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A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT
AbstractThe effect of water treatment and flow rate on young Atlantic cod juveniles was investigated in a 36-days experiment. Four different flow rates (10, 20, 40, and 70 times the effective tank volume per day) were set up in triplicate tanks within each of three rigs with recirculated, UV-radiated, and untreated water, respectively. Each of the 36 tanks was stocked with 200 weaned cod juveniles at a mean weight of 0.048g. Fish mortality was recorded daily in all tanks, and growth (wet weight) was determined at the end of the experiment. The microflora in the rearing water was investigated by means of PCR-DGGE and flow cytometry. Observed mortality was significantly higher at low flow rates while otherwise unexplained mortality (presumed to be due to cannibalism) was lowest in the recirculation system. No correlation was found between survival and growth. Growth was significantly affected by both water exchange rate and treatment, as the juveniles from high flow rates and the UV-treatment showed elevated growth rates. Both growth and survival scaled in accordance with metabolic Runar Thyrhaug passed away January 7, 2011. The authors wish to dedicate this paper to his memory. * Corresponding author. Tel.: +47 56182262; fax: +47 56182222. E-mail address: Terje.van.der.Meeren@imr.no Deceased
A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 factors like oxygen saturation and unionized ammonia. Bacterial concentrations increased in all tanks and treatment from the beginning of the experiment to the end. The UV-treated and untreated water started at typical seawater concentrations (0.5-1 x10 6 mL -1 ) and increased five t...