The importance of the fisheries sector and its links with agriculture® (cont.) Livestock and agriculture by-products, used traditionally to feed terrestrial animals, are now increasingly employed by the aquaculture sector, especially for the farming of non-camivorous aquatic species. Continued growth in demand for livestock and fish products, as well as for biofuels obtained from agriculture by-products, has raised concerns over the competition for feed supplies, in particular for the finite fishmeal and fish oil resources, and the impacts of such growth on the environment and on the aquaculture and livestock developments. When involving aquaculture, it is the concurrent or sequential linkage between two or more activities, of which at least one is aquaculture.