A total of 158 rhino have been poached since the beginning of the year, the department of environmental affairs has said.
In the Kruger National Park (KNP), 116 rhino had been poached, the department said in a statement.
Thirteen were poached in North West, 12 in KwaZulu-Natal, nine in Mpumalanga and eight in Limpopo.
Sixty-one people had been arrested: 38 of them alleged poachers and three alleged couriers, the department said.
In the past week, two poachers were arrested in the KNP.
Nine people had also been arrested at a game farm near Lephalale, in Limpopo, in connection with a rhino-poaching incident on March 10.
More than 630 rhinos were killed by poachers in 2012.