Fig. 3. Frequency histograms of
max values of individual LWS
cones from coho salmon (Oncorhynchus kisutch, Walbaum): (A) all
groups combined, (B) alevins, (C) TH-treated alevins, (D) parr and (E) ocean
smolts. Bin size=2 nm. The
max values were obtained by MSP
of individual LWS cones from the dorsal retina of coho salmon obtained from
Target Marine Products in April–May, 2005. Treatment with exogenous TH
resulted in a significant increase in the
max of LWS cones,
mostly as a result of a conversion from predominantly A1- to
A2-based chromophores.