By Maria Ward-Brennan Several UK supermarket giants have bound together to launch a competition claim against different fish farmers, accusing them of operating a cartel-like operation. Asda, Iceland, Marks and Spencer, Ocado, Morrison, International Seafoods, Aldi and the Co-Op have all brought a lawsuit to the Competition Appeal Tribunal (CAT). The claims are against fish farmers, Seashore, Cermaq, Grieg Seafood, Lerøy Seafood, SalMar, Mowi, Scottish Sea Farms and SSF Hjaltland. Several of these defendants are based in Norway. This claim is for damages arising from alleged “unlawful cartel a…