Comparison of growth and condition of European eels stocked as glass and farm sourced eels in lakes in the first 4years after stocking

European glass eels Anguilla anguilla showed a better overall performance of growth and condition compared to farm sourced eels after stocking in six isolated lakes within a 4-year study period. It can be concluded that the stocked farm sourced eels needed a longer period to switch from artificial food to natural prey and to adapt to new foraging strategies.