Effects of prolonged reduction of dissolved O2 concentrations on growth of turbot (Psetta maxima) juveniles
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AuthorsRodrigues-dos-Santos-Domingues, P.M. (Pedro Miguel); Hernández-Urcera, J. (Jorge); Cal, R. (Rosa)
The knowledge of oxygen availability and consumption is one of the prerequisites for the development of aquatic systems (Brown et al., (1984), since low levels of available oxygen impose limitations on aquatic poikilotherms (Fernandez and Rantin, 1989). The effect of a prolonged (21 days) decrease in dissolved oxygen was compared on growth of juvenile turbot (Petssa maxima). Turbot (Psetta maxima) is a flatfish that has been cultured for many years in commercial aquaculture. Since this species is usually cultured at high densities, up to 40 Kg m-2 (Martinez-Tapia and Fernandez Pato, 1991), the effects of lower dissolved oxygen concentrations are an important factor for the optimization of commercial scale aquaculture. Initial weight of turbot was of 10,6±1,3 g; at the end of the 21 days experiment, juvenile turbot exposed to a lower dissolved oxygen concentration grew less (15,9±0,5 g) compared to those cultured at normal concentrations (17,8±0,6 g) (p<0.05).
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