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Hi there brains trust. For years I have wondered why pictures of big mulloway often show a pink area of bruising on the flanks. In contrast, I have never seen this on underwater footage of NSW/Qld mulloway taken by divers and spearos. I am really curious to see if anyone knows more. I even began to collect images to see if the bruising was limited to one side, or the other, and if it occurred only on largest fish. Early indications are it is mainly surf-caught, bigger fish, and often down the side toward the vent. See examples below, and the one with a yellow circle. The only things I have shortlisted from a range of possibilities are (a) a parasitic infection of some sort on the skin under the scales, (b) sand rubbing the fish when it is being landed, (c) some sort of contact with the line during the typical way mulloway fight, and (c) "spawning behaviour" where males might nudge females. As a semi-retired fish biologist, this is one of those questions that buzzes around in my head begging for an answer!! I don't think it is anything sinister. Apologies if the photos below are yours! I just Googled them off various FaceBook forums and the net. Any ideas or observations?? Thanks