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E-FAS, vol. 18, no. 4, pp.373-378, December, 2015
DOI. http://dx.doi.org/10.5657/FAS.2015.0373

Postprandial Ammonia Excretion and Oxygen Consumption Rates in Olive Flounder Paralichthys olivaceus Fed Two
Different Feed Types According to Water Temperature
Paralichthys olivaceus, Ammonia excretion, Oxygen consumption, Moist pellet, Expanded pellet, Metabolite

Jinhwan Lee

Aquaculture Research Division, National Institute of Fisheries Science, Busan 46083, Korea

Postprandial ammonia excretion and oxygen consumption in olive flounder Paralichthys olivaceus fed two different feed types,
moist pellet (MP) and expanded pellet (EP) diets, to satiation were determined at 12°C, 15°C, 20°C, and 25°C for 48 h. The ammonia
excretion and oxygen consumption rates increased with increasing water temperature. However, the postprandial times for
the maximum rates of ammonia excretion and oxygen consumption were shortened from 12 h to 6 h after feeding with increasing
water temperature. The ammonia excretion and oxygen consumption rates of fish fed EP were significantly higher (P < 0.05)
than those fed MP at 12 h post-feeding both for 12°C and 15°C. The highest (P < 0.05) weight-specific ammonia excretion rates
at 12°C were observed in fish fed EP and MP at 12.1 mg NH3-N kg-1h-1 and 8.7 mg NH3-N kg-1h-1, respectively, for 12 h and 9 h
after feeding. The highest (P < 0.05) weight-specific oxygen consumption rates at 12°C were observed in fish fed EP and MP at
116.4 mg kg-1h-1 and 101.0 mg kg-1h-1, respectively, for 12 h after feeding. The highest ammonia excretion rates at 25°C in fish fed
EP and MP increased to 16.9 mg NH3-N kg-1h-1 and 18.3 mg NH3-N kg-1h-1, respectively, for 6 h after feeding. The highest (P <
0.05) weight-specific oxygen consumption rates at 25°C were observed in fish fed EP and MP at 184.3 mg O2 kg-1h-1 and 197.3
mg O2 kg-1h-1, respectively. These data are extremely valuable for the design of biofilters and development of effluent treatment
technologies for land-based flounder farms.



Keyword : Paralichthys olivaceus, Ammonia excretion, Oxygen consumption, Moist pellet, Expanded pellet, Metabolite

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