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Individually tagged Atlantic cod (Gadus morhua L.) (mean body weight 459+/-6 g) were reared in 20-m 3 tanks supplied with running sea water. During the first year the fish were exposed to one of four photoperiod regimes: Natural light (LDN), continuous light from June 23, 1993 (LL), natural light from June 23, 1993 and continuous light from December 22, 1993 (LDN/LL) or continuous light from...
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