中文摘要：

为获取全人工繁殖中华鲟后代的光照偏好及其可能适应人工环境的遗传行为改变，通过黑白底质颜色选择、趋光性和最适光照选择实验，并采用个体与群体实验相结合的方式对5月龄、7月龄中华鲟子二代幼鱼光照偏好进行了研究。黑白底质实验结果表明，5月龄和7月龄幼鱼偏好白色底质。趋光性个体实验结果表明，5月龄对光亮区（200-250lx）的选择较为显著（P〈0．05），7月龄对过渡区（20-50lx）选择较为显著（P〈0．05）；群体实验结果表明，5月龄和7月龄幼鱼均对过渡区（20-50lx）的选择较为显著（P〈0．05），此现象可能与“信号一适应”假说和最适光照范围有关。最适光照实验结果表明，5月龄幼鱼对45-135lx照度区选择显著高于其他区域（P〈0．05）；7月龄幼鱼较多地选择23-202lx照度区，表明随着年龄增大，中华鲟子二代幼鱼对光照的可接受范围变大。研究表明，中华鲟子二代5月龄和7月龄幼鱼偏好白色底质，最适照度为20-200lx。实验结果可以为中华鲟子二代人工养殖和放流提供参考。

英文摘要：

After the success of completely controlled propagation in Chinese sturgeon （Acipenser sinensis）, it is necessary to find out the possible behavior variation between wild group and second generation. We combined individual test and population test in 3 different experiments：test of substrate color preference, illumination intensity preference and the optimum illumination. The results showed that both 5-month and 7- month juvenile F2 A. sinensis significantly chose white substrate （95 % Confidence interval of preference on white substrate does not contain 50% ）. 5-month juvenile F2 A. sinensis individuals significantly chose illuminated area （200 - 250lx） （ P 〈 0.05 ）, while 7-month ones significantly chose transition area （ 20 - 50 Ix ） （P 〈 0.05 ）. Both 5-month and 7-month juvenile F2 A. sinensis populations preferred transition area （20 - 50 Ix） （ P 〈 0. 05 ） in population test. The different choice of illumination intensity preference between individuals and population in 5-month F2 A. sinensis may be related to ＇ signal-adaptation hypothesis＇ and the optimum illumination range. 5-month juvenile F2 A. sinensis significantly chose illumination area of 45 - 135 lx（P 〈 0.05 ） ; 7-month juvenile F2 A. sinensis significantly chose illumination area of 23 - 202 lx（ P 〈 0.05 ）. It meant that with the increasing age ,F2 A. sinensis strengthened its adaptability to illumination. From all above, both 5-month and 7-month juvenile F2 A. sinensis preferred white substrate, and the optimum illumination range was 20 - 200 lx. Compared with the existing wild juveniles data, their phototaxis has already declined.