Science for Glass Eel Fisheries Management: How to Define TAC in France?
A scientific experts panel has been constituted to estimate TAC given the management target and the expected recruitment level. We describe methods used (i) to estimate mean exploitation rate during reference period using catch and recruitment series and (ii) to predict future recruitment level. A Bayesian model has been designed to cope with the variability in past exploitation rate due to environmental and economic conditions and with the uncertainty in recruitment prediction, particularly the possibility of alternative future (unchanged decreasing trend or regime shift and possibly increasing trend). The TAC really adopted and the actual recruitment and exploitation rate level are compared to the prediction made. We finally discuss the role of scientists, managers and fishers and the importance of exchanges between them in this management process.