Pangasianodon hypophthalmus (Sauvage, 1878)

Wibowo, Kunto, Muslim, Muslim, Afrisal, Muhammad, Priyadi, Agus, Kusumah, Ruby V. & Lukman, Lukman, 2024, First records of two siluriform fishes: Bagrichthys micranodus (Actinopterygii: Siluriformes: Bagridae) and Pangasianodon hypophthalmus (Pangasiidae) from Sumatra, Indonesia, Acta Ichthyologica et Piscatoria 54, pp. 95-101 : 95

Pangasianodon hypophthalmus (Sauvage, 1878)

Fig. 1B , 1C

Material examined.

MZB. 26911, 202.9 mm SL, MZB.26912, 206.0 mm SL, Cala Lake , Musi Banyuasin, South Sumatra, Indonesia, 10 August 2023, collected by K. Wibowo, R. V. Kusumah, A. Priyadi, and L. Lukman.

Description.

Measurements shown in Table 1 . Head somewhat depressed, with pointed snout (lateral view). Body elongated, compressed. Head and body covered by smooth skin. Eye oval, situated slightly below horizontal axis of body. Mouth wide, terminal; upper and lower jaws nearly equal, with a band of villiform teeth; upper jaw teeth entirely covered by lower jaw when mouth closed; vomer with narrow, elongated tooth bands. Gill openings wide; gill membranes free, not bound to isthmus or to each other. Lateral line complete, midlateral. Anus and urogenital openings situated closer to anal-fin base than to pelvic fin. Two pairs of barbels present. Maxillary barbel simple, longer than mandibular barbel; maxillary barbel beyond margin of opercle but not reaching pelvic fin base; mandibular barbel simple, its length less than eye diameter in MZB.26911, about twice eye diameter in MZB.26912. Dorsal fin with 2 spines and 7 rays; first very small, hidden under skin; second long, compressed, robust, shorter than two anterior branched rays; posterior margin with several tiny serrae; origin of dorsal fin above level of pectoral fin spine tip. Adipose fin small, positioned closer to caudal fin base than to dorsal fin. Pectoral fin with 1 spine and 10 rays; spine robust, posterior margin with 24 or 25 serrae, spine shorter than two anterior branched rays; tip of adpressed fin not reaching pelvic-fin origin; dorsal edge of pectoral-fin base about level with ventral margin of orbit. Pelvic fin with 8 rays; fin origin level with midpoint of dorsal-fin base; tip of adpressed fin reaching base of fifth or sixth anal-fin ray. Anal fin with 34 rays; fin base long, equal to about one third standard length; branched rays progressively shorter posteriorly. Caudal fin with 8 + 9 principal rays, deeply forked; upper and lower lobes pointed.

Fresh specimen coloration.

(Fig. 1B , 1C ). Head and body black dorsally; lateral and ventral surfaces of body pale whitish or silvery; two black lateral stripes joining anteriorly above pectoral fin base. All fins blackish; middle of anal fin with darker stripe; upper and lower caudal fin lobes each with dark grey stripe.

Figures

Figure 1. Photographs of fresh specimens of (A) Bagrichthys micranodus, MZB. 26910, 179.1 mm SL, (B) Pangasianodon hypophthalmus, MZB. 26911, 202.9 mm SL, and (C) P. hypophthalmus, MZB. 26912, 206.0 mm SL, collected from Cala Lake, South Sumatra.