Stock Assessment of a Non-Commercial Fish Sciaena coitor (Hamilton, 1822) from Middle Stretch of River Ganga

Based on the length frequency data growth, mortality, and population parameters of Sciaena coitor from the scoop net (mesh size 0.5–2 cm) catches from middle stretch of Ganga at Allahabad were estimated. The length-weight relationship for pooled data was log W = 76.39315 L2.48487. The asymptotic length (L∞) and growth coefficient (K) were estimated to be 198 mm, and 0.868 year−1, respectively. The total, fishing and natural mortality coefficients were estimated as 3.31, 1.55 and 1.76 respectively while the ‘E’ 0.468 year−1. The recruitment was continuous with one peak per year. The Lc50 was obtained at 115 mm. Yield isopleth diagram generated, give optimum yield at E of 0.4 and Lc/L∞ = 0.58.