| Summary: | For marine aquaculture it is suggested that a specific substrate coated with a beneficial biofilm could prevent fish egg clutches from pathogenic infestations and improve the water quality and health of adult fish while, at the same time, minimising the need for the application of antibiotics. In marine biotopes, the habitat of <em>Pseudoalteromonas</em> species (a strain with suggested beneficial properties), biofilms are mostly discussed in the context of fouling processes. Hence research focuses on unravelling the mechanisms of biofilm formation aiming to prevent formation or to destroy existing biofilms. Initially in this review, particular components of biofilm formation in <em>Pseudomonas aeruginosa</em>, a gram-negative model organism that is responsible for nosocomial infections and considered as a food spoiling agent, are described (extracellular appendages, role of matrix components, cell-cell signalling) to get an advanced understanding of biofilm formation. The aim of this treatise is to seek linking points for biofilm formation of <em>P. aeruginosa</em> and <em>Pseudoalteromonas</em> sp., respectively. Furthermore, approaches are discussed for how biofilm formation can be realized to improve fish (larvae) rearing by species of the genus <em>Pseudoalteromonas</em>.
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