Blue tail on Redfish?

[ike84]

Males tend to be more colorful. This is also true in choupic

[Duck Butter]

here is what we know blue tails on redfish could indicate:

1. a juvenile
2. in shallow water
3. actively feeding
4. male

Is the tail of a juvenile male redfish actively feeding in shallow water more blue than a redfish that fits only one or two of the situations? I am totally confused now, we really need someone that works for NASA to figure this one out, i think i know just the person