Triton, the European private equity firm, and Axa Private Equity, the French buyout group, are selling Tetra Goup, a Germany-based, fish food maker acquired two years ago.

AXA Private Equity acquired a 22% stake in Tetra from Triton in April 2003 at a price which valued the business at $238.5m (€181m). The purchase took place four months after Triton's initial acquisition.