from the hypothetical value of 3 (p>0.05). The values of both males and females were close to 3, which indicated an approximate isometric growth pattern in<em> P. monodon.</em> The values obtained for the mean weight by sex show that females were significantly (p P. monodon..</p><br /><p>Tropical Agricultural Research Vol. 25 (1): 133-140 (2013)</p>
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