Royal Gramma dimorphism
Here are pictures of male Royal Gramma and Female royal Gramma. If we only look at the body, and not look at the tail, the purple to yellow ration of the male is 2:1 and of the female is 1:1.
Looking at the length of the pelvic/ventral fins. The male pelvic fins extended way pass the begin of the anal fin while the female pelvic fins barely reach the begin of the anal fin. The pictures below clearly show these characteristics
Here are pictures of male Royal Gramma and Female royal Gramma. If we only look at the body, and not look at the tail, the purple to yellow ration of the male is 2:1 and of the female is 1:1.
Looking at the length of the pelvic/ventral fins. The male pelvic fins extended way pass the begin of the anal fin while the female pelvic fins barely reach the begin of the anal fin. The pictures below clearly show these characteristics