Last season's Adelaide premiership-winning trainers Will Clarken and Niki O'Shea will go their separate ways, ending their two-and-a-half year partnership.
Clarken informed his owners on Wednesday that the move was simply an economic decision with the stable unable to support two head trainers.
He wrote that to be financially viable the stable needed at least 60 horses in training, but between Morphettville and Clarken's private farm Sellicks Hill, he could accommodate a maximum of 45 horses.
"Going into our partnership, Niki and I made a pact that despite the outcome or length of the partnership, we would walk away as friends no matter what and we have achieved this," Clarken said.
"Sadly, circumstances beyond our control undermined the sustainability of the business model we based our partnership on.
"To keep the business commercially viable as a dual-training partnership we need to have 60-plus horses in full training.
"Although we have the horse numbers at present, there isn't a viable option in South Australia to accommodate that number of horses."
O'Shea, who is currently in Ireland, will train on his own when he returns from his overseas trip.
The pair won last season's South Australian metropolitan trainers' premiership with 45 winners and 64 statewide, but they have slipped to equal fourth with 26 city winners and $1.781 million in prize money this season.