How to Identify Siamese Fighting Fish

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

Physical Characteristics

Body shape

elongated

Coloration

Wild Betta splendens are typically dull brown or green with short fins. 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, Elaborate, flowing fins in captive males, Aggressive territorial behavior, especially between males, Flaring of gill covers and fins as a display of aggression or courtship

Dorsal fin

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

Tail fin

Caudal fin varies significantly in captive breeds (e.g., veil tail, halfmoon, crowntail, plakat, delta tail). Wild types have short, rounded caudal fins.

Pectoral fin

Small and fan-shaped, used for maneuvering.

Distinctive fins

Pelvic fins are long and slender, often resembling feelers, particularly in males.

Identification Tips

1. 1

   Fin Morphology

   Wild Betta splendens have short, rounded fins. Captive-bred males have significantly longer, more elaborate fins (e.g., veil, halfmoon, crowntail). Females and 'plakat' (short-finned) males have shorter fins.

2. 2

   Coloration

   Wild bettas are typically drab brown/green. Captive bettas display a vast array of vibrant colors and patterns due to selective breeding.

3. 3

   Labyrinth Organ

   Observe the fish surfacing to gulp air, a clear indication of a labyrinth fish. This organ is located above the gills.

4. 4

   Aggressive Behavior

   Males will typically flare their gills and fins at reflections or other males, a characteristic display of aggression.

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