
Fig. 2. Representative images of rainbow trout photoreceptors taken under infrared illumination. (A) The arrow points to a blue-sensitive cone (also shown in B and C). (D) Ultraviolet-sensitive cone. (E) Rod photoreceptors. (F) Double cone. Additional images were used in the calculation of mean outer segment diameter, which was used to determine specific absorbance (see Table1). Scale bars, 10 µm.