Abstract
To assess the effect of anaesthetic on stress response in cultured sweetfish (Plecoglossus altivelis) during transportation, the levels of plasma cortisol, glucose, lactic acid, , osmolality and survival were determined. The transportation was performed in square boxes where liquefied oxygen was saturated in polyethylene bags. Fish transportation was carried by car for 2 hours after anaesthesis with lidocaine-HCl/1,000 ppm in experiment. Mean plasma cortisol concentration before transportation was 170.7ng/ml. After transportation, the levels of plasma cortisol increased to 518.5ng/ml (Control), 461.9ng/ml (Sham control), 369.4ng/ml (20ppm anaesthetic), 304.0ng/ml (40 ppm anaesthetic), 405.7ng/ml (80 ppm anaesthetic) and 499.1ng/ml (160ppm anaesthetic) in each experimental groups, respectively (p and osmolality in 40ppm anaesthetic group did not show significant differences in this before and after transportation (P>0.05). These result reveal an anaesthetic lidocaine HCl/1,000ppm is effective as sedative for transportation mixture in this species. This research provides baseline data on cortisol, glucose, lactic acid, , osmolality and survival for anaesthetic transportation.
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