Optimization of in situ culture of Bryothamnion triquetrum (Gmelin) Howe, using different fastening systems
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Abstract
Eleven in situ culture trials with the agarophyte Bryothamnion triquetrum were carried out during one year, using two fastening methods: rope fixation and free floating pieces inside net bags. Feasibility of farming this species has been shown when it is cultivated during short periods of time in summer. Polypropylene nets used as mechanical support restrain quite efficiently losses of seedling biomass. B. triquetrum can thrive inside hanging bags, reaching yields of up to 20.5 g m–1 day–1, with a mean sowing density of near 200 g m–1. Network opening, distance between the bags and size of the specimens suspended inside them, were factors that greatly influenced the harvestable crop. When seedlings were tied directly to the rope, specimen size and the thallus section used also influenced the final yield. Culture lapses were a determining factor in the yield with both methods.
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