Angling competitions are a popular leisure activity in reservoirs of
Southern Portugal. These competitions can gather more than 100 anglers
aiming to catch the maximum fish weight. Groundbaiting and catch-andrelease
angling are two common practices for anglers in competition. In
this study, the loads of nutrients from commercial groundbait powders
used in angling competitions in the Maranhão reservoir and the possible
balance out of those nutrients through a moderate biomanipulation of the
fish biomass caught in competitions were analysed. In order to achieve
this aim, chemical analyses to groundbait powders most purchased by
Portuguese anglers and to fish species most captured in competitions
were made. Mass balances on inputs and outputs of nutrients considering
some biomanipulation scenarios were evaluated. Results demonstrated
that an effective management on angling competitions implementing a
moderate biomanipulation of fish in reservoirs could promote the control
of fish fauna and eutrophication, balancing out nutrients from anglinginfo:eu-repo/semantics/publishedVersio
