Five stages of biofilm development. Stage 1, initial attachment; stage 2, irreversible attachment; stage 3, maturation I; stage 4, maturation II; stage 5, dispersion. Each stage of development in the diagram is paired with a photomicrograph of a developing P. aeruginosa biofilm. All photomicrographs are shown to same scale.

By Biofilm.jpg: D. Davisderivative work: 24Adrianus (Biofilm.jpg) [CC BY 2.5 (https://creativecommons.org/licenses/by/2.5) or CC BY 2.5 (https://creativecommons.org/licenses/by/2.5)], via Wikimedia Commons
https://upload.wikimedia.org/wikipedia/commons/1/1f/Biofilm_id.JPG