Does the water reuse affect the fish growth, welfare quality? A review
2012
Lang, S., Mendelova Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Mares, J., Mendelova Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Kopp, R., Mendelova Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi
The fish production in aquaculture is growing from year to year. However capacities of current aquaculture facilities are limited. So the need of intensification of old facilities and building new intensive facilities is obvious. The high intensity of fish culture generates some questions. Could water reuse affect fish growth, welfare, health or quality of final product? A lot of research was performed for this issue but just a few works compared water reuse systems (RAS) versus flow through systems (FTS). A problem with CO2 oversaturation was solved by shallow diffusers. Fin erosion seems to be a problem of high stocking density and system hygienic but it is not related directly to water reuse. A few papers were written about biochemical blood stress markers. Changes in blood composition were found at extreme stocking densities (over 124 kg/cubic m for rainbow trout and 70 kg/cubic m for sea bass). The fish are able to accustom to increased noise produced by RAS equipment very fast so it don't affect fish negatively. All results indicates that if the ecological characteristics are kept in natural range for the fish reared in RAS, there is no negative effect of water reuse on fish.
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