copenhagen danish fishermen could hit hard britain decision leave european union lead restrictions access british water research report make request danish government conclude wednesday danish fish lobby strong clout copenhagen could press government adopt tough stance britain negotiations eu post-brexit trade deal european fishermen want brussels use trump card continue access essential eu market negotiations divvy seas danish fishermen operate british water could lose half current catch bad four imagine scenarios researchers copenhagen university conclude report actual consequences depend negotiations britain 27 eu countries minister fisheries karen ellemann say work affect countries maintain fish opportunities access british water say comment report years 2012 2016 danish fishermen unload fish british water worth 700 million billion danish crown 109-156 million correspond 34 percent total value fish upload danish fishermen 45 percent volume herring mackerel would especially hit would indirectly hurt denmark onshore fish process industry danish vessels might change behavior way foresee analysis fish opportunities might become possible instance norwegian zone researchers say report danish fishermen argue british get free access sell fish eu eu fishermen also get free access fish british fish zone europe import 75 percent british catch britain say plan allow foreign ship fish uk water brexit claim right decide extent access eu seek maintain something close status quo industry source tell reuters danish fishermen could hit hard brexit research report