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Adult dominant males are extremely easy to sex - They have Black Anal and Ventral Fins and a Black Dorsal Fin with a bright yellow top stripe, as they age they also develop more Black pigment leading to a jet black underside and Charcoal Stripes on its body, from the front they look as though they are wearing a Mask . Sub dominant males are harder to sex in that whilst they will usually also have black Anal/Ventral fins the black pigment is far less pronounced leading to easy confusion between sub dominant Males and Females.
Female Yellow Labs are a paler/pastel version of the Males - They tend not to have any black Anal/Ventral fins these instead being a pale yellow, The Females tend to be much smaller than the Males although this difference is not obvious as Juveniles when all the Fish are the same size.
