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Twee River Redfin
The Twee River Redfin (''Barbus erubescens'') or simply Twee Redfin is a ray-finned fish species in the family Cyprinidae. It is placed in the "wastebin genus" ''Barbus'' – the typical barbels and relatives – by default. But actually it is far less closely related to the typical barbels than to the South African redfins in ''Pseudobarbus'', and may well belong in the latter genus. Like ''Pseudobarbus'' but unlike most other African "barbs", it is tetraploid. Its closest living relative is probably the Clanwilliam Redfin (''B. calidus'').〔de Graaf ''et al.'' (2007)〕
It is a smallish fish, just about long at sexual maturity and twice as long when fully grown. In the breeding season, males and females have the namesake red fins, but males (which are on average a bit larger) also have nuptial tubercles as typical for cyprinids.〔Impson & Swartz (2007)〕
==Distribution and ecology==
It is endemic to the Western Cape Province of South Africa, where it occurs in the Twee River to just before its confluence with the Leeu River, and some tributaries of the former – namely the Heks, upper Middeldeur and upper Suurvlei Rivers. Some have been introduced to dams of farms, but this was too recently to determine whether they thrive or fail in this habitat.〔
Adults inhabit the deeper pools in rivers, sheltered by boulders or riparian trees. Young fish gather in schools near the water surface, associating with overhanging riparian growth, in particular Palmiet (''Prionium serratum'', a Thurniaceae). The food is mainly benthic invertebrates; adults are also known to take other edible matter that drifts by, such as terrestrial insects that have fallen on the water surface. The breeding season extends from late spring to early summer (October to December). Eggs – up to 400 per female and breeding season – develop iteroparously, and spawning occurs after a batch of eggs has become fully developed; it is thus repeated several times during a breeding season until the entire batch of eggs has been laid. Sexual maturity is reached at two years of age, and the species can get up to 6 years old.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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