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Fig. 2. Graph illustrating the change in visual pigment absorption characteristics
during growth of aquarium-reared black bream. The mean 
max
(±S.D.) for individual fish for each photoreceptor class as a function
of age is presented. Note the displacement to longer wavelengths from day 100
in both cone classes and the low standard deviation for the rod records.
Squares, short wavelength-absorbing cones; horizontal bars, rods; diamonds,
long wavelength-absorbing cones.
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