The hybrids I have caught and know of will usually have the distinctive black streak running from nose to dorsal fin, sometimes to the tail. The only way to determine (black or white) on that one for sure would have been to count the dorsal fin spines. I will start to pickup a lot of pale fish in the late spring and especially summer, usually means pale fish been in deeper water and darker fish a good bit shallower, more exposure to sunlight. And heck, I've even had them go from dark to pale in a few seconds out of the water