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BIOFILM

Definition

A thin carpet mostly of bacteria (single or multilayered) or general "Aufwuchs" on substrate surfaces submerged in water. In modern aquaculture, the microbial and invertebrate mats settling on biofilter material, in which all degradation processes of organic substances and nutrients take place. These organisms work best at an optimal film thickness and their efficiency is also related to the hydrodynamics (e.g. exchange rate of water-substrate interface). Excessive growth of fungi and ciliates can cause problems on biofilms in biofilters. The role of fish/shellfish pathogens in biofilms and their effect on aquaculture system performance (using recirculation technology) is as yet largely unknown.

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