The spread of the non-indigenous mussel species Mytella strigata (Hanley, 1843) in the Philippines: Ensuing issues and responses of local communities

This study investigated the distribution and utilization of Mytella strigata in the Philippines thru site surveys, focus group discussions, and interviews. Initially reported in Manila Bay in 2014, results showed that this mussel species had spread to provinces mainly in the western and northern sections of Luzon Island. Interviews and focus groups revealed that Asian green mussel and oyster farming were affected by the non-indigenous species resulting in a reduction in harvest of farmed shellfish. As a result, local communities in traditional shellfish farming sites generally expressed negative perception towards the non-indigenous species as this was not regarded as a food item. In contrast, local fishers in non-traditional shellfish farming sites generally welcomed M. strigata as it provided food and livelihood opportunities. These results show that the emergence of M. strigata in the Philippines had both positive and negative consequences on the livelihoods of affected local communities. However, local and national agencies had been slow in recognizing the threat of M. strigata on Asian green mussel and oyster industries. These results, therefore, provide useful information to address issues related to the non-indigenous mytilid species and signify the need to review local and national policies in response to the emergence of potentially invasive species. (c) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study investigated the distribution and utilization of Mytella strigata in the Philippines, showing both positive and negative impacts on local communities. Traditional shellfish farming sites expressed negative perception towards the non-indigenous species, while local fishers in non-traditional shellfish farming sites generally welcomed the Asian green mussel.