Fig. 2

Effects of light spectrum and exposure time on the spectral sensitivity of juvenile Megalops atlanticus. Spectral sensitivity curves of M. atlanticus from ‘red’ and ‘blue’ light conditions were determined by electroretinography (ERG) and plotted at 2 month (a) and 4 month (b) time points. In a, b the average amount of light required to produce a criterion response of the retina was determined in 50 nm increments across the visible light spectrum. The average peak wavelength of sensitivity is shown for fish in each condition (c). The effects of light color and exposure time on peak spectral sensitivity of the retina was compared by a 2 × 2 multifactor ANOVA. Brackets with lettering indicate significant difference in sensitivity between spectral conditions. Error bars indicate standard error of the mean