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Production, use and fate of Chilean brown seaweeds: re-sources for a sustainable fishery

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Abstract

Chile is an important producer of brown seaweeds representing 10% of world supply. Landings of Chilean kelp fluctuated between 40,000 t.year−1 in the early ‘80s to 250,000 t.year−1 more recently. Commercialized algae come from natural populations and no mass-cultures of involved species have been established. Four species of brown algae are commercially collected in the country: Lessonia trabeculata, L. nigrescens, Macrocystis pyrifera and M. integrifolia. Since 2000, the demand of alginate sources and food for cultivated abalones dramatically raised the harvesting of these species. Direct evaluations of Lessonia spp. and Macrocystis standing-stocks were made along 700 km of coast in northern Chile. Lessonia spp. estimated populations exceed 900,000 t, whereas M. integrifolia does not exceed 300 t. The insights provided indicate that sustainability of Chilean kelp subjected to intense harvesting would require management programs including the following bio-ecological recommendations: (1) to harvest the entire plant including the holdfast; (2) to harvest plants larger than 20 cm in diameter; (3) to harvest plants sparsely, selecting mayor specimens; (4) rotation of harvesting areas; and (5) for Macrocystis, to cut the canopy 1–2 m from the surface. They must be implemented in a National Program of Kelp Management, elaborated by government, scientists, fisherman, and industry.

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Acknowledgements

O. Castillo, R. Rojas, G. Vásquez, G. Aguirre, N. Kusmicic, E. Montanares, J. Johnson for their valuable work in the field. COPRAM Marine Seaweed Producers-Chile and Abalone Association-Chile.

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  1. Departamento de Biología Marina, Universidad Católica del Norte, Center for Advanced Studies in Arid Zones (CEAZA), Casilla 117, Coquimbo, Chile

    Julio A. Vásquez

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Correspondence to Julio A. Vásquez.

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Vásquez, J.A. Production, use and fate of Chilean brown seaweeds: re-sources for a sustainable fishery. J Appl Phycol 20, 457–467 (2008). https://doi.org/10.1007/s10811-007-9308-y

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