Fig. 2.

Body and eye color cycling of nuptial males. Mean color scores show that few treated males expressed nuptial coloration, and those that did lacked the color intensity shown by control fish. The 100 mg/L males failed to develop any nuptial coloration. Body scoring criteria were as follows: 0 = no nuptial coloration; 1 = light-orange coloration in/around the mouth or throat (ventrally); 2 = orange remains on mouth and is present on the operculum, but not posterior to it; 3 = light-orange coloration along body posterior to the operculum (easily seen). Light or patchy bluish-gray coloration on back. Eye scoring criteria were as follows: 0 = no color; 1 = light blue on dorsal side only; 2 = light blue on dorsal and ventral sides only; 3 = dark blue on dorsal and ventral sides, with light blue on anterior and posterior; 4 = eyes completely the same shade of blue; 5 = iridescent or glowing appearance to entire eye. Eye still completely blue.