Aquaculture has a long tradition in Denmark. Today the most important farmed specie is trout (Oncorhynchus mykiss). The total production of trout is approximately 40 000 to 50 000 tons per year in fresh water and seawater in total. The eggs are taken from the parent fish in the hatchery in the period from October to April. The fry are after a few months, when their size is around 5-10 gr, transported to the smolt station with fresh good water supply and kept there for 12 to 18 months.
Normally, at the beginning of the spring, when the fish is naturally smoltified, the smolts are put to sea in net cages. The harvesting of the trout of 2-5 kg takes place in autumn and winter. After harvesting the trout is bled, gutted and packed fresh on ice or IQF-frozen within 5 to 10 hours.