"Gelidium sesquipedale" (clem) thuret cultivation in Galicia (Spain)
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[1] Universitat de Barcelona
Universitat de Barcelona
Barcelona, España
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- Localización: Lagascalia, ISSN 0210-7708, Vol. 19, Nº 1-2, 1997, págs. 179-186
- Idioma: español
- Enlaces
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Resumen
An experiment on cultivation of Gelidium sesquipedale (Clem.) Thuret, by vegetative propagation, has been carried out in the coast of Galicia, Suitable substratum was obtained from different geological deposits, cracked into gravel and cemented to the surface of cylinders (1 m, long and 30 cm. diameter). The cylinders were made of a mesh of rigid plastic embedded in concrete, and containing expanded plastic material inside to give them a required buoyancy. The plant was inseminated placing fragments of thallus on the surface of the cylinders and binding them by a ribbon of nylon gauze. The cylinders were set up at 3-4 m. depth in four different places in the sea and fixed to a dolphin of concrete situated at 10-12 m. depth. This original system of farming, which we can call "reversed long line" is very simple, flexible and opposes little resistance to hydrodynamical forces. The cylinders responded perfectly to the physical demands of the experiment. The material suitable for algal fixation gave the positive results expected. The dolphin system of fixing the cylinders to the bottom individually was satisfactory. The location of the experiment was more problematic. All the cylinders placed in the "Rias" and bays, where mussel cultivation is abundant, soon showed poor condition; a layer of muddy material appeared on the algae and opportunistic and nitrophylous species, together with mussel larvae, were installed on them. Only in the experiment placed open to the ocean, and therefore more exposed to the surf and far from the "Rias", were the results positive. The muddy material was smaller and the plants grew without epiphytes (only some small specimens of Polysiphonia sp.Larninaria sp. and Saccorhiza sp. were detected)
