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Barbus andrewi
''Barbus andrewi'', the Cape whitefish or Berg-breede River whitefish, 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. Actually, though, 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 sawfin (''B. serra'').〔de Graaf ''et al.'' (2007)〕
==Distribution and ecology==
It is endemic to the Western Cape Province of South Africa, where it occurs in the Breede River's Brandvlei Dam and Sanddrift Dam, as well as the Hex River. Formerly, it was also found in and around the Berg River, but it seems to have disappeared from there. Populations have also been transplanted to farm water catchments, but it is not well known if these have thrived or failed.〔Impson & Swartz (2007)〕
It inhabits the deeper stretches of rivers with rocky shores or riparian trees. While young fish are common in riffles, adults are not rheophilic and will thrive in slow-moving water. Young fish are carnivores, eating zooplankton and small aquatic invertebrates. Adults have more omnivorous diets that consist of benthic invertebrates and algae. The breeding season is in late spring (about October) when the water has warmed to above . Schools of adults form to migrate to riffles with over one meter/yard deep water and spawn in the late hours of morning. A good-sized adult female produces about 100,000 eggs. In dams, it will use rocky and gravelly substrate in the shallows as a spawning place. The species is long-lived.〔
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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