Hypophtalmus



Keywords: un,fao,fisheries,aquaculture,figisculturespecies,pangasius hypophthalmus, aquaculture, culture species
Description: This file contains a global overview of the aquaculture species Pangasius hypophthalmus

Originally known as Pangasius sutchii or Pangasius hypophthalmus. this riverine freshwater species is limited to the Mekong River, the Chaopraya River and possibly the Mekong basins in Cambodia, Lao People's Democratic Republic, Thailand and Viet Nam, together with the Ayeyawady basin of Myanmar, within a range of 19 °N to 8 °N. The species has a variety of common English names including Sutchi catfish, iridescent shark-catfish, and striped catfish. It is called ‘Pa sooai’ and ‘Pa sooai khaeo’ in Laotian, ‘Pla Sawai’ in Thai, ‘Pra’ and ‘Trey pra’ in Khmer and ‘Cá Tra’ in Vietnamese.

Like all Pangasiid species, P. hypophthalmus is a highly migratory riverine fish species that makes long-distance migrations over several hundred kilometres (potamodromous) between upstream refuge and spawning habitats and downstream feeding and nursery habitats. P. hypophthalmus is omnivorous, feeding on algae, higher plants, zooplankton, and insects, while larger specimens also take fruit, crustaceans and fish.

Mature fish can reach a maximum standard total length of 130 cm and up to 44 kg in weight. This species is benthopelagic, typically living within the ranges of pH 6.5-7.5 and 22-26 °C. Females take at least three years to reach sexual maturity in captivity (being then over 3 kg in weight), while males often mature in their second year, probably taking about the same time in the wild. A mature 10 kg female can spawn over one million eggs. Wild broodstock typically spawn twice annually but in cages in Viet Nam have been recorded as spawning a second time 6 to 17 weeks after the first spawning.

The life cycle of P. hypophthalmus is intimately tied to the annual monsoon flood cycle, with spawning taking place in May - June at the start of the monsoon season. In the dry season this and other species congregate and shelter in the deeper refuge areas. The spawning habitat consists of rapids and sandbanks interspersed with deep rocky channels and pools. The eggs are sticky eggs and are deposited onto the exposed root systems of rheophilic tree species like Gimenila asiatica.

Aquaculture introductions have taken place to several other Asian countries including Bangladesh, China, India, Indonesia, Malaysia and Myanmar.






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