How to Identify Siamese Glassfish

To identify Siamese Glassfish (Parambassis siamensis), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Almost entirely transparent, with a silvery sheen on the operculum and belly. Some individuals may exhibit a faint yellowish or greenish tint. The internal organs and vertebral column are clearly visible.

Scale type

cycloid

Mouth position

superior

Distinctive features

Highly compressed, deep body., Two distinct dorsal fins, the first with spines and the second with soft rays., Large eyes., Absence of scales on the head and often on parts of the body, contributing to transparency., Lateral line often incomplete or absent.

Dorsal fin

Two dorsal fins; the first with 7 spines, the second with 1 spine and 9-11 soft rays. The first dorsal fin is typically higher than the second.

Tail fin

Caudal fin is forked.

Pectoral fin

Pectoral fins are relatively small and transparent.

Distinctive fins

Pelvic fins are small, located ventrally, with 1 spine and 5 soft rays. Anal fin is long, with 3 spines and 9-11 soft rays.

Identification Tips

1. 1

   Transparency

   The most striking feature is its almost completely transparent body, allowing visibility of the spine and internal organs. This distinguishes it from most other freshwater fish.

2. 2

   Dorsal Fins

   Possesses two distinct dorsal fins. The first dorsal fin has 7 strong spines, and the second has 1 spine followed by soft rays. This is a key characteristic of the Ambassidae family.

3. 3

   Body Shape

   Its body is highly compressed laterally and relatively deep, giving it a disc-like appearance when viewed head-on.

4. 4

   Size

   Adults typically reach a maximum standard length of 4-6 cm (1.6-2.4 inches), rarely exceeding 8 cm.

5. 5

   Lateral Line

   The lateral line is often incomplete or interrupted, a feature that can help differentiate it from some similar species.

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