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We present an analysis of the long-term stability of fibre-optic transmissionproperties for fibre optics in astronomy. Data from six years of operation ofthe AAOmega multi-object spectrograph at the Anglo-Australian Telescope ispresented. We find no evidence for significant degradation in the bulktransmission properties of the 38 m optical fibre train. Significant losses(<20% relative, 4% absolute) are identified and associated with the endtermination of the optical fibres in the focal plane. Improved monitoring andmaintenance can rectify the majority of this performance degradation.

Long-term stability of fibre-optic transmission for multi-object spectroscopy