21 3 acidpollutionofrivers bayof(franceandspain) bayofbiscay biscay browntrout conservation counting croissance dataprocessing ecology endangeredspecies estimates etc fische fishculture fisheries fisherymanagement fisheryresources fishes fishesgrowth fishing fishstockassessment freshwaterfishes gametheory geographicaldistribution gold-eye growth handbooks history lakes manuals marineecology marinefishes mathematicalmodels methodology migration ökologie poissons populationdynamics populations populationsdynamik rarefishes research salmonidae spain tropics wi1827 wi2133 wildlifeconservation ökologie