Description
The Yellowtail trumpeter is a moderate-sized species, growing to a maximum size of 28 cm, but more often observed at around 15 cm. The body is quite deep in profile and is compressed laterally. The upper jaw is slightly longer than the lower jaw. The first gill arch has 6 to 8 gill rakers on the upper limb and 12 or 13 on the lower limb. The dorsal fin has 12 or 13 spines and 8 to 10 soft rays; the spinous part of the dorsal fin is curved, with the fifth spine being the longest, and the final spine the shortest. The anal fin has 3 spines and 8 or 9 soft rays, with the second anal-fin spine longer than the third, but shorter than the longest anal-fin rays. The pored scales in the lateral line number 46 to 54 with 7 to 9 rows of scales above the lateral line and 17 to 19 below it.
The color of the upper portions of the body is grey, with only light pigmentation on the lower part of the body. The upper half of the body has a number of dispersed spots somewhat smaller than the pupil, while some individuals have 5 or 6 incomplete vertical bars extending from the dorsal fin surface of the body, down to the level of the pectoral fins. The fins are generally yellow in colour, with a variety of dusting and blotching. The spinous dorsal fin has irregular spotting and a faint duskiness distally, but does not exhibit a distinct patch of dark pigmentation. The soft dorsal fin is dusky at the base while the spinous portion of anal fin is also slightly dusky. The caudal fin is also spotted basally, with a highly distinct, black blotch extending obliquely across each lobe.
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