CatFish Domestication of H. wyckioides in Laos
H. wyckioides : here is the first species on which I worked in Laos with the “CIRAD” (French organization for agronomic research and international cooperation for the sustainable development of the tropical and Mediterranean regions).
Description of the species
Vernacular names :
Cambodia: Trey khia Laos: Pa-Kheung Thaï : Pa-khang Viêtnamese : Ca-lang-ngia
This siluriform still little known was first described by Fang and Chaux in 1949. This species is known as d’Hémibagrus wyckioides but it was also known as Macrones or Mystus wyckioides (according to Fang and Chaux, 1949). ). The genus groups nearly 30 species.
Morpho-anatomical description :
The body is free of scales, its skin is smooth, we can note the presence of barbels, four pairs (gustatory organs) and a non-protractile mouth.
It has a first thorny or rigid radius to the pectoral fins, but not on the dorsal fin, there is also the presence of a long adipose fin, and a pelvic fin in the middle and abdominal position.
Identification of the specie H.wyckioides from Kottelat (1998)
Species characterized by a forked caudal fin with luminous red in individuals larger than 15 cm, and whitish in smaller specimens.
– a dorsal fin consisting of 7 to 8 soft rays,
– an anal fin of 12 to 14 rays,
– a fine and long adipose fin representing between 18.7 and 25.7% of the standard length of the fish,
-a short spine, weakly bony and representing 7.5 to 11.4% of the standard length. Its edges are not serrated, the length of the base is between 16.3 and 18.3%.
– A number of vertebrae evaluated between 52 and 53,
The maxillary barbels reach about half of the body (and even more) to the vicinity of the base of the adipose fin. Its head is rather flat than conical and there is a slight protuberance of the occipital bone that does not resemble a basic bone (Rainboth, 1996).
Larval growth (MRC Mekong Fish database 2003) (MRC Mékong Fish database 2003)
Young larva : Pigmentation chromophore presence on the head and stomach.
Larva older: Short belly shape, mouth shape: terminal, spinal framework: no, peritoneal pigmentation: covered with melanophores, pectoral fin pigmentation: without melanophores, pelvic fin pigmentation: without melanophores, food zooplankton.
Post larva : Body shape: elongated, shape of the mouth: wide / terminal Belly shape: elongated, pigmentation on the head and trunk, carnivorous diet.
Originally from Asia, it is a carnivorous species (or omnivorous carnivorous tendency? This point is important for protein needs) that is found exclusively in freshwater under a subtropical climate, it occupies the Mekong and including its branches at the Khone Falls.
It occurs in rocky areas, the Khong district is characterized by rocks, cascades that provide specific habitat for H. wyckioides and at varying depths (Roberts and Baird 1995), it frequents mountain rivers, It also occurs in Indonesia, in Cambodia’s Tonle Sap Lake (Poeu et al, 2004) in the Chao Praya River in Thailand (Vidthayanon et al, 1997)and in the Mekong Basin floodplains. Environment it is essentiallydémersal* et potamodrome* (fish living near the bottom without living there permanently and migrating only in freshwater rivers) Its maximum length known to date is 1.30 m for a weight of 80 kg in a male. It’s a harmless fish (but still bites!). There is sometimes a certain aggressiveness that can be observed towards other people when they are stored together in the same tank or pond.
His diet consists of insects, shrimps, crabs, fish, earthworm, snail, insects …
Different fishing methods are used to catch it such as a line and a hook, as bait, fishermen use species such as Gyrinochelius pennocki or catfish clarias batrachus, fishermen also use nets with different mesh this during the in the dry season and during the rainy season they use toboggan / bamboo traps (Khong Island there were 600 in 2006). Their size depends on their location, they are usually 1.5 meters wide by 10 meters long, most fishermen stay at night or on their traps, but the collect is usually done in the morning to be sold at the market.
Species not on theUICN red List (International Union for the Conservation of Nature) https://www.iucn.org/fr
To follow presentation of a second species, a carp called “Pa-Phone” in Laotian