Abstract: Juvenile pearl gentian grouper(Epinephelus fuscoguttatus♀×E.lanceolatus ♂) with body weight of(26.05±1.23)g were reared in a 1 m~3 glass fiber reinforced plastics trough at a salinity of 6, 12, 18, 24, and 30 at water temperature of(28±1)℃ for 30 days to investigate the effect of salinity on growth, and gill and kidney histological structures of pearl gentian grouper. The results showed that the best growth rate including specific growth rate(SGR) was observed in the juveniles at a salinity of 6(59.89 g±1.12 g) and 12(58.15 g±1.13 g), significantly better than that at other salinities(P<0.05). There was significantly lower SGR in the juveniles in salinity 18 group than that in the other salinity groups at the end(P<0.05), while the food intake and food conversion ratio(FCR) were significantly higher than those in other salinity groups(P<0.05). Histologically, the secondary filament width was decreased gradually, and the distance between adjacent secondary filaments was increased in pearl gentian grouper juveniles exposed to increasing salinity, with the maximal secondary filament width in the juveniles in salinity 6 and 12 groups, significantly higher than that in the other salinity groups(P<0.05) with the minimal adjacent secondary filament distance in salinity 6, 12 and 18 groups, significantly smaller than that in the other salinity groups(P<0.05). The pearl gentian grouper juveniles had more and larger chloride secretory cells in diameter as the increase in ambient salinity, the minimal chloride secretory cell diameter in salinity 6 group, and significantly less than that in the salinity 18, 24, and 30 groups(P<0.05). There were shorter glomerular long diameter and less glomerula as the increase in ambient salinity, the largest glomerular length-diameter in salinity 6 group and significantly larger than that in the other salinity groups(P<0.05), without significant differences in glomerular length-diameter between salinity 18, 24, and 30 groups and significantly lower than that in salinity 6 and 12
刘龙龙, 罗鸣, 陈傅晓, 刘金叶, 谭围, 王永波, 符书源. 盐度对珍珠龙胆石斑鱼幼鱼生长及鳃肾组织学结构的影响[J]. 大连海洋大学学报, 2019, 34(4): 505-510.
LIU Long-long, LUO Ming, CHEN Fu-xiao, LIU Jin-ye, TAN Wei, WANG Yong-bo, FU Shu-yuan. Effects of salinity on growth,and gill and kidney histological structures of juvenile pearl gentian grouper. Journal of Dalian Ocean University, 2019, 34(4): 505-510.
2019, Vol. 34 
