To study the effect of light intensity on red claw crayfish juveniles, experiments were carried out in this study. The results showed the following. (1) The 20 lux group had the highest survival rate. (2) The growth rates of the 20 lux, 200 lux and 0 lux groups were faster. (3) The juveniles in the 1000 lux and natural light groups were always clustered, while other groups were dispersed within 2–3 days. The 0 lux and 20 lux groups had higher dispersion. (4) Antioxidant capacities in the 0 lux and 20 lux groups were higher, and immune capacity in the 20 lux group was higher. (5) Monoamine contents were lower in the 0 lux and 20 lux groups. (6) α-AMY or EcR expression in the 20 lux or 0 lux group was higher. We concluded that (1) juveniles under 20 lux light intensity had higher survival and growth rates. (2) The dispersion of juveniles at 0 lux and 20 lux light intensity was higher. (3) The physiological metabolism and immune abilities of juveniles at 0 lux and 20 lux light intensity were higher. (4) 0 lux and 20 lux was helpful in inhibiting cannibalism. (5) A 20 lux light intensity was helpful to in the expression of α-AMY to improve digestion and absorption capacity. Low-intensity light enhanced the expression of EcR, which contributed to the moulting of juveniles. We considered in actual production, it could be necessary to control 20 lux light intensity during the intermediate cultivation period of juveniles.

中文翻译：

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光照强度对红爪螯虾 Cherax quadricarinatus 幼体影响的研究

为研究光照强度对红螯小龙虾幼体的影响，本研究进行了实验。结果显示如下。(1) 20勒克斯组存活率最高。(2)20勒克斯、200勒克斯和0勒克斯组的增长速度较快。(3) 1000勒克斯和自然光组幼鱼始终聚集，其他组在2-3天后分散。0 勒克斯和 20 勒克斯组具有更高的色散。(4)0勒克斯和20勒克斯组的抗氧化能力较高，20勒克斯组的免疫能力较高。(5)0勒克斯组和20勒克斯组单胺含量较低。(6) α-AMY或EcR20勒克斯或0勒克斯组的表达更高。我们的结论是 (1) 20 勒克斯光照强度下的幼鱼具有更高的存活率和生长率。(2)0勒克斯和20勒克斯光强下幼鱼的分散度较高。(3)0勒克斯和20勒克斯光强下幼鱼的生理代谢和免疫能力较高。(4) 0 lux和20 lux有助于抑制自相残杀。(5)20勒克斯的光照强度有助于α-AMY的表达，提高消化吸收能力。低强度光增强了EcR的表达，这有助于幼鱼的换羽。我们考虑到在实际生产中，幼鱼中期养殖期间可能需要控制20勒克斯的光照强度。