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Fig. 1. Mean
max ±2 s.e.m. for rods, middle
wavelength-sensitive (MWS) cones and long wavelength-sensitive (LWS) cones
from alevin (A), parr (P), ocean smolt (O) and TH-treated alevin (TH) coho
(Oncorhynchus kisutch, Walbaum). The mean values for each group were
calculated from the means of all individual fish in each group
(N-values below the error bars). The means for each fish were based
on the
max values obtained for that receptor class (see
text for details).