. C. quadricarinatus was introduced several years ago to Argentina,
although the subtropical to temperate climate of this country is
marginal for its culture. This species can survive at a winter temperature
as low as 10 °C, but growth at this temperature is practically
arrested (Karplus et al., 1998). This is a serious problem in temperate
countries, mainly during grow-out of juveniles in external ponds. In
farms, juveniles achieving a body weight around 1 g are suitable for
being grown-out, but at this size a reduced growth occurs at 20 °C
(Jones, 1997).