Spawning season, recruitment, and growth of the freshwater prawn Macrobrachium lamarrei (H. Milne-Edwards, 1837) in a perennial wetland, northeastern Bangladesh

Spawning season, recruitment, and growth of the freshwater prawn Macrobrachium lamarrei were studied in a perennial wetland, northeastern Bangladesh during October 2016 to September 2017. season was estimated based on monthly variations percent ovigerous females. Recruitment using time series length-frequency distributions. We compared von Bertalanffy function (VBGF) Pauly Gaschütz (PGGF) identify any seasonal oscillation rate. Ovigerous females occurred almost throughout year, indicating prolonged spawning with two peaks between March-April (minor peak) June-September (major peak). Both males modal size ~ 8.0 mm carapace length first recruited October, which synchronized major peak season. There seasonality rate; hence, PGGF adopted as best-fitting model describe both sexes. The equations Lt = 17.86 (1- exp [-2.432 (t/12 - 0.072) (1.766/2π) sin {2π 0.982)}] for 23.18 [-1.342 + 0.106) (0.388/2π) 0.209)}] Sexual dimorphism found larger than males. Longevity be 14 months These findings can useful formulate management measures this prawn.