Sexual dimorphism in the silverbelly Leiognathus brrvirostris (Val.) is reported. Females grow larger and heavier than males. In the former, both caudal fin lobes are tinged pale yellow. But in males, the lower lobe is more yellowish. Similarly, in females only the anterior % portion of the anal fin is coloured yellow. But in males the anterior region as well as the entire margin of the anal fin is coloured bright orange yellow. Females overcome males in all morphometric measurements also.