IUCN threat status:

Near Threatened (NT)

Comprehensive Description

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Description

 The body is comparatively high-backed and laterally compressed in mid-sized specimens but low-backed and almost cylindrical in large specimens. In large specimens a pronounced nuchal hump is present, in smaller specimens it is only weakly developed or absent. The maximum body depth is at the origin of the dorsal fin. The head is short and blunt with a convex ventral profile and a slightly convex to straight dorsal profile (Figs 10, 11). The mouth is terminal or slightly sub-terminal with two pairs of short barbels (Table 2).The body depth is usually greater than the head length (Fig. 12).The eyes are slightly protuberant and lie at the end of the anterior half of the head. The morphometric characters are summarised in Table 1.  The dorsal fin usually has four unbranched and nine to 11 branched rays (Table 3). The last unbranched ray is ossified but not very thick and flexible in its distal part. It is usually shorter than the head (Fig. 4). The anal fin usually has three unbranched and five or six branched rays (Table 4).  There are 31 to 38 scales in the lateral line (Table 5), 4.5 to 6.5 scales above the lateral line (Table 6), four to six scales below the lateral line (Table 7) and 12 to 16 scales around the least circumference of the caudal peduncle (Table 8). The scales are shown in Fig. 5.  The pharyngeal teeth count is 2.3.5-5.3.2 in two specimens, 2.3.5- in 11 specimens, -5.3.2 in two specimens and 1.3.5- in one specimen. The pharyngeal teeth are hooked at their tips (Fig. 6).  Small live specimens are silvery; larger specimens are silvery or bronze coloured and sometimes have yellow pectoral and ventral fins (Fig. 11). Small ethanol-preserved specimens are silvery with a somewhat darker back and a salmon pink hue. Juveniles have a dark lateral spot on the caudal peduncle. Ethanol-preserved adults are yellow-brown and the back is only slightly darker than the rest of the body (Fig. 10).  The maximum length observed in the material examined is 385 mm SL.  Carasobarbus chantrei differs from Carasobarbus apoensis, Carasobarbus canis, Carasobarbus exulatus, Carasobarbus luteus and Carasobarbus sublimus in having 31 to 38 scales in the lateral line vs. 27 to 32, 29 to 35, 26 to 32, 25 to 33 and 27 to 29 respectively and modally 14 scales around the least circumference of the caudal peduncle vs. 12. It differs from Carasobarbus kosswigi and Carasobarbus sublimus in having a crescent-shaped lower lip without median lobe vs. a spatulate lower lip with median lobe and from Carasobarbus exulatus, Carasobarbus fritschii and Carasobarbus harterti in modally having 10 branched dorsal-fin rays vs. nine.

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© Kai Borkenhagen, Friedhelm Krupp

Source: ZooKeys

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