1. Wageningen University & Research, P.O. Box 338, 6700 AH Wageningen, the Netherlands.
2. Wageningen Eel Reproduction Experts B.V., Mennonietenweg 13, 6702 AB Wageningen, the Netherlands.
3. Palingkwekerij Koolen B.V., Hongarijesedijk 12, 5571 XC Bergeijk, the Netherlands.