Siavonga District Commissioner Emily Striedl confirmed to ZANIS that the duo met their fate when the canoe they were paddling capsized due to a heavy downpour.
Ms. Striedl explained that they were four people in the canoe but the other two managed to swim to safety.
She said marine police have since launched a search in a bid to retrieve the bodies of the duo.
Siavonga residents have expressed concern and worry over the number of fishermen that have continued to die on Lake Kariba.
The residents, who spoke on condition of anonymity, said there is need for companies that employ the fishermen to put in place safety measures that will safeguard the lives of their employees.
The residents wondered whether the employers were providing their employees with lifejackets in a bid to improve their chances of survival when they faced turbulences on the lake.
A fortnight ago four fishermen drowned on Lake Kariba and three of the bodies have not yet been retrieved from the lake.