How to Identify Black Phantom Tetra

To identify Black Phantom Tetra (Hyphessobrycon megalopterus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Males are predominantly smoky-grey to black, with a prominent black humeral spot bordered by a vertical white or iridescent bar. Their dorsal, anal, and caudal fins are typically dark, often black. Females are lighter, brownish-grey, with a less intense humeral spot, and distinct reddish pelvic and adipose fins. Both sexes have clear pectoral fins.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent black humeral spot on the flank, just behind the gill cover., Sexual dimorphism: males have larger, more elaborate dorsal and anal fins; females have reddish pelvic and adipose fins and a rounder body shape., Iridescent scales, especially noticeable under certain lighting.

Dorsal fin

Males possess a tall, sail-like dorsal fin, often black. Females have a shorter, more rounded dorsal fin.

Tail fin

Forked caudal fin, typically clear to dusky.

Pectoral fin

Small, clear, and fan-shaped.

Distinctive fins

Males have elongated anal fins. Females have reddish pelvic and adipose fins.

Identification Tips

1. 1

   Humeral Spot

   Look for the distinct black spot behind the gill cover. This is a key identifier for both sexes.

2. 2

   Fin Shape (Males vs. Females)

   Observe the dorsal and anal fins. Males have significantly larger, more pointed, and often darker fins. Females have shorter, rounder fins and a reddish tint to their pelvic and adipose fins.

3. 3

   Body Coloration

   Males are generally darker, a smoky-grey to black, while females are lighter, brownish-grey with a more pronounced reddish hue on their lower fins.

4. 4

   Schooling Behavior

   Black Phantom Tetras are typically found in schools. Observing their collective behavior can help confirm identification in a mixed group of tetras.

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