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Fig. 25. Eight-day running average of the number of upstream migrants in 2+ male and female sockeye salmon in the raceway. Dark and white bars indicate light dark-periods. This graph shows that the majority of 2+ land-locked sockeye salmon exhibit upstream migratory behavior before, during, and after dusk between 16:00 and 22:00. There was no clear difference between sexes. Reprinted with permission from Fish. Sci., 78, Munakata et al., Involvement of sex steroids, luteinizing hormone and thyroid hormones in upstream and downstream migratory behaviors in land-locked sockeye salmon Oncorhynchus nerka, 81–90, Fig. 4, © 2012b, The Japanese Society of Fisheries Science.

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