Description
As with most of the genus Sillago, the trumpeter whiting has a slightly compressed, elongate body tapering toward the terminal mouth. The body is covered in small ctenoid scales, including the two rows of cheek scales. The first dorsal fin has 11 spines and the second dorsal fin has 1 leading spine with 19 to 20 soft rays posterior. The anal fin is similar to the second dorsal fin, but has 2 spines with 19 to 21 soft rays posterior to the spines. Other distinguishing features include 71 to 75 lateral line scales and a total of 34 to 36 vertebrae. The species has a known maximum length of 30 cm and a maximum recorded weight of 216 grams.
The swimbladder has a short anterior median extension and two anterolateral extensions present, with a complex network of tubular canals that rejoin the swimbladder at four locations anteriorally. Lateral extensions reach to the duct like process present on the ventral surface of the swimbladder.
The body is a sandy brown to olive green colour above, while the sides and lower body are a silvery brown to cream-white hue. The head is dark olive brown to greenish above, while the cheeks and opercles are golden-green, with a dark blotch on the opercle of some individuals. The trumpeter whiting is usually easy to distinguish by its characteristic dark brown irregular blotches present on the side of the fish, as well as a golden silver longitudinal band. The spinous dorsal fin is whitish, with a mottled olive green and brown texture. The soft dorsal fin has about five rows of brownish green spots. The anal and ventral fins are golden to yellow with cream margins, while the pectoral fins are yellow to pale yellow-green, with a distinct black-blue spot at the base. The caudal fin is olive brown to a darkish green-brown with darker margins.
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