Bycatch is typically managed in cold-water shrimp trawling, and rates of bycatch are accordingly low, and the capture of sea turtles is rare in cold temperate waters. Bycatch is mostly reduced by the use of Nordmøre grids, which reduce the numbers of cod, haddock, Greenland halibut and redfish caught during shrimp trawls. The Nordmøre grid was invented by the Norwegian fisherman Paul Brattøy, primarily as a means of excluding jellyfish from shrimp catches, and introduced in 1989. This innovation causes a minimal reduction in the quantity of shrimp caught, but can reduce the amounts of bycatch by around 97%.