Abstract: Green mussel, Perna viridis samples which inhabit in the subtidal bed of Ye Estuary were monthly collected from March 2016 to February 2017 to estimate the population parameters using length-frequency data based analysis of FiSAT II software. Asymptotic length (L∞), growth coefficient (K) and growth performance index (Φ) were calculated as 162.75 mm, 0.87 year−1 and 4.363 respectively. Total mortality (Z), natural mortality (M) and fishing mortality (F) were estimated at 1.86 year−1, 0.81 year−1 and 1.05year−1. The calculated exploitation level (E) of the population was 0.44 and it (< 0.50) suggests that the stock of P. viridis shows the potential for exploitation in Ye Estuary. More exploitation is possible and could be an option for the livelihood of the coastal communities of the area. The recruitment pattern was continuous with one major peak in the months of June-July. The present results could serve as a baseline information for the management of mussel population in Ye Estuary.