Journal
AQUACULTURE INTERNATIONAL
Volume 11, Issue 3, Pages 277-288Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1024839903568
Keywords
ammonia excretion; Eurasian perch (Perca fluviatilis); oxygen consumption; recirculation system
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The impact of feeding, fish size (body weight from 18.5 to 56.5 g) and water temperature (20 and 23 degreesC) on oxygen consumption (OC, mg O-2 kg(-1) h(-1)) and ammonia excretion (AE, mg TAN kg(-1) h(-1)) was studied in Eurasian perch held in recirculation systems. OC for both fed and feed-deprived (3 days) fish was higher at 23 degreesC (278.5 and 150.1 mg O-2 kg(-1) h(-1)) than at 20 degreesC (249.3 and 135.0 mg O-2 kg(-1) h(-1); P < 0.01). AEs for both fed and feed-deprived fish were also significantly higher at 23 &DEG;C than at 20 &DEG;C (P < 0.001). Water temperature and fish size had a significant impact on the oxygen: feed ratio (OFR, kg O-2 kg(-1) feed fed day(-1)) and ammonia: feed ratio (AFR, kg TAN kg(-1) feed fed day(-1); P < 0.001). Their average values at temperatures of 20 and 23 &DEG;C were 0.17 and 0.19 kg O-2 kg(-1) feed fed day(-1) and 0.009 and 0.011 kg TAN kg(-1) feed fed day(-1), respectively.
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