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Oxygen Consumption, Operculum Movement Number and Ammonia Excretion of Cultured Tilapia (Oreochromis mossambicus) by Salinity Changes  

Lee, Chun-Hee (Provincial Office of Chungcheong Nam-Do)
Han, Sang-Woo (School of Marine Life Science, Kunsan National University)
Hur, Jun-Wook (School of Marine Life Science, Kunsan National University)
Lee, Jeong-Yeol (School of Marine Life Science, Kunsan National University)
Publication Information
Korean Journal of Environmental Biology / v.26, no.3, 2008 , pp. 138-144 More about this Journal
Abstract
The effects of salinity on oxygen consumption, operculum movement number and ammonia nitrogen excretion were examined in cultured tilapia, Oreochromis mossambicus (total length 10$\pm$1.0 cm, total weight 17.3$\pm$4.2 g). The fish were exposured to certain salinities (0, 3, 9, 15, 21, 27 and 32 psu) step by step with 3 psu$\cdot$d$^{-1}$ and changed rapidly from certain salinity to another salinity. The oxygen consumption of the fish which was transferred step by step showed increasing tendency in the range of 3 $\sim$ 27 psu, but markedly appeared very low value at 32 psu. The tolerance limit in tilapia by salinity change without acclimation was shown 23.3 psu from 96-h TL$_{50}$. The oxygen consumption, operculum movement and ammonia nitrogen excretion of fish which was transferred rapidly from certain salinity to each salinity (0, 9, 15, 21 and 32 psu) showed a changing point at 15 psu; they showed increasing and/or decreasing pattern before 15 psu, and showed decreasing pattern after 15 psu. From these results, it was concluded that the appropriate salinity without physiological change for Java tilapia was below 15 psu.
Keywords
Tilapia; Oreochromis mossambicus; salinity change; oxygen consumption; ammonia excretion; operculum movement;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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