I figured out why sometimes the orange/red on the opercular tab does not show up very well in my pictures. While holding the fish what I observed is that as the fish breathes and moves its gill cover, as it expands the opercular tab pushes away from the fish body, the orange tab slumps, and no longer being against the fish body does not show up well in the picture.
Many times I have caught a RES, it is obviously a RES, I take the picture, then at some later time I look at the picture on a larger computer screen and it shows up hardly at all or faintly.
Both of these fish had a very distinct, solid, orange border on the end of the opercular tab. The first picture shows up "ok" but the second fish hardly at all. But it was there. Not a translucent tab like on a GSF, but solid like RES.
