I was always told that the orange color and the dark red blood vessels mean they are actively spawning or preparing to spawn. I was thinking that many were spawning in the deeper water to get the optimal water temp for the eggs.
I was always of the opinion that when nature let the fish know it was time to spawn the just found the right water temp and did their thing, regardless of the depth(within a certain range).
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Deck Officer/2nd Engineer - M/V Saint Charles.
2004 Tracker 17.5' Panfish
Tite-lok rod holders - PST and BGJP rods
I fish, therefore I am!