Abstract
Tilapia ( Oreochromis niloticus) fry were exposed to concentrations of the bacterium Chromobacterium violaceum in order to establish whether they can detect and ingest unattached bacteria. Groups of fish exposed to both bacteria and to cell-free bacterial extracts showed a significant increase in opercular beat rates, thus demonstrating that they are able to detect the presence of unattached bacteria in suspension. Examination of the stomach contents showed that bacteria were ingested and that there was a significant, positive correlation between ingestion and concentration in the trial media.
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