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Giant freshwater prawn (Macrobrachium rosenbergii) seasonal breeding in Bolgoda Lake?

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Li Angler•885 rep

What salinity triggers and mangrove root shelters sustain the wild breeding migration of Jumbo freshwater prawns between Bolgoda Lake and the Panadura ocean estuary?

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6 Answers from travellers

✓Accepted Answer

The Giant Freshwater Prawn (Macrobrachium rosenbergii / Karawadu Issa) follows an amphidromous life cycle across the twin basins of Bolgoda Lake. Mature adults live upstream in freshwater weed beds and submerged fallen timber. During the onset of inter-monsoon rains, berried females migrate downstream toward the Panadura river mouth where salinity reaches 10 to 14 PSU. Brackish water is physiologically required for the eggs to hatch and larvae to complete their 11 zoeal stages. Post-larvae migrate back upstream into fresh water, utilizing the root matrices of Sonneratia caseolaris mangroves as nurseries to shelter from predatory barramundi and catfish.

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D
Dr Nalin Limno•1810 rep

Artisanal fishers catch them using traditional brush-parks (kattudel) placed along reed channels, checking them with cast nets before sunrise.

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L
Li Angler•885 rep

Illegal sand mining near the Panadura estuary mouth damages the shallow saline wedge, disrupting the critical migration run of breeding females.

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Dharmasena Fish•1710 rep

Industrial chemical effluents discharged from textile laundries into the upper basin have caused localized declines in delicate larval survivorship.

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D
Dr Malaka Ocean•1850 rep

Wild-caught Jumbo prawns from Bolgoda are celebrated in Southern seafood curries for their firm texture and rich head-fat (tom没e).

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C
Chef Ruwan•1620 rep

Night operations using illegal chemical lighting lures are actively monitored and seized by regional fisheries inspector boats.

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Wasantha Ranger•1670 rep

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