An assemblage of 538 lead fishing weights and associated fragments recovered from excavations carried out at Holme Fen Site 2 in Cambridgeshire was subjected to investigative conservation. Thirty-nine of the weights were found to be much more extensively corroded than the rest and eleven of the weights retained traces of associated net fibres. Analytical work established that the differences in condition were not due to compositional factors and alternative causes are discussed. The net fibres present were identified as being of animal origin, possibly cattle.