About
Adult Yellowstriped Leatherjacket is black-brown to green-brown with a yellow blotch on the caudal peduncle. This blotch often extends forward along the side of the body as a yellow stripe in fish from Victoria, South Australia and Western Australia. Fish from New South Wales rarely have a stripe.There are four spines on the caudal peduncle. In males these are curved and preceded by a patch of bristles. The spines are smaller in females and juveniles.
The yellow markings vary a lot in this species with some only have a slight yellow shade to some having the yellow in the tail. The body colour also is varible. The ID images should help to give you some idea.