How to Identify Goldtail Parrotfish

To identify Goldtail Parrotfish (Sparisoma auropurpureum), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Terminal Phase (TP) males are generally greenish-blue with a prominent golden-yellow caudal fin (tail) and often a yellow patch on the operculum. Initial Phase (IP) individuals (females and some males) are typically reddish-brown to purplish-brown, often with lighter mottling or bars, and a reddish or purplish caudal fin. Juveniles resemble IP individuals but may have more pronounced banding.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Strong, fused beak-like teeth for scraping algae from hard substrates., Large, cycloid scales., Sexual dichromatism, with distinct color patterns between initial and terminal phases., Golden-yellow caudal fin in terminal phase males.

Dorsal fin

Typically IX spines, 10 soft rays. Continuous, with a relatively low profile.

Tail fin

Truncate to slightly emarginate in initial phase, becoming more truncate or slightly rounded in terminal phase males, with the characteristic golden-yellow coloration.

Pectoral fin

13-15 rays, relatively large and fan-like.

Distinctive fins

Pelvic fins are thoracic, with one spine and five soft rays. Anal fin has III spines and 9 soft rays.

Identification Tips

1. 1

   Caudal Fin Color (Terminal Phase)

   The most distinguishing feature of the terminal phase male is its bright golden-yellow caudal fin, which contrasts sharply with its greenish-blue body.

2. 2

   Body Coloration (Initial Phase)

   Initial phase individuals are generally reddish-brown to purplish-brown, often with subtle mottling or bars, and lack the prominent golden tail.

3. 3

   Beak-like Mouth

   Like all parrotfish, Sparisoma auropurpureum possesses a fused, beak-like mouth structure used for scraping algae from hard surfaces.

4. 4

   Size

   Adults can reach a maximum standard length of approximately 40 cm (16 inches).

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