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Effects of Water Temperature and Salinity on the Oxygen Consumption Rate of Juvenile Spotted Sea Bass, Lateolabrax maculatus  

Oh, Sung-Yong (Marine Resources Research Department, Korea Ocean Research & Development Institute)
Shin, Chang Hoon (Agribrands Purina Korea Inc.)
Jo, Jae-Yoon (Department of Aquaculture, Pukyong National University)
Noh, Choong Hwan (Marine Resources Research Department, Korea Ocean Research & Development Institute)
Myoung, Jung-Goo (Marine Resources Research Department, Korea Ocean Research & Development Institute)
Kim, Jong-Man (Marine Resources Research Department, Korea Ocean Research & Development Institute)
Publication Information
Korean Journal of Ichthyology / v.18, no.3, 2006 , pp. 202-208 More about this Journal
Abstract
An experiment was conducted to investigate the effects of three water temperatures (15, 20 and $25^{\circ}C$) in combination with three salinities (0, 15 and 30 psu) on the oxygen consumption rate of juvenile spotted sea bass, Lateolabrax maculatus (mean body weight $5.5{\pm}0.3g$). The oxygen consumption rates of L. maculatus were measured in triplicate for 24 hours using a continuous flow-through respirometer. Water temperature resulted in significant differences in the mean oxygen consumption rate of L. maculatus (p<0.001), but salinity and combinations of salinity and water temperature did not have (p>0.05). The oxygen consumption increased with increasing water temperatures in all experimental salinity regimes (p<001). Mean oxygen consumption rates at 15, 20 and $25^{\circ}C$ ranged 328.8~342.3, 433.9~441.0 and 651.5~659.9 mg $O_2\;kg^{-1}\;h^{-1}$, respectively. $Q_{10}$ values did not vary with salinity, bud varied with water temperature. $Q_{10}$ values ranged 1.63~1.75 between 15 and $20^{\circ}C$, 2.24~2.26 between 20 and $25^{\circ}C$, and 1.92~1.98 over the full temperature range. The energy loss by metabolic cost increased with increasing water temperatures in all experimental salinity regimes (p<0.001) Mean energy loss rates at 15, 20 and $25^{\circ}C$ ranged 224.6~233.8, 296.3~301.2 and $444.9{\sim}450.7kJ\;kg^{-1}\;d^{-1}$, respectively. These data suggest that the culture of juvenile spotted sea bass is possible without energy loss by salinity difference in freshwater as well as seawater after salinity acclimation. Thus, this result has an application for culture management and bioenergetic model for growth of this species.
Keywords
Lateolabrax maculatus; oxygen consumption rate; water temperature; salinity;
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