To our knowledge, this study is the first to investigate growth
retardation in a freshwater species, Nile tilapia, cultured in RAS. The
objective of this study was to test whether growth retardation really
occurs in Nile tilapia cultured in RAS (and notwhat the causative factors
were). Therefore we decided to compare RAS with a maximal chance of
detecting growth retardation. Because growth inhibiting factors (GIF)
may originate from the fish, biofilter and/or the feed, itwas our intention
to operate RAS in which all possible sourceswere present. Therefore, the
growth of Tilapia was compared between RAS different in stocking
density, age of the biofilter, feed load andwater exchange rate. The water
quality, growth performance, feeding behaviour and stress response
were compared between these systems in an attempt to understand the
consequences for Tilapia of using nearly closed RAS as applied in practice
To our knowledge, this study is the first to investigate growthretardation in a freshwater species, Nile tilapia, cultured in RAS. Theobjective of this study was to test whether growth retardation reallyoccurs in Nile tilapia cultured in RAS (and notwhat the causative factorswere). Therefore we decided to compare RAS with a maximal chance ofdetecting growth retardation. Because growth inhibiting factors (GIF)may originate from the fish, biofilter and/or the feed, itwas our intentionto operate RAS in which all possible sourceswere present. Therefore, thegrowth of Tilapia was compared between RAS different in stockingdensity, age of the biofilter, feed load andwater exchange rate. The waterquality, growth performance, feeding behaviour and stress responsewere compared between these systems in an attempt to understand theconsequences for Tilapia of using nearly closed RAS as applied in practice
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