[fresh water fish] Order Siluriformes Family Pangasiidae(Shark catfishes) Mekong giant catfish Pangasianodon gigas(Chevey, 1931). Max length: 300 cm TL. max. published weight: 350.0 kg. max. reported age: 10 years D/spines 2, soft rays 7-8, A/soft rays 35, Vertebrae/48. Gill rakers/0; rudimentary or absent.
Distribution; Asia/endemic to the Mekong basin in Southeast Asia and adjacent China. Become rare due to overexploitation. International trade banned. General; Grey to white in colour and lacking stripes, fins grey, never black. Posterior nostril located near anterior nostril. The center of the eye above the horizontal line through the mouth angle in juveniles; eye totally below the level of mouth angle in subadults and adults. The maxillary and mandibulary pairs of barbels well developed in juveniles; barbels become rudimentary in subadults and adults; near total lack of barbels. Gigantic size; oral teeth and gill rakers present in small juveniles, absent at about 30-50 cm SL; dorsal, pelvic and pectoral fins without filamentous extensions. Distinguished from other large catfish in the Mekong by its lack of teeth and the almost complete absence of barbels.
A migratory species which occurs in medium to large-sized rivers. As fry, this species feeds on zooplankton in the river and is known to be cannibalistic. After approximately one year, the fish becomes herbivorous, feeding on filamentous algae, probably ingesting larvae and periphyton accidentally. The fish likely obtains its food from algae growing on submerged rocky surfaces, as it does not have any sort of dentition. Little is known on its general pattern of life and migratory journeys for spawning. Shows one of the fastest growth rates of any fish in the world, reaching 150 to 200 kg in 6 years. The Mekong giant catfish once held the Guinness World Records' position for the world's largest freshwater fish in 2005. Attaining an unconfirmed length of 3 m(9.8 ft), It can reportedly weigh up to 350 kg(although the largest sturgeon species can far exceed this size, they are anadromous). Marketed fresh.
|