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Fig. 1. Number of movements per hour in chorionated (chorion intact) and
dechorionated (chorion removed) rainbow trout embryos over a period of 25 h.
Negative numbers indicate times before hatch, time 0 indicates the 5-h
interval in which hatching occurred (defined as when the embryo body was free
of the chorion), and positive numbers indicate times post-hatch. Values are
means ± s.e.m. (N=4). *Significantly different from
chorionated values (P<0.05).