15 SEPTEMBER 1999
RESISTANCE TO VIBRIO ALGINOLYTICUS IN JUVENILE ROCKFISH (SEBASTES SCHLEGELI) FED DIETS CONTAINING DIFFERENT DOSES OF ALOE
K.H. Kim, Y.J. Hwang, S.C. Bai-1999
Aquaculture, 180(1-2): 13-21
Abstract
The effects of aloe-supplemented feeds on nonspecific immune responses and disease resistance were determined in juvenile rockfish (Sebastes schlegeli). Experimental fish, which were naturally infected with Vibrio alginolyticus during acclimation period, were fed to satiation once daily in triplicate groups with a commercial diet supplemented with 1 or 5 g aloe/kg diet or without aloe for 6 weeks. Dietary aloe had no significant influence on the serum lysozyme activity. The chemiluminescent (CL) responses of head kidney leucocytes from fish given control and 1 g aloe/kg diet were significantly higher (p<0.05) than that of fish given 5 g aloe/kg diet. At the end of the feeding trial, cumulative mortality of fish from 5 g aloe/kg diet group was significantly lower (p<0.05) than did the fish given control and 1 g aloe/kg diet. All dead fish were positive for V. alginolyticus and showed the same gross signs. The results of the present study showed that feeding aloe in moderate doses can help to control V. alginolyticus in juvenile rockfish.
(Department of Aquatic Life Medicine, Pukyong National University, Pusan 608-737, South Korea)