Performance of Pseudomonas CFC-selective medium in the fish storage ecosystems

Pseudomonas agar base supplemented with cephaloridine, fucidin, and cetrimi de (CFC) was used to count Pseudomonas populations on fish. Both Enterobact eriaceae and Shewanella putrefaciens were able to grow on the CFC medium. E valuation of the performance of CK-selective for pseudomonads medium, on fi sh samples stored aerobically and under a modified atmosphere at 0, 10 and 20 degreesC was tested. The selectivity of the medium was affected by storage temperatures and the type of packaging of the fish samples. The selectivity of the medium dimini shed as the population increased and for samples stored at high temperature (20 degreesC) or under modified atmospheres. When designing adequate selectivity of a medium, interfering organisms shou ld be taken into account, especially when the background flora tends to be more robust than the organisms to be counted or detected. (C) 2001 Elsevier Science BN. All rights reserved.