Henicorhynchus lobatus Smith, 1945

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Cypriniformes \| Cyprinidae
Synonyms	Cirrhinus lobatus, ... more
Common names	Ostroretka mekongská, Pa soi houa lem, Pba soi hang leuang, ... more

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Main reference

Roberts, T.R. 1997. (Ref. 33488)
Other references | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 15.0 cm SL male/unsexed; (Ref. 30857)

Environment

Benthopelagic; potamodromous (Ref. 51243); freshwater

Climate / Range

Tropical

Asia: known only from the Mekong basin.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 0; Dorsal soft rays (total): 8; Vertebrae: 32. A small species, largest recorded specimen just over 10 cm SL; snout but not always strongly projecting; head relatively small, especially compared to the closely related and somewhat larger species C. siamensis; differs from all other species of Cirrhinus so far as known in being a protogynous hermaphrodite (Ref. 33488). Body silvery plan (Ref. 43281).

Occur in rapids and in slow flowing water (Ref. 37771). It may be the single most abundant species in the Mekong basin and is certainly an ecological keystone species. Collected in numerous tributaries as small as 2-3 m wide in widely separated localities in Thailand, Laos and Cambodia. In terms of absolute numbers, it is the most abundant fish species in the major migrations that occur in the mainstream of the Mekong River below Khone Falls every December-February and May-July, where there is an important artisanal fisheries. Probably the single most important forage or prey species for many piscivore fish species present there, and may also be heavily preyed upon by the local dolphin, Orcaella brevirostris . Is one of the lead species in the massive migrations of cyprinid fishes moving up the Mekong mainstream in the Khone Falls area. Most of these falls represent an impassable physical obstacle to the migrators, but they can be avoided by going up one or two of the large "hoo" or channels (most importantly Hoo Sahong) and smaller pathways, thus by-passing the impassable falls and more difficult rapids. Employs a strategy, "the ever-changing leadership strategy for finding the pathway of least resistance", which can only be successful when very large numbers of individuals are migrating. As the migrating fish move upstream, the leading fish are blocked or fail to find a way onwards, some fish turn back and look for other routes. Therefore the leadership of the migrators is constantly changing, until some leaders are successful in getting past obstacles and take large numbers of followers with them.


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

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More information
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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low to moderate vulnerability (31 of 100)	Not marketed/unknown

Entered by Casal, Christine Marie V.

Modified by Torres, Armi G.

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Page last modified by : elaxamana, 15 July 2009

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