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handle: 10261/315551 , 10508/7667
Se probaron los efectos de la densidad de cultivo (11 y 50 individuos m-2, respectivamente) y refugio (presencia o no de macroalgas en las bandejas) en la supervivencia de juveniles de centollo (M. brachydactyla) de dos meses de edad. Todos los grupos se alimentaron con mejillón (Mytilus sp.) cocido y congelado, añadido ad libitum durante todo el experimento. Al cabo de 60 días, en el experimento I, la supervivencia en las cubetas de baja densidad fue del 83,3±19,3%, significativamente más alta (P0,05) (33,3±19,2% y 37,0±20,2%, con algas y sin algas, respectivamente). Al término de los 60 días de experimentación, la densidad de los centollos en todas las cubetas fue similar a la empleada en la menor densidad del primer experimento (11 centollos m-2, equivalentes a 3 centollos por cubeta). Esta densidad parece ser apropiada para el cultivo de juveniles de centollo, en las condiciones de cultivo empleadas (T=20±2ºC, fotoperiodo natural correspondiente a los meses entre septiembre y marzo en una latitud de 37º 13’N y salinidad cercana a 35 ups). Las tasas de crecimiento en peso (g) y longitud del caparazón (mm), utilizando el mejillón cocido y congelado como alimento, fueron de 2,1±0,7% día y de 0,6±0,3% día, respectivamente.
The effects of culture density (11 and 50 spider crabs m-2, respectively) and shelter (presence or not of macro algae in the trays) on survival of 2 months old juvenile spider crabs (M. brachydactyla) were tested. All groups were fed boiled and frozen mussels (Mytilus sp.) ad libitum, during the entire experiment. After 60 days, in the experiment I, survival of spider crabs cultured at the lower density was 83.3±19.3%, significantly higher (P 0.05) (33.3±19.2% and 37.0±20.2%, respectively). The final density of spider crabs in all trays, after 60 days of experimentation, was similar to the lower density tested (11 spider crabs m-2, equivalent to 3 spider crabs m-2). This density seems to be appropriate for the culture of juvenile spider crab, in the defined culture conditions (T=20±2ºC, natural photoperiod corresponding to the months between September and March in a latitude of 37º 13’N, and salinity close to 35 ups). Growth rates in weight (g) and carapace length (mm), when feeding on boiled and frozen mussels were of 2.1±0.7% BW d-1, and of 0.6±0.3% BW d-1 respectively.
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Acuicultura, Centro Oceanográfico de Vigo
Acuicultura, Centro Oceanográfico de Vigo
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