摘要
褐牙鲆（Paralichthys olivaceus）幼鱼取自山东省胶南市养殖场,盐度设置范围分别为12-40和5-47。实验表明,盐度12-40对平均初始体质量约2.6g的褐牙鲆幼鱼的湿重生长、湿重摄食率和湿重饲料转化效率均没有显著影响（P〉0.05）,但对蛋白质和能量表示的特定生长率、摄食率、饲料转化效率都有显著影响（实验周期为30d）。盐度5（IS5）和47（IS47）处理能够使初始体质量为6.93g的褐牙鲆幼鱼在10d内的生长显著比盐度19（IS19）处理慢（P〈0.05）,并且由于低盐度（盐度为5）引起的生长阻滞能够在30d内得到完全补偿,而高盐度（47）引起的生长阻滞未能得到补偿。在整个恢复期间（11-40d）,IS5处理的摄食率显著高于IS47处理（P〈0.05）,IS19处理处于中间水平。在盐度恢复至19后,不同处理在所有阶段的饲料转化效率和整个实验期间的平均饲料转化效率相互之间不存在显著差异。以上结果表明,低盐度（盐度为5）导致的生长阻滞的补偿主要依靠提高摄食率获得。结论认为,褐牙鲆幼鱼对盐度尤其对低盐度的适应能力较强。
Brown flounder, Paralichthys olivaceus is an important fishery and aquaculture species. The capacity of tolerating variable salinity is one of the important abilities to survival the different natural or cultural environments. Two experiments were conducted to investigate the effects of salinity manipulating on the growth of juvenile P. olivaceus. In the first experiment, juveniles with an average body weight of 2.6 g were kept in seawater with different salinities （12-S12, 19-S19, 26-S26, 33-S33,40-S40） for 30 d. In the second experiment, juveniles with body weight of 6.9 g were stocked in seawater with salinities 5 （IS5）, 19 （IS19） , and 47 （IS47） during the first 10 d. Then the salinities were adjusted to 19 in 3 d at a steady rate and the fish experienced a recovery period of 30 d. It was found that the wet weight growth, wet weight feeding rate, and wet weight feed conversion efficiency of juvenile P. olivaceus would not changed significantly within the salinity range between 12 and 40 （P〉0.05）. But salinity put significant effects on these parameters when they were calculated in terms of protein and energy （P〈0.05）. Juvenile P. olivaceus stocked in seawater with salinity 5 （IS5） and 47 （IS47） would grow significantly slower than that fish stocked in salinity of 19 （P〈0.05）. Fish in IS5 achieved completely compensatory growth in 30 d after the salinity was switched to 19. But fish in IS47 failed to catch up the weight offish in IS19. For the whole recovery period （I 1-40 d）, P. olivaceus in IS5 showed significant better appetite than that in IS47 and the appetite of fish in IS19 was in between. After switching of salinity from 5 and 47 to 19 respectively, no significant difference on feed conversion efficiency between treatments appeared during the experimental period （P〉0.05）. Results mentioned above indicated that the compensation of the growth delay caused by low salinity （5） was dependent mostly on improved feeding rate. It could be concluded that the juvenile was expecially tolerant to lower salinity stress.
出处
《中国水产科学》
CAS
CSCD
北大核心
2008年第4期615-621,共7页
Journal of Fishery Sciences of China
基金
国家自然科学基金项目(30600462)
国家支撑计划课题(2006037029019)
中国海洋大学本科生科学研究训练计划(SRTP)
关键词
褐牙鲆
盐度
摄食率
饲料转化效率
补偿生长
Paralichthys olivaceus
salinity
feeding rate
feed conversion efficiency
compensatory growth
