There are places I fish where I catch bass that are more silver/green in color than the normal green/black coloration. Other places the bass have a golden color with not much black patterns. This shows that bass can have varied coloration which depends on many factors such as genetics, environment, etc.

I fish a series of park ponds that are treated with chemicals to prevent algae blooms and the water ends up being a inch of visibility, my bass also look like a sliverish color. I think it has something to do with water clarity. 

I noticed in some aquariums the bass  look washed out coloring. Was told it was that they didn’t have the right lights, no UV, and effects the coloring of the fish . Shallow Bass get more sun and are different coloring than the bass that stay deep. 
Don’t know if that’s true or not, just what I was told in passing. 

22 hours ago, Captain Phil said:

Bass often change hue depending upon the water they come out of.  Here on the Harris Chain, you can tell if a fish has been caught in the open lake, in a canal or in the pads.  Open lake fish are pale and much lighter than those caught inshore.  Back water bass are much darker.  Okeechobee bass are dark green with very distinctive black eye pigment.  The bass that come out of tannin stained lakes like Blue Cypress are almost totally black.  The most beautiful bass are in the Ocala National Forest lakes.  They have white bellies, green backs and their markings are highly detailed.

THIS ^^^^^
I would just add that Ive noticed most fish you put in a live well go in with subdued markings, but when you pull them out after awhile they will be brilliantly colored in most cases.

I caught a completely “silver” bass once while cast netting shiners out of a murky  golf course pond. 

 

1 hour ago, N Florida Mike said:

I would just add that Ive noticed most fish you put in a live well go in with subdued markings, but when you pull them out after awhile they will be brilliantly colored in most cases.

 

Some salt water fish change color when their activity level changes.  For example, bill fish "light up" and turn an iridescence blue when attacking a bait.   Dolphin (Mahi Mahi) change color radically from bright green chartreuse to silver.  These color changes are so striking they can be seen from the cockpit.  

Bass come in a variety of shades and colors.  A lot depends on the environment they live in, and every once in a while, comes the freaks of nature.  About a year ago I caught a black Peacock Bass.  You could just see the faint bars and slight dot on the tail.  Except for the color it was all peacock bass, including bad ass attitude.  Just like humans every once in a while there are freaks of nature.