How to Identify Bullseye Puffer

To identify Bullseye Puffer (Sphoeroides annulatus), look at these key features.

Physical Characteristics

Body shape

rounded

Coloration

Dorsal surface is typically olive-brown to grayish, often mottled with darker spots and irregular markings. The ventral side is white. A prominent dark, ring-like spot (the 'bullseye') is usually present on the dorsal midline, just anterior to the dorsal fin. Some individuals may have smaller dark spots scattered over the body. Fins are generally translucent to yellowish.

Scale type

none

Mouth position

terminal

Distinctive features

Robust, somewhat flattened body., Small, spiny prickles covering much of the body, particularly on the dorsal and lateral surfaces, which can be erected when inflated., A single, prominent dark ring-like spot (bullseye) on the back, anterior to the dorsal fin., Small, beak-like mouth with fused teeth.

Dorsal fin

Single dorsal fin, relatively small and set far back on the body, typically with 10-12 soft rays.

Tail fin

Caudal fin is truncate to slightly rounded.

Pectoral fin

Pectoral fins are broad and fan-like, positioned laterally.

Distinctive fins

No pelvic fins. Anal fin is similar in size and shape to the dorsal fin, positioned directly below it, typically with 9-11 soft rays.

Identification Tips

1. 1

   Body Shape and Texture

   Look for a robust, somewhat flattened body covered in small, retractable spines (prickles) that are more evident when the fish is handled or stressed.

2. 2

   Coloration and Markings

   The most definitive feature is the prominent dark, ring-like spot (bullseye) on the dorsal surface, just in front of the dorsal fin. The overall body color is typically olive-brown to grayish with a white belly.

3. 3

   Fin Arrangement

   Note the absence of pelvic fins and the small, posteriorly placed dorsal and anal fins, characteristic of pufferfishes.

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