Influence of terrestrial lipid and protein sources and activated carbon-treated fish oil on levels of persistent organic pollutants and fatty acids in the flesh of Atlantic salmon

摘要

Reductions in flesh contaminant concentrations were evaluated in a 36-week feeding trial examining several dietary techniques. Atlantic salmon were fed one of seven dietary treatments for 24weeks. These diets included a fishmeal, fish oil control diet, an industry control diet, three diets that examined a 75% replacement level of anchovy oil (AO) with flaxseed oil, canola oil and poultry fat, and two diets formulated to be low in contaminants formulated with canola oil, activated carbon-treated anchovy oil and canola protein concentrate or soy protein concentrate. Following this initial 24-week feeding interval, a 12-week finishing diet was utilized to restore the levels of omega-3 highly unsaturated fatty acids (n-3 HUFAs). The salmon had marked reductions in their flesh concentrations of total polychlorinated biphenyls (PCBs), dioxin-like PCBs and total toxic equivalents by the end of the grow-out phase, but also exhibited significant depressions in their flesh concentrations of n-3 HUFAs relative to 100AO-fed fish. The 12-week finishing diet period was effective in partially re-instating omega-3 levels to those present in the flesh lipids of fish fed 100AO while concurrently maintaining lower flesh contaminant concentrations.