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Siluriformes (Catfishes) >
Siluridae (Sheatfishes)
Etymology: Wallago: wallago;Bleeker, in 1851, took the Indian fish name, gave it generic range and used it connection with a new species. The name is "walaga" in Telugu / Tamil (Ref. 45335).
Eponymy: Lieutenant-Colonel J M van Leer was a Dutch army physician who was a colleague of Bleeker’s. He was for a time the Directing Surgeon at Samarang, East Sumatra. He provided the holotypes of these species. (Ref. 128868), visit book page.
More on author: Bleeker.
Environment: milieu / climate zone / نطاق العمق / distribution range
البيئة
; المياه العذبة القاع; سمكة نهرية (Ref. 51243). Tropical; 10°N - 8°S
Asia: Thailand to Indonesia. Reports of this species from the Mekong River basin are misidentifications of Wallgo micropogon (Ref. 51260).
الحجم / وزن / العمر
النضج: Lm ? range ? - ? cm
Max length : 150 cm TL ذكر/ مختلط الجنس; (Ref. 7050); أعلا وزن تم نشرة: 86.0 kg (Ref. 2091)
الأشواك الظهرية (المجموع) : 1; الأشعة الظهرية الناعمة (المجموع) : 4; أشعه شرجية لينه: 60 - 75. Differs from all other congeners by having a jet black pectoral-fin membranes. Branchiostegal rays 15-18 (Ref. 2091). Corner of mouth reaching only to anterior margin of eye (Ref. 7050).
Body shape (shape guide): elongated.
Adults inhabit large streams and rivers (Ref. 12455). Fry occur at the mouth of small streams connected to larger rivers, where the bottom is muddy and with overhanging vegetation (Ref. 56749). Feeds on prawns (Ref. 56749). Oviparous, distinct pairing possibly like other members of the same family (Ref. 205). Fishermen along Kapuas in Indonesia observed that it used to form large migratory schools in Kapuas mainstream but such schools had become less noticeable, and this was attributed to intensive gill netting. Usually consumed fresh or processed as salted fish (Ref. 56749). Reaches more than 150 cm TL (Ref. 7050).
Life cycle and mating behavior
النضج | التكاثر | وضع البيض | بيض | الخصوبة | Larvae
Roberts, T.R., 1989. The freshwater fishes of Western Borneo (Kalimantan Barat, Indonesia). Mem. Calif. Acad. Sci. 14:210 p. (Ref. 2091)
IUCN Red List Status (Ref. 130435: Version 2025-1)
استخدامات بشرية
مصائد: تجاري
أدوات
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مصادر علي الأنترنت
Estimates based on models
Phylogenetic diversity index (مرجع
82804): PD
50 = 0.5312 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00562 (0.00279 - 0.01132), b=3.00 (2.83 - 3.17), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
مستوى غذائي (مرجع
69278): 4.5 ±0.80 se; based on food items.
المرونه (مرجع
120179): عالي, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع أقل من 15 شهر (Assuming Fec > 10,000).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
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