The anal fin has 3 spines followed by 22-25 rays.

The anal fin has two spines followed by a single spine and 15 or 16 soft rays.

The anal fin has 2 anteriorly detached spines followed by 1 spine and 18 to 20 soft rays.

The anal fin has 2 spines followed by 14 to 17 soft rays.

There are two separate dorsal fins, the first containing 8 spines while the second has a single spine followed by 24 to 27 soft rays.

The anal fin has two spines followed by 17 soft rays.

There two separate dorsal fins are composed of eight spines and one spine followed by 31 to 35 soft rays, respectively.

The dorsal fin is in two parts, the first containing 7 spines and the second of 1 spine followed by 25 to 28 soft rays.

There are two separate dorsal fins, the first with eight spines and the second with a single spine followed by 19 to 22 soft rays.

The procedure often involves injection of contrast medium into the cervical or lumbar spine, followed by several X-ray projections.