Nunan C P, Noakes D L
Exp Biol. 1985;44(4):221-8.
Critical light levels necessary to produce avoidance movements in photonegative free embryos (eleutheroembryos) of the lake and brook charr and their F1 hybrid splake, (S. namaycush X S. fontinalis) were determined and compared to previously studied movement patterns within artificial substrate systems. Light sensitivity was inversely related to depth of penetration into artificial substrates. As well, brook charr held in vertical profile tanks under either 14 : 10 h light : dark cycles or total darkness showed similar movement patterns. These results do not support previous hypotheses concerning the role of ambient light in the initial downward movement of eleutheroembryonic salmonids within spawning redds.
确定了湖红点鲑、溪红点鲑及其F1杂交种银鲑（Namaycush湖红点鲑×溪红点鲑）的负趋光性游离胚胎（自由胚胎）产生回避运动所需的临界光照水平，并将其与先前在人工基质系统中研究的运动模式进行了比较。光敏感性与在人工基质中的穿透深度呈负相关。此外，饲养在垂直剖面水箱中的溪红点鲑，无论处于14:10小时光照:黑暗周期还是完全黑暗中，都表现出相似的运动模式。这些结果不支持先前关于环境光在产卵砾石内游离胚胎鲑科鱼类初始向下运动中所起作用的假设。
