Optimization of in situ culture of Bryothamnion triquetrum (Gmelin) Howe, using different fastening systems

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.

Population Dynamics of Colonizing Fauna and Its Effect on Growth Rates of the Farmed Red Alga <i>Alsidium triquetrum </i> (S. G. Gmelin) Trevisan

“…In Figure 8, the variation in biomass is compared with the use of three methods described for the species by [22], (see Figures 1(a)-(c)).…”

“…Once cleaned, all fragments were placed individually inside mesh bags (33 × 33 cm with 6 cm mesh openings). In order to arrive at the adequate opening diameter of 6 cm, the intervals (3, 6 and 9 cm were previously checked) according to previous methods [22]. Furthermore, it was verified that the plants grew better with the 6 cm opening of light, because those with 3 cm impeded the passage of light and the 9 cm ones were affected by juvenile fish (Figure 1(a), see detail).…”

El género Kappaphycus Doty (Rhodophyta, Gigartinales): Un estudio de caso en la plataforma Insular Cubana I

“…Fueron colectadas muestras de ejemplares de talos de las tres cepas de Kappaphycus alvarezii parda, parda-verde y verde y una de la cepa de K. striatus (Figura 1), que se encontraban en cultivo experimental en Playa Viriato al NW de La Habana (23°05'36" N y 82°28'32" W). La colecta se realizó manualmente mediante buceo en apnea a una profundidad de 1 m desde el nivel de marea en el sistema de cuerdas del área de cultivo según el método referido en Areces & Soberats (1992). Los ejemplares, colectados mensualmente, se lavaron con agua de mar en el sitio de colecta, eliminándose el exceso de arena y organismos epifitos.…”

Relationship of Trace Elements Concentration and Growth Rate in <i>Alsidium triquetrum</i> (Rhodophyta)

“…One example is the limited information regarding micro elements interactions between farmed macroalgae. Alsidium is known to be a source of intermediate quality agar [15], of biogenic compounds [16], shows a wide physiological tolerance to salinity [17], and supported several fastening systems [18], making it an effective candidate for aquaculture [19].…”