摘要：Summary. - Persistent organic pollutants (POP) are a heterogeneous group of chemicals widely distributed
in the aquatic environment. Some classes cause adverse effects in the biota at minute concentrations, persist in
the environment for a long time, and bioaccumulate in animal tissues. Several strategies exist today to monitor
their levels and evaluate their effects in the environment. Particularly, some interesting approaches have recently
been developed in the field of biomarkers, although much work seems to be required to study the relationships
between toxic responses at different levels of the biological organization of interest and concentration levels in
tissues.
