Growth under laboratory conditions of wild juvenile black-spot sea bream (Pagellus bogaraveo B.)

As an alternative to the culture of traditional fish, experiments have been started with black-spot sea bream (Pagellus bogaraveo) and are summarized here. Two groups of bream (B-1 and B-2) with 63 fish of mean weight 173 g and 67fish of mean weight 217 g, respectively, were captured on the NW coast of Spain between September and December 1991, transported to the laboratory, and maintained in 12 m tanks. After about 30 days acclimation, lengths and weights of all fish were measured. These measurements were repeated at 2 month intervals,for 14 months in the first group and 10 months in the second. The mean weights reached at the end of these periods were 462 g and 383 s. respectively. Fish were fed with laboratory prepared moist food. and the amount eaten daily was controlled. Survival rate at the end of the experiment was 90.5% in group B-1 and95.5% in group B-2. Temperature, measured daily, ranged from 12ºC to 20°C. This paper provides information on the capture, transport, acclimation and maintenance of the fish throughout the experiment.Versión del editor0,000

Reproduction of blackspot seabream, pagellus bogaraveo B. in captivity

Publicad

Ongrowing of juvenile blackspot seabream Pagellus bogaraveo (Brünnich, 1768), in tanks and cages

We present results obtained from ongrowing blackspot seabream Pagellus bogaraveo (Brünnich, 1768), in cages and tanks. This experiment, conducted over the course of 12 months, used two batches of fish born in captivity, with individuals ranging from 30 to 200 g, whose average initial weight was 33.94±6.56 g, Daily growth rates were calculated, resulting in 0.36 % in tanks and 0.46 % in cages. Fish growth curves were drawn up for both culture systems, achieving the following equations: y = 33 e0,1733x (R²=0,9887) in cages and y=34,65 e0,13x (R²=0,9927) in tanks. The comparison of the slopes of these growth curves (t-test) showed that growth is considerably greater in cages than in tanks on land.Se muestran los resultados obtenidos en el engorde de besugo Pagellus bogaraveo (Brünnich, 1768) mantenidos en jaulas flotantes en el mar y en tanques emplazados en tierra y con el que se consiguieron incrementos de entre 30 y 200 g en el peso de los ejemplares. La experiencia, que tuvo una duración de 12 meses, se realizó con dos lotes de peces nacidos en cautividad y con un peso medio inicial de 33,94±6,56 g. Se calcularon las tasas de crecimiento diario, que fueron del 0,36 % en los tanques y del 0,46 % en las jaulas, y se determinaron las curvas de crecimiento de los peces para los dos sistemas de cultivo, obteniéndose las ecuaciones y=33 e0,1733x (R²=0,9887) para las jaulas e y=34,65 e0,13x (R²=0,9927) para los tanques. La comparación de las pendientes de las curvas de crecimiento (test t) muestra que el crecimiento es significativamente mayor en las jaulas flotantes que en los tanques situados en tierra.Instituto Español de Oceanografí

Experience with ongrowing juvenile blackspot sea bream (Pagellus bogaraveo) born in captivity, in tanks at diferent temperatures

Publicado

Experimental Feeding and Growth of Turbot (Scophthalmus maximus L.) from 0.5 To 2.7 Kg in Galicia (NW Spain)

Two groups of turbot, Scophthalmus maximus L., of 0.5 and 1.2 kg initial mean weight were fed a semimoist diet containing fish, fish meal and vitamin-mineral complex. The trial was carried out in tanks of 16 cubic meters, for aperiod of a year. Resul ts on feed conversion index and growth in weight are give