Walking Catfish

Notes

The distribution of Clarias batrachus is restricted to Java, Indonesia (Ng and Kottelat 2008). The species is widely introduced for cultivation, but originated from an Indochinese subpopulation that may represent undescribed species (Ng and Low 2019). The previously-identified population of C. batrachus in north-eastern India is presently known as Clarias magur . Other populations were known as Clarias aff. batrachus ‘Indochina’ (from Mekong River drainage) and Clarias aff. batrachus ‘Sundaland’ (from the Malay Peninsula and Borneo) (Fig. 19).

Freshwater fishes (Actinopterygii) of Kenyir Reservoir, Peninsular Malaysia: Updated checklist, taxonomic concerns and alien species

Clarias batrachus

Clarias batrachus: UMMZ 155803, 5 ex., 130.7-151.8 mm SL; Java: vicinity of Singaparna . UMMZ 155807, 4 ex., 168.6-212.8 mm SL; Java: vicinity of Bandung . UMMZ 217576, 10 ex., 98.2-167.9 mm SL; Thailand: Ubon Ratchathani province, Huay Thomloe at Ban Bung Rhee-Lek, 7 km E of Khemerat, 2.5 km from Mekong River .

Clarias insolitus, a new species of clariid catfish (Teleostei: Siluriformes) from southern Borneo.

materials_examined

Other material examined: UMMZ 155807 (3), 168.0 – 215.0 mm SL; data as for neotype. UMMZ 70684 (1), 101.2 mm SL; Java: Kali Mandiku Jember. UMMZ 155704 (3), 193.1 – 206.2 mm SL; Java: vicinity of Bogor. UMMZ 155708 (3), 136.8 – 153.0 mm SL; UMMZ 155710 (5), 55.3 – 139.0 mm SL; UMMZ 155711 (5), 162.0 – 209.0 mm SL; Java: Ranu Lamongan, lake at Klakah. UMMZ 155709 (1), 172.2 mm SL; Java: Ranu Klidungan. UMMZ 155801 (1), 116.6 mm SL; Java: Cikedang, tributary to Citanduy, 1.5 km N of Ciawi. UMMZ 155802 (2), 128.7 – 131.9 mm SL; Java: Ciwalen, tributary of Citanduy at Godebak between Panaunbangan and Panjalu. UMMZ 155803 (5), 128.0 – 152.0 mm SL; Java: vicinity of Singaparna. UMMZ 155805 (3), 81.8 – 159.7 mm SL; Java: Citi’is (creek), just below road near mouth in Cimanuk, 3 km N of Garut. UMMZ 155806 (3), 153.6 – 183.9 mm SL; Diagnosis: Clarias batrachus is distinguished from all Asian congeners in having a narrow snout, in dorsal view with straight lateral outline and convex anteriorly (Fig. 1). It can be further distinguished from all Asian congeners in having a unique combination of the following characters: 63 – 74 dorsal-fin rays (vs. 82 – 108 in C. nigricans, C. nieuhofii and C.

discussion

Remarks. Clarias aff. batrachus remains imprecise as the literature has so far propose that there may be four valid species of Indian, Indochinese, Javan or Sundaland origins. Currently, the authorities have classified specimens from Borneo and the Malay Peninsula to be C. aff. batrachus " Sundaland " until the taxon is further investigated (Ng & Kottelat, 2008; Lee & Sulaiman, 2015).

Provisional checklist of freshwater fish diversity and distribution in Perak, Malaysia, and some latest taxonomic concerns