In South America and Asia, rainbow trout are farmed with a high FFDRFFDR:
The Forage Fish Dependency Ratio (FFDR) quantifies the environmental impact of aquaculture feed based on the inclusion level of forage fish marine ingredients. , indicating that the feed contains a lot of fish mealfish meal:
Fishmeal is, together with fishoil, a very important ingredient used in fishfeed for aquaculture production. Fishmeal is derived from wild-caught fish which are often not caught sustainably. and fish oilfish oil:
Fishoil is, together with fishmeal, a very important ingredient used in fishfeed for aquaculture production. Fishoil is derived from wild-caught fish which are often not caught sustainably. derived from wild fish. The major feed producers do not have documentation and traceability.
Rainbow trout can be farmed in cagesCages:
A cultivation technique with open cages in the sea, lake or river. They are anchored to the bottom and are standing in places sheltered for storm and high waves. Most salmon is grown in this type of culture system. Because the cages are in open connection with the surrounding water, the impact on the environment is high., racewaysRaceways:
A culture technique in which water is led from a higher point to a culture basin. From here it flows through to the drain. This water must be properly purified or it may have negative effects on the environment. and pondsPonds:
A cultivation technique whereby fish is cultivated in ponds. This happens extensively (without additional feed) and intensive (with additional feed supplements). . These methods of farming can have major impacts on the ecosystem, through, for example, residual and waste products being released directly into the environment, escapesEscapes:
It may happen that farmed animals escape during the farming process, for example when farming at sea or in rivers. This can lead to genetic mixing between the farmed animals and wild populations and can have negative effects on the growth and fertility of wild animals. or disease spread to wild populations.
The legal framework for aquaculture in South America and Asia is not sufficient to address most social and environmental issues. ManagementManagement:
The regulations surrounding fisheries and aquaculture that ensure that production is carried out within legal frameworks and that sustainability can be assured. of this species is not effective.