Observations on fish growth in polyculture during late summer and autumn in fish ponds at the Umtata Dam Fish Research Centre, Transkei Part I: The use of pig manure with and without pelleted fish feed Observations on fish growth in polyculture during late summer and autumn in fish ponds at the Umtata Dam Fish Research Centre, Transkei Part I: The use of pig manure with and without pelleted fish feed Posted in .