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In salmonid fishes there are indications that socially subordinate individuals avoid competition with larger, dominant fish by adjusting daily feeding and activity cycles. As in other vertebrates, the pineal organ and its hormone melatonin act as synchronizers of daily rhythms to the external...

Larson, E. T.; Winberg, S.; Mayer, I.; Lepage, O.; Summers, C. H.; Øverli, Ø.
Elsevier Science, San Diego, USA
General and Comparative Endocrinology, 2004, 136, 3, pp 322-327

Øverli, Ø.; Olsen, R. E.; Løvik, F.; Ringø, E.
Aquaculture Research, 1999, 30, 4, pp 259-264