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Effect of Fish Number in Respiratory Chamber on Routine Oxygen Consumption of Black Porgy Acanthopagrus schlegeli Reared in Seawater or Freshwater  

Jeong, Min-Hwan (Department of Aquaculture, Pukyong National University)
Kim, Young-Soo (Department of Aquaculture, Pukyong National University)
Min, Byung-Hwa (Department of Aquaculture, Pukyong National University)
Chang, Young-Jin (Department of Aquaculture, Pukyong National University)
Publication Information
Journal of Aquaculture / v.20, no.2, 2007 , pp. 121-126 More about this Journal
Abstract
Comparison of fish number on routine oxygen consumption (OC) of black porgy (Acanthopagrus schlegeli) reared in seawater (SW) versus freshwater (FW) was performed in closed water-recirculating system containing respiratory chamber. Fish acclimated in separate indoor tanks with SW or FW were sampled as two groups (one or three of fish used, $mean\;{\pm}\;S.D.=36.4{\pm}9.8$). OC of fish reared in both SW and FW showed clear temporal rhythms, with higher values in the daytime and lower values at night, in accordance with light (09:00-21:00 h) and dark (21:00-09:00 h) phases of the diel cycle (12L:12D). The OC of the fish increased linearly with the water temperature. The OCs of black porgy reared in SW and FW at 15, 20, $25^{\circ}C$ were 140.0, 174.8, 282.3 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ and 177.5, 307.8, 413.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ for the one of fish used, and 200.5, 274.7, 339.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ and 118.2, 188.2, 252.8 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ for three of fish used, respectively. Black porgy reared in SW had higher ventilation rates than those in FW. These results indicate that black porgy reared in FW had higher OC than those in SW at the one of fish used, but the fish reared in SW had higher OC than those in FW at the three of fish used.
Keywords
Acanthopagrus schlegeli; Oxygen consumption; Fish number; Water temperature; Salinity;
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