Silurus macrostomus is a Junior Synonym of Wallago attu.

Wallago attu (Bloch and Schneider, 1801)

Freshwater Shark - Boal - Native Fish - Wild (Freshwater)

view: Lateral [Mohsin, 2019b]

Systematic Position: [2]

Kingdom	:	Animalia
Phylum	:	Chordata
Class	:	Teleostei
Order	:	Siluriformes
Family	:	Siluridae
Genus	:	Wallago
Species	:	Wallago attu

Common Names:

English	:	Freshwater Shark[729]
Bangla	:	Boal[5] Bal[274] Boall[274] Boiarl[274] Kiali[274] Poiel[274] Goaal[729] Boyel[729] Boyari[729] Poyel[729]

Synonyms:

Silurus attu Bloch and Schneider, 1801
Wallagonia attu (Bloch and Schneider, 1801)
Wallagonia athu (Bloch and Schneider, 1801)
Wallagu attu (Bloch and Schneider, 1801)
Silurus boalis Hamilton, 1822
Silurus macrostomus Swainson, 1839
Callichrous macrostomus (Swainson, 1839)
Silurus wallagoo Valenciennes, 1840 Jan
Silurus wallago Valenciennes, 1840 Jan
Silurus muelleri Bleeker, 1846 Jul
Silurus mulleri Bleeker, 1846 Jul
Wallago russellii Bleeker, 1853 Nov
Wallago russelli Bleeker, 1853 Nov
Wallago attu valeya Deraniyagala, 1953 Oct
Pinniwallago kanpurensis (Non Gupta et al, 1981 Mar)

Maximum Length and Weight:

186 mm (TL) ^[347] 47 cm (TL) ^[5] 47 cm (TL) ^[5]

Inter-Length Relationship:

Head length : Total length : Standard length = 1 : 4.5-5.2 : 4.1-5.2 ^[5]
Body height : Total length : Standard length = 1 : 6-6.8 : 5.5-6 ^[5]
Eye Diameter : Head length = 1 : 7.4-9 ^[5]
Eye Diameter : Snout length = 1 : 2.8-3.5 ^[5]
Eye Diameter : Inter orbial width = 1 : 2.8-3.8 ^[5]

Taxonomic Formula:

D. 5; P₁. 1/13-14; P₂. 10; A. 85-89 ^{[Rahman, 2005]}
D 5; A iii 74-93; P I 13-15; V i 7-9 ^{[Talwar and Jhingran, 1991]}
B XIX-XXI; D 5; A 86-93(4/82-89); P 1/13-15; V 8-10; C 17 ^{[Shafi and Quddus, 1982]}

Scales:

Scaleless. [5]

Chemistry:

Data not available

Conservation Status:

Global	:	Near Threatened (NT)	(Version 3.1) [543]
Bangladesh	:	Vulnerable (VU)	(Version 3.1) [241]

Occurrence/Distribution:

Global	:	Afghanistan[825] Bangladesh[70] Cambodia[823] China[890] India[6] Indonesia[449] Laos[994] Malaysia[6] Myanmar[832] Nepal[740] Pakistan[741] Sri Lanka[90] Thailand[837] Vietnam[871]
Bangladesh	:	Padma river, Rajshahi[274] Chalan beel, Natore[490] Halda River, Chittagong Hill Tracts[598] Andharmanik river, Patuakhali[751] Sunamganj haor region, Sunamganj[729] Passur River, Khulna[752] Kaptai reservoir (Kaptai lake), Rangamati[753] Mahananda River, Chapainawabganj[775] Meghna river estuary, Noakhali[774] River Choto Jamuna, Naogaon[9] Tulsiganga River, Joypurhat[780] Meghna river, Narsingdi[781] Dhepa river, Dinajpur[779] Borulia haor, Kishoreganj[794] Chitra river, Jashore[793] Buriganga River, Dhaka[798] Old brahmaputra, Mymensingh[796] Talma River, Panchagarh[800] Little feni river, Feni[795] Someshwari river, Netrokona[806] Jamunashwori river, Rangpur[808] Nabaganga river, Narail[809] Bhairab river, Jashore[807] Atrai River, Dinajpur[815] Banar River, Mymensingh[1023] Bangshi River, Dhaka[1024] Tanguar Haor, Sunamganj[1025] Kishoreganj Haor Region, Kishoreganj[1026] Punarbhaba, Dinajpur[1161] Ramnabad river, Patuakhali[1163] Dekhar haor, Sunamganj[1164] Feni river, Feni[1165] Muhuri river, Feni[1165] Shakla heel, Brahmanbaria[1167] Balla beel, Moulvibazar[1168] Titas river, Brahmanbaria[1169] Lohalia river, Patuakhali[1200] Ghaghat river, Gaibandha[1202] Sandha river, Pirojpur[1206] Belua river, Pirojpur[1207]

Habitat and Environment:

Habitat:
Canal, Beel, Haor, Baor, River ^[347]

Environment:

Parameters	Units	Minimum	Maximum	Optimum	Ref.
Temperature	-	-	-	-	-
pH	-	-	-	-	-
DO	-	-	-	-	-
Free CO2	-	-	-	-	-

Breeding Maturity:

Data not available

Breeding Season: (red background)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

[274]

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

[347]

Fecundity:

Data not available

Food and Feeding Habit:

Diet composition (%): Data not available

Importance:

Production and Marketing:
Production/Harvesting Season: (Green = Peak, Yellow = Off, Lemon = Moderate)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

[792]

Harvesting Gears:
Seine net, Push net, Cast net ^[792]
Market price:
400-500 BDT/kg (Size: 100-120 cm, Weight: 3-4 kg, Place: Noakhali, Bangladesh) ^[792]