The Triton Fund, a German buy-out firm, and Axa Private Equity, have sold their stakes in Tetra, a pet food and care retailer, to Rayovac, a US consumer brands group, in a deal valuing the firm at $551m (€415m).

Rayovac, based in Atlanta, recently announced it would change its name to Spectrum Brands, and becomes the world's largest manufacturer of pet supplies following the acquisition.