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Ceylon sea moss (Gracilaria edulis) coastal farming: rope-spore seeding in Puttalam Lagoon?

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Sarah Phycology•910 rep

How do artisanal coastal cooperatives cultivate red agarophyte seaweed on suspended monofilament rope lines across shallow brackish lagoon waters in Kalpitiya?

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5 Answers from travellers

✓Accepted Answer

Cultivating Ceylon Sea Moss (Gracilaria edulis) provides a sustainable alternative livelihood for fishing communities in Puttalam Lagoon. Farmers anchor submerged longline frameworks using bamboo stakes driven into shallow sandy mud (1 to 1.5 meters depth). Healthy vegetative vegetative fragments (apical cuttings of 5-10cm) are inserted into the twists of 6mm polypropylene ropes at 15cm intervals. Suspended 30cm below the water surface, the seaweed captures sunlight while receiving continuous tidal nutrient flushing, doubling its biomass every 14 days before harvest.

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D
Dr Nilmini Phycology•1880 rep

The ropes must be manually shaken and brushed twice weekly to remove epiphytic green algae and fine silt that shade photosynthetic red pigments.

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Sarah Phycology•910 rep

Harvested Gracilaria is washed thoroughly in fresh water and sun-dried on clean nylon netting for three days, bleaching to a pale ivory color containing 15% moisture.

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Ian Flavors•880 rep

Boiling the dried seaweed in water extracts high-grade industrial agar-agar, used domestically for setting jelly desserts and in scientific microbiology culture media.

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Mia Grains•930 rep

Seaweed farms create structured artificial nursery habitat that attracts schools of juvenile rabbitfish (Siganus) and lagoon glass shrimp.

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Ranger Bandara DWC•1770 rep

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