Figure 5.

Attachment ability of E. assimilis larvae on substrates with different surface roughness. The same experiment was performed for the same substrates with and without biofilm. The maximal flow velocity at which the larvae remained on each substrate was determined. In the presence of the biofilm, more larvae stayed on substrates S1–S3 at higher flow velocities. Almost all larvae were able to withstand the maximum flow velocity with and without biofilm on the substrate S4. S1–S4, substrates of the types 1–4, respectively.