mention two environmental concerns due to the use of aquafeeds.
Answers
Aquaculture feeds and feeding regimes can play a major role in determining the quality and potential environmental impact or not of finfish and crustacean farm effluents. This is particularly true for those intensive farming operations employing open aquaculture production systems, the latter including net cages/pen enclosures placed in rivers, estuaries or open-water bodies, and land-based through-flow tank, raceway or pond production systems. This is perhaps not surprising since the bulk of the dissolved and/or suspended inorganic and/or organic matter contained within the effluents of intensively managed open aquaculture production systems are derived from feed inputs, either directly in the form of the end-products of feed digestion and metabolism or from uneaten/wasted feed, or indirectly through eutrophication and increased natural productivity.