Since I do not know what time of the year the video you are watching was taken, the information I am about to give could be all wrong. I do know that in the spring of the year when the water temperatures start to rise, the smallmouth will move onto the shallow points to prepare to spawn and they will be a light to pale color due to them being in deeper water for the winter and when they move into the shallow water and have stayed they will darken up to blend in with their surroundings. This goes for most species. When you catch one that is darker you know that they have been there for awhile and one that is pale and light colored has just moved in from low light deep water.
This could be worthless info.......
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.