Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Physiological Responses during Freshwater Acclimation of Seawater-Cultured Black Porgy (Acanthopagrus schlegeli)

감성돔, Acanthopagrus schlegeli의 담수순화 과정에서 나타나는 생리학적 반응

Min, Byung Hwa;Kim, Bum Kwang;Hur, Jun Wook;Bang, In Chul;Byun, Sun Kyu;Choi, Cheol Young;Chang, Young Jin
민병화;김범광;허준욱;방인철;변순규;최철영;장영진

  • Published : 20030000
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Abstract

Physiological responses (cortisol, glucose, Na±, Cl-, osmolality, aspartate aminotransferase (AST), alanine aminotransferase (ALT), hematological factors, and survival rate) were investigated during freshwater acclimation of seawater-cultured black porgy (Acanthopagrus schlegeli). As control, in seawater, there were no significant differences in the investigated items during the experimental period. In step-salinity change, plasma cortisol level was significantly increased from 13.0±1.4 ng/mL at the beginning to 29.5±14.8 ng/mL at 5 days, and recovered to the basal level (19.7±1.6 ng/mL) at 10 days. Glucose showed a tendency to co-increase with cortisol. Plasma Na± and Cl- concentrations decreased from 176.7±3.8 and 152.7±1.5 mEq/L to 111.8±38.0 and 73.5±26.5 mEq/L, respectively, at 5 days. But these recovered as completely as the basal levels at the end of the experiment (20 days). Also, changes of osmolality levels showed a similar tendency with Na± and Cl- levels. Although AST was markedly elevated at 12 hours, its level soon recovered to the basal level. No significant differences in Hct, RBC and Hb were found during the experimental period. Survival rate was 86.7% at 5 days and 83.3% at 20 days. The results presented in this paper suggest that it may be possible to culture black porgy in freshwater.

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References

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