Lot 3: Field identification tips for Barilius sp.
…..All the specimens in this lot belong to Genus Barilius , represented by at least 3 common species viz., Barilius bendelisis > B. vagra, and > B. barna, in order of abundance.
All of them are most common in the hauls made from the hilly, clean watered, slow to fast running stretched with sandy or pebbly bed both in the eastern and western Doon.
Live specimens of Barilius sp. Mark the presence of Barilius vagra and Barilius bendelisis in the glass jar.
CHARACTERIZATION OF 3 Barilius sp.:
The 3 species of this lot can be segregated on the basis of following characterizations:
- 2 Pairs of barbels:
(a) Barbels shorter than eye diameter, maxillary longer than the rostral. Silvery, with a black spot at the base of each scale and double rows (‘=’) along the lateral line. Younger individuals have faint 8 – 9 vertical blue-black bars (bands) across the back. Opercles shot with gold and often there is a black streak like mark just behind the gill opening (touching the margin of operculum). Fins yellow. Pectorals, pelvics and anal tinged orange. The posterior edge of lower lobe of caudal fin edged black.
……..Barilius bendelisis (Indian Hill Trout)
Barilius bendelisis: Lateral view of a male and a female
More photos of Barilius bendelisis
Barilius bendelisis : Males showing pearl organs and thickened pectoral fin rays. Head of female enlarged to show less of pearl organs on the pointed snout.
(b) Body relatively slender. Lower jaw slightly longer. Rostral barbels quite long (nearly half as long as head) whereas the maxillary shorter. Silvery with a band of coppery hue from behind the upper edge of opercles to the base of caudal, disrupted intermittently by 9 – 10 royal bluish vertical bands on the sides. Fins yellowish, posterior edge of the caudal greyish.
This is the second most dominant species from Doon valley, found at about 300 – 600 m above msl.
Barilius vagra: Lateral view. Mark Silvery body with a band of coppery hue from behind the upper edge of opercles to the base of caudal, disrupted intermittently by 9 – 10 royal bluish vertical bands on the sides. Fins yellowish, posterior edge of the caudal greyish.
More photographs of Barilius vagra
A panoramic view of upstream section river Song at Maldevta (its tributary Bandal; Eastern Doon, Uttarakhand) during April-May months when the water level is reduced to few centimeters in some sections. The Fishes seen jumping / leaping out of water were identified as a large shoal of Barilius vagra and young individuals of Barilius bendelisis. Obviously, the leaping activity (an activity of restlessness) was due to heating up of water with reduced oxygen level.
HABITATS PREFERRED BY Barilius sp.
Asan River: Western Doon (Dehradun district), close to Herbertpur; a stretch upstream of Asan Barrage Bird Sanctury (= Dhalipur Lake), showing a huge swimming flock of the Brahminy Duck or Ruddy Shelduck (Tadorna ferruginea), most popular as ‘Surkhab’ in Hindi.
- Systematic position:
- Barilius vagra, B. barna and youngs of B. bendelisis have ornamental value under a congenial temperature regime of hilly environment.
- All in combination of three are common in Eastern Doon (Song and Suswa River) than in western Doon where B. bendelisis is dominant.