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Scientific Name: Wallago attu (Bloch & Schneider, 1801)
English Name: Wallago, Helicopter catfish
Local/Bangla Name: Boyal (বোয়াল)
Bonyfish : Wallago attu

Photo: Warren T (Fishbase)

Classification:
Kingdom: Animalia
Phylum: Chordata
Class: Teleostei
Order: Siluriformes
Family: Siluridae
Description:
It has broad head with depressed snout. Body is elongated, and strongly compressed. Mouth is very deeply cleft. Vomerine teeth are present in two small patches. Two pairs of barbels are present; maxillary barbels extending to anterior margin posterior of anal fin, mandibulary barbels to angle of mouth. Eyes are small. Dorsal fin small and anal fin very long. Mandibular barbels are longer than pelvic fin. Dorsal soft rays (total): 5; Anal soft rays: 77 – 97.
Habitat & Distribution in Bangladesh:
Occur in rivers, pools, ponds, beels, baors. Associated with deep, still or slow-flowing water with a mud or silt substrate.
Environment:
Freshwater, Brackish (Demersal; potamodromous)
Main References:

Rahman AKA 2005 Freshwater Fishes of Bangladesh, 2nd ed., Zool. Soc. Bangladesh, Dhaka, Bangladesh, xviii + 394 pp.

Other References:

Hossain M, Wahab M, Belton B (2012) The Checklist of the Riverine Fishes of Bangladesh. FAN Bangladesh. 1. 29-39.

Siddiqui KU, Islam MA, Kabir SMH, Ahmad M, Ahmed ATA, Rahman AKA 2005 Freshwater Fishes of Bangladesh, 2nd ed., Zool. Soc. Bangladesh, Dhaka, Bangladesh, xviii + 394 pp. AKA, Haque EU, Ahmed ZU, Begum ZNT, Hassan MA, Khondker M, Rahman AKA 2005 Freshwater Fishes of Bangladesh, 2nd ed., Zool. Soc. Bangladesh, Dhaka, Bangladesh, xviii + 394 pp. MM (eds.) 2007 Encyclopedia of Flora and Fauna of Bangladesh, Vol. 23. Freshwater Fishes. Asiatic Society of Bangladesh, Dhaka 300 pp.

IUCN Bangladesh (2015) Red List of Bangladesh Volume 5: Freshwater Fishes. IUCN, International Union for Conservation of Nature, Bangladesh Country Office, Dhaka, Bangladesh, pp xvi+363

DoF Bangladesh (2023) Album: Freshwater Fishes of Bangladesh, Department of Fisheries, Ministry of Fisheries and Livestock, Bangladesh, Dhaka. 200 pp.

Ahmed MS, Datta SK, Zhilik AA (2020) Molecular diversity of freshwater fishes of Bangladesh assessed by DNA barcoding. Bangladesh Journal of Zoology, 48(1), 1-19.

Giri SS ed, 2017 Monographs on Threatened Freshwater Fishes of South Asia. SAARC Agriculture Centre, Dhaka, Bangladesh, 305 p.

Mahalder B, Mustafa MG (2013) Introduction to fish species diversity: Sunamganj haor region within CBRMP's working area. Community Based Resource Management Project-LGED, Worldfish, Dhaka, Bangladesh, 75.

Froese R, Pauly D (Editors) (2024) FishBase. World Wide Web electronic publication. www.fishbase.org, version (02/2024).

DNA Barcodes from Bangladesh
GenBank Accession Number:
COI: KX657717 MH087042  
Other DNA Barcodes & Nucleutide Sequences
Global IUCN conservation status:
BD IUCN conservation status:
Other Information