Abstract
Abstract 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. Spawning season was estimated based on the monthly variations of percent ovigerous females. Recruitment and growth were estimated using the time series of the length-frequency distributions. We compared the von Bertalanffy growth function (VBGF) and the Pauly and Gaschutz growth function (PGGF) to identify any seasonal oscillation in growth rate. Ovigerous females occurred almost throughout the year, indicating a prolonged spawning season with two peaks between March-April (minor peak) and June-September (major peak). Both males and females with modal size ~ 8.0 mm carapace length first recruited in October, which synchronized with the major peak spawning season. There was seasonality in growth rate; hence, PGGF was adopted as the best-fitting model to describe the growth of both sexes. The estimated equations were Lt = 17.86 (1- exp [-2.432 (t/12 - 0.072) - (1.766/2π) sin {2π (t/12 - 0.982)}] for males and Lt = 23.18 (1- exp [-1.342 (t/12 + 0.106) - (0.388/2π) sin {2π (t/12 - 0.209)}] for females. Sexual dimorphism was found with larger size in females than males. Longevity was estimated to be ~ 14 months for both sexes. These findings can be useful to formulate management measures for this prawn.
Highlights
Macrobrachium Spence Bate, 1868 is one of the most diverse genera of the family Palaemonidae comprising more than 250 species (Molina et al, 2020) and found in almost all types of freshwater and estuarine habitats in tropical and subtropical regions (Holthuis, 1980)
Rainfall, and photoperiod were correlated with the spawning season of M. lamarrei (Fig. 1), which indicated a significant relationship with temperature and rainfall, but no relationship was found with photoperiod
This study provides information on some life history traits of M. lamarrei; spawning season, recruitment, and growth, for example
Summary
Macrobrachium Spence Bate, 1868 is one of the most diverse genera of the family Palaemonidae comprising more than 250 species (Molina et al, 2020) and found in almost all types of freshwater and estuarine habitats in tropical and subtropical regions (Holthuis, 1980). Freshwater prawns were abundant in the rivers, beels (relatively large surface, static waterbody that accumulates surface run-off water through an internal drainage channel), canals, streams, and ponds of this country (Ahamed et al, 2014). Their production has been declining due to both natural and man-made catastrophes, degradation of aquatic environments, and reduction of wetlands and water areas (Graaf et al, 2001). It is essential to take proper management measures for their conservation and sustainability
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