Common seadragon or weedy seadragon (Phyllopteryx taeniolatus) is a marine fish related to the seahorse. Adult common seadragons are a reddish colour, with yellow and purple markings; they have small leaf-like appendages that resemble kelp fronds providingcamouflage and a number of short spines for protection. Males have narrower bodies and are darker than females. Seadragons have a long dorsal fin along the back and small pectoral fins on either side of the neck, which provide balance. Common seadragons can reach 45 cm in length.
The common seadragon is the marine emblem of the Australian State of Victoria. source