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Average number of live embryos spawned in a 30-min interval for the 10-week trial under the various conditions. Red and Green represent two AB wild-type populations of fish housed facing the EXIT sign. The control group represents a true 10-h dark cycle. Asterisks indicate a significant difference in reproductive performance (t-test, p < 0.05). Color images available online at www.liebertpub.com/zeb
