Abstract
Prawns are regarded as delicious food items and a source of income as it is the salient exportable fishery item of Bangladesh and a number of other countries. Climate change may inhibit the general physiological activity of prawns. This study explored the eco-climatic effects on reproduction, including size at first sexual maturity (Lm), spawning season, and fecundity of monsoon river prawn, Macrobrachium malcolmsonii (Milne-Edwards, 1844). The study was carried out in the Ganges (Padma) River basin, northwestern Bangladesh, from January to December 2014. Seven hundred fifty-seven specimens ranging from 0.80 to 18.27 g BW (body weight) with TLs (total length) of 4.20 to 11.52 cm were analyzed. The Lm was estimated as 6.2–6.6 cm. Total fecundity was higher than earlier studies and ranged from 2743 to 122,165 with a mean value of 6715 ± 2437. The spawning season was estimated from April to October with a peak in July. Significant correlation was found between rainfall and the presence of ovigerous females, i.e., spawning season. The number of ovigerous females increased in ≥ 100 mm average rainfall, and the maximum ovigerous female spawned at 250–320 mm rainfall. Spawning season of M. malcolmsonii may have shifted with shifting rainy season as a result of climate change. The findings of our investigation would be useful for sustainable management of the fishery of M. malcolmsonii and other prawn species in the Ganges River, Bangladesh, and adjoining countries with similar eco-climatic factors.
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Md. Ashekur Rahman, formal analysis, writing — original draft, and writing — review and editing. Md. Yeamin Hossain, conceptualization, funding acquisition, methodology, formal analysis, writing — review and editing, and resources. Mostafa A. R. Hossain, writing — review and editing. Zoarder Faruque Ahmed, methodology and supervision. Ahmed Jaman, investigation and data curation. Jun Ohtomi, methodology, validation, and writing — review and editing. All authors read and approved the final manuscript.
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Highlights
• Spawning of prawns is significantly correlated with rainfall.
• Spawning season may have been moved with shifting rainy season due to climate change.
• Fishing below sexual maturity may decline future production.
• Fishing should be banned in peak spawning season.
• The climate change-induced alterations in the prawn physiology should be taken into account in future policy framing for sustainable management.
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Rahman, M.A., Hossain, M., Hossain, M.A.R. et al. Are there any effects of eco-climatic factors on freshwater prawn reproduction: a study on monsoon river prawn, Macrobrachium malcolmsonii. Environ Sci Pollut Res 29, 83273–83290 (2022). https://doi.org/10.1007/s11356-022-21649-1
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DOI: https://doi.org/10.1007/s11356-022-21649-1