Fig. 4. Spectral sensitivity curves calculated from the electroretinograms (ERGs) of weakfish, spotted seatrout, red drum, Atlantic croaker and spot for wavelengths of 300—800 nm. N=6 individuals per species except Atlantic croaker (N=5). Responses at each wavelength were normalized to the wavelength of maximal voltage response (V_max) for each individual. Open symbols are results of day experiments, filled symbols are results of night experiments. Error bars indicate ±1 s.e.m.