The only known metals to biomagnify
in aquatic organism are methylmercury and possibly selenium (PARAMETRIX, 1995 apud ICMM, 2007).
Therefore, copper does not bioaccumulate or biomagnify
in aquatic or terrestrial food chains.
These compounds have great affinity for fatty molecules what makes it easier to be accumulated in the fat tissue of organisms; as a consequence they can be biomagnify
along the food chain, where its degradation products are more toxic or permanent than the original compound (Henao et al.
Many contaminants biomagnify
up food webs to reach significant concentrations in top predator species.
Any form of Hg can be converted to methylmercury by natural means and then bioaccumulate and biomagnify
as it progresses through aquatic food webs.
PCBs are particularly problematic because they bioaccumulate and biomagnify
in aquatic food chains and hence attain peak concentrations in lipid-rich predatory organisms occupying upper trophic levels.
Although the effects of PBDEs and PBBs (polybrominated biphenyls--another related flame retardant) in humans are largely unknown, their similarity to PCBs, a known toxin, and their capacity to bioaccumulate in fatty tissue and then biomagnify
up the food chain, are a cause for concern for scientists and regulators.
These compounds tend to bioaccumulate  and biomagnify
 in food webs and their toxicology is a critical environmental [6, 7] and human health issue [8-10].
POPs can dissolve in fat and thus bioaccumulate and biomagnify
(increasing in concentration up the food chain).
Such substances are toxic--they can be poisonous, infectious, or corrosive--are often persistent, and as a result have the ability to bioaccumulate (build up in fatty tissues in individual organisms) and concentrate further or biomagnify
up food chains.
Synthetic organic chemicals such as chlorinated hydrocarbons are conservative pollutants that sometimes biomagnify
and cause damage to higher organisms.
Nonessential elements are not usually regulated metabolically and may bioaccumulate and/or biomagnify