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From 2011 to 2013, anadromous brown trout Salmo trutta (213−730 mm, total bodylength, LT) were collected during or shortly after their marine feeding migration at 7 differentlocalities in central Norway. The mean volume of stomach content (%) of marine fish prey eatenby S. trutta captured in marine waters varied from 34 to 89%. There was a high prevalence(67−100%) for parasite groups potentially transmitted by marine prey fish (i.e. nematodes, cestodesand trematodes) at all sampling sites. There was a significant overlap in the signatures ofboth δ13C and δ15N in the muscle tissue between the 7 groups of S. trutta; however, individual variationwithin groups was large. A strong positive relationship between δ13C and LT indicated sizedependentniche selection, with smaller individuals feeding less on marine prey and more onbrackish or freshwater invertebrates in the estuary. Short-term gut contents data and trophicallytransmitted parasites showed that all size groups were feeding on marine fish. However, anincreased dependence upon marine prey fish by larger S. trutta was indicated by a strong positiverelationship between LT and δ15N. Similarities in S. trutta feeding and time-integrated trophictracers (stable isotopes and parasites) across the 7 localities supports the general view that S. truttafeed within similar marine trophic niches. This similarity in feeding niche requirements may makeS. trutta populations vulnerable to anthropogenic ecosystem perturbations which reduce thediversity of potential marine prey items

Trophic niche similarity among sea trout Salmo trutta in central Norway investigated using different time-integrated trophic tracers