How to Identify GloFish Tetra

To identify GloFish Tetra (Gymnocorymbus ternetzi (variedade GloFish)), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The base body shape is that of the Black Skirt Tetra, but the GloFish varieties exhibit a range of intense fluorescent colors including 'Starfire Red', 'Electric Green', 'Sunburst Orange', 'Cosmic Blue', 'Galactic Purple', and 'Moonrise Pink'. These colors are due to the expression of genes from naturally occurring fluorescent proteins found in jellyfish or sea anemones.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Vibrant, genetically engineered fluorescent coloration, Two prominent vertical black bars on the anterior body (retained from the wild type), Large, flowing dorsal and anal fins (especially in long-finned varieties)

Dorsal fin

Single, tall, and triangular, often with a dark leading edge.

Tail fin

Forked, transparent to slightly colored.

Pectoral fin

Small and clear.

Distinctive fins

The anal fin is notably long and deep, extending from behind the pelvic fins almost to the caudal peduncle, giving the fish a 'skirted' appearance, particularly in the original Black Skirt Tetra and its GloFish variants.

Identification Tips

1. 1

   Coloration

   The most obvious identifier is the intense, unnatural fluorescent color (red, green, orange, blue, purple, pink) which glows under specific lighting conditions. This distinguishes them immediately from naturally colored fish.

2. 2

   Body Shape and Fins

   Observe the compressed body, the two vertical black bars (though sometimes less prominent in certain GloFish varieties), and the characteristic long, deep anal fin, which is a hallmark of the Black Skirt Tetra lineage.

3. 3

   Behavior

   They are active, schooling fish that typically swim in the mid-level of the aquarium. Their peaceful nature is also a key behavioral identifier.

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