Some gurnard or another.

You have caught Bernard the gurnard perch, quite common in in shore waters.

You have to be very careful with them because the spines are poisonous and will cause great pain.

Good eating if you can be bothered taking the risk filletting them

http://fishwrecked.com/content/fishwreckapedia?page=3

Western Fortescue have a creamy body with distinct brown vertical bands.  The tail may also have dark bands and there is a chevron (V) shaped brown band at the caudal fin base.  The lateral line is nearly straight.  The dorsal spines are prominent.  They are sometimes confused with gurnard perch.

Western Fortescue are known to grow to 23cms in length however there is little recorded information. 

They are popular in the aquarium industry.  The dorsal spines are venomous causing intense pain, whether the fish is alive or dead. 

Western Fortescue are found from Kalbarri Western Australia, south to Kangaroo Island South Australia in coastal seagrass beds where they eat crustaceans and small fish.  A similar species, Eastern Fortescue (Centropogon australis) occurs from Queensland to southern New South Wales. 

 thanks for your input guys !!