How to Identify Jau

To identify Jau (Zungaro zungaro), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Adults typically exhibit a mottled or marbled pattern of dark brown, olive-green, or greyish-brown over a lighter, yellowish to cream background. The ventral side is usually lighter. Juveniles may have more pronounced spots or bands. The coloration provides excellent camouflage in murky river waters.

Scale type

none

Mouth position

terminal

Distinctive features

Large, broad, and somewhat flattened head, Wide mouth with numerous small, conical teeth arranged in bands, Three pairs of barbels: one maxillary pair (the longest, extending beyond the pectoral fins) and two mental pairs (shorter), Adipose fin present and relatively large, Absence of scales (typical for catfishes)

Dorsal fin

Short, with a strong, serrated spine and 6-7 soft rays. The spine can inflict a painful wound.

Tail fin

Deeply forked, powerful, and symmetrical.

Pectoral fin

Large and broad, with a strong, serrated spine and several soft rays. The pectoral spines are also capable of inflicting painful wounds.

Distinctive fins

The adipose fin is prominent and fleshy, located between the dorsal and caudal fins.

Identification Tips

1. 1

   Size and Body Shape

   One of the largest catfishes in its range, with a robust, elongated body and a noticeably large, broad head.

2. 2

   Coloration

   Mottled or marbled dark brown/olive-green over a lighter background, providing excellent camouflage.

3. 3

   Barbels

   Possesses three pairs of barbels, with the maxillary pair being exceptionally long, extending past the pectoral fins.

4. 4

   Fins

   Strong, serrated spines in the dorsal and pectoral fins. A prominent adipose fin and a deeply forked caudal fin.

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