Periodically harvested closures require full protection of vulnerable species and longer closure periods
Résumé
Periodically harvested closures (PHCs) are small fisheries closures with objectives such as sustaining fisheries
and conserving biodiversity and have become one of the most common forms of nearshore marine management
in the Western Pacific. Although PHCs can provide both short-termconservation and fisheries benefits, their potential
as a long-term management strategy remains unclear. Through empirical assessment of a single harvest
event in each of five PHCs, we determined whether targeted fishes that differ in their vulnerability to fishing recovered
to pre-harvest conditions (the state prior to last harvest) and demonstrated post-harvest recovery benefits
after 1 year of re-closure. For low and moderately vulnerable species, two PHCs provided significant preharvest
benefits and one provided significant post-harvest recovery benefits, suggesting a contribution to longer-
term sustainability. PHCs with a combination of high compliance and longer closing times are more likely
to provide fisheries benefits and recover from harvest events, however, no benefits were observed across any
PHCs for highly vulnerable species. We recommend PHCs have longer closure periods before being harvested
and species that are highly vulnerable to fishing (e.g. large species of; grouper,wrasse and parrotfish) are avoided
during harvests to avoid overexploitation and increase the sustainability of small-scale fisheries.