 Scientists argued that further introduction should wait until research showed the effect of the introduction in Kyoga, but by the late 1950s, Nile perch began being caught in Lake Victoria.As the species was already present, there were few objections when more Nile perch were transferred to Victoria to further bolster the stock in 1962–63.The origin of the first Victoria introductions in the 1950s is not entirely clear and indisputable evidence is lacking.