How to Identify Siamese Fighting Fish

To identify Siamese Fighting Fish (Betta), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Wild Betta splendens are typically dull brown to green with some red or blue iridescence. Captive-bred varieties exhibit an extraordinary range of colors including red, blue, green, black, white, yellow, orange, purple, and multi-colored patterns (e.g., 'marble', 'koi', 'galaxy').

Scale type

ctenoid

Mouth position

superior

Distinctive features

Labyrinth organ for air breathing, Protruding lower jaw, Large, often elaborate fins in males (especially captive-bred), Opercular membrane (gill cover) can be flared during aggression or display

Dorsal fin

Typically short and rounded in wild types, but can be greatly elongated and fan-like in captive males.

Tail fin

Variable; wild types have short, rounded caudal fins. Captive varieties include veil tail, halfmoon, delta, super delta, crowntail, plakat (short-finned), and double tail.

Pectoral fin

Small and rounded, used for maneuvering.

Distinctive fins

Pelvic fins are long and filamentous, often extending beyond the body, resembling feelers.

Identification Tips

1. 1

   Fin Morphology

   Observe the length and shape of the fins. Wild Betta splendens have shorter, more rounded fins compared to the exaggerated finnage of most captive-bred males.

2. 2

   Coloration

   Wild specimens are typically drab brown/green. Bright, iridescent colors are indicative of captive breeding.

3. 3

   Labyrinth Organ

   While not externally visible, the behavior of surfacing to gulp air is a strong indicator of a labyrinth fish, characteristic of Betta species.

4. 4

   Aggressive Display

   Males will flare their gills and fins when confronted by another male or their reflection, a distinctive territorial behavior.

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