Fish growth and health aspects of sea bass (Dicentrarchus labrax) reared in standard vs. high rate algal pond recirculation systems

Abstract

-Recirculation aquaculture system (RAS) is the type of land-based aquaculture production that interferes the least with the environment, particularly due to low effluent volume and overall water requirement. Water reuse, sometimes limited by the accumulation of waste products excreted by fish, can be improved by incorporating another biotechnical component in the form of high rate algal pond (RAS+HRAP), thus adding to the economy and self sustainability of the system. Our goal was to evaluate whether rearing fish for 1 year in a RAS or RAS+HRAP led to differences in fish production and health, by assessing: (1) fish growth; (2) impact on the morphological structure of sea bass target tissues (liver, kidney, and spleen); (3) susceptibility to monogenean parasites; (4) resistance to pathogen challenge with Listonella anguillarum; and (5) total blood protein. Over the one-year experimental period, sea bass showed no statistical differences in any parameter evaluated, suggesting that there was a satisfactory purification rate in the RAS+HRAP system.

Bioremediation of fishpond effluent and production of microalgae for an oyster farm in an innovative recirculating integrated multi-trophic aquaculture system

“…The salinity in the RAS ranged from 34.1 to 38.8 (37.8 ± 1.3) but was higher in the outdoor algal raceways and oyster tanks. PH in the RAS ranged from 6.3 to 7.7 (7.2 ± 0.2), in optimal range for seabass rearing (Mladineo et al, 2010). It was higher in the algal raceways, ranging, from 8.8 to 10.5 (9.9 ± 0.4), and in the oyster tanks, ranging from 8.2 to 9.6 (8.7 ± 0.3).…”

Growth Performance and Adaptability of European Sea Bass (Dicentrarchus labrax) Gut Microbiota to Alternative Diets Free of Fish Products

“…Fish were acclimatized with a commercial diet for one month, when all groups showed a feeding behavior consistent with the stocking density and development stage [39,41]. Three tanks were used for each experimental formulation (VEG-control, SPI, YEA, INS, and PAP), and one tank was used for the commercial condition COM.…”

“…Four thousand sea bass fingerlings were produced at Ifremer laboratory L−3AS (Palavas-les Flots, France). After a selection, 848 fish (19.32 ± 1.6 g) were tagged and randomly assigned to sixteen one cubic meter tanks (53 fish/tank) in a recirculating aquaculture system (RAS) ( Figure S1) [39]. Tank temperature was adjusted at 23.2 ± 0.7 • C all over the experiment.…”

Effect of dietary water content on European sea bass (Dicentrarchus labrax) growth and disease resistance

“…The fish body weight coefficient of variation was lower at the end of the experiment for all treatments and contributed to fish population homogeneity. However, the M 8 -SGR and -FCR were better under limited feeding conditions than in previous experiments in the same facility (Deviller et al 2004;Mladineo et al 2010). All these parameters indicate that our feeding strategy was correct.…”