How to Identify Saddleback Clownfish

To identify Saddleback Clownfish (Amphiprion polymnus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Body dark brown to black, sometimes with a yellowish tint. Two prominent white to yellowish vertical bars. The anterior bar is narrow, located behind the eye. The posterior bar is broad, saddle-shaped, covering the dorsal fin and extending onto the upper flank. Snout and lips often yellowish. Pectoral, pelvic, and anal fins are typically yellow to orange, sometimes with black margins. Caudal fin is white to yellowish.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Two white/yellowish vertical bars, with the posterior bar being saddle-shaped., Dark body coloration (dark brown to black)., Yellowish fins, especially pectoral and caudal.

Dorsal fin

Typically XI (11) spines, 13-17 soft rays. The spiny and soft-rayed portions are continuous.

Tail fin

Rounded to slightly emarginate, white or yellowish.

Pectoral fin

16-19 rays, typically yellow to orange.

Distinctive fins

Pelvic fins are also yellow to orange, often with a black margin. Anal fin has 2 spines and 13-15 soft rays.

Identification Tips

1. 1

   Body Coloration

   Look for the dark brown to black body, which distinguishes it from many other lighter-bodied clownfish species.

2. 2

   Bar Pattern

   The two white or yellowish bars are key. The posterior bar's saddle-like shape, covering the dorsal fin and extending onto the upper body, is a definitive characteristic.

3. 3

   Fin Coloration

   The bright yellow to orange pectoral and caudal fins are often a good indicator, especially in contrast to the dark body.

4. 4

   Host Anemone

   While not a direct physical feature of the fish, observing its host anemone can sometimes aid in identification, as certain clownfish species prefer specific anemone hosts. A. polymnus commonly associates with Heteractis crispa, Stichodactyla haddoni, and Stichodactyla mertensii.

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