Abstract
Single-species groups of fry of the planktivorous, filter-feeding carps (silver carp Hypophthalmichthys molitrix, bighead carp Aristichthys nobilis, rohu Labeo rohita and catla Catla catla) were exposed to the bacterium Chromobacterium violaceum to assess if they could detect or ingest unattached bacteria. The results indicate that planktivorous carp fry are able to ingest unattached bacteria and that the numbers ingested increase with time and with bacterial concentration in the media, although probably by passive means. It is also suggested that unattached bacteria are of little nutritional significance to carps.
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