A new report from NIVA Denmark, authored by Steen Knudsen, tested ten different filter types for their ability to capture environmental DNA (eDNA) from six marine species. The filters varied in both membrane material and pore size but were all examined using the same methodological approach.

Currently, the NOVANA monitoring programme uses Sterivex filters, which are enclosed in a protective plastic housing. This study also included filters without such encasement to evaluate potential alternatives.

Results indicate that, for cod, filters with a pore size of 3 µm may be more advantageous. However, no differences were found between Sterivex filters with pore sizes of 0.22 µm and 0.45 µm. Since only one species showed improved DNA retention with the larger pore size, the study cannot conclude that switching filter units would benefit eDNA monitoring in Danish waters.

👉 Read the full report here