we ed ▁( L itt or ella ▁un if l ora ) ▁may ▁be ▁found ▁growing . ▁They ▁are ▁dependent ▁on ▁this ▁constant ▁fl uct u ation ▁of ▁water ▁levels ▁in ▁the ▁res er voir ▁and ▁so ▁the ▁nature ▁conservation ▁authorities ▁have ▁agreed ▁with ▁the ▁p ond ▁operators ▁an ▁operating ▁regime ▁that ▁will ▁secure ▁the ▁existence ▁of ▁these ▁plants ▁in ▁the ▁water b od ies ▁concerned . ▁By ▁other ▁p onds ▁there ▁are ▁me adow ▁b ogs ▁( K lein se gg en ried ), ▁which ▁are ▁rich ▁in ▁sed ges , ▁r ush es ▁and ▁c ott ong rass ▁and ▁m oss ▁communities . ▁ ▁The ▁fish ▁population ▁is ▁primarily ▁influenced ▁by ▁the ▁ang ling ▁clubs ▁that ▁le ase ▁fish ing ▁rights ▁and ▁stock ▁the ▁p onds ▁with ▁fish . ▁Only ▁native ▁species ▁of ▁fish ▁are ▁desired , ▁although ▁e el ▁and ▁cat fish ▁are ▁ex cluded ▁due ▁to ▁their ▁in compat ibility ▁with ▁the ▁c ray fish ▁populations . ▁ ▁Table ▁of ▁Upper ▁Har z ▁P onds ▁▁ ▁The ▁following ▁list ▁includes ▁the ▁majority ▁of ▁the ▁dam med ▁p onds ▁built ▁by ▁the ▁Upper ▁Har z ▁min ers , ▁where ▁they ▁are ▁still ▁in ▁operation ▁or ▁where ▁the ▁dam ▁ru ins ▁are ▁still ▁clearly ▁visible . ▁Mill ▁p onds ▁are ▁not ▁included . ▁A ▁total ▁of ▁ 1 4 3 ▁d ams ▁and ▁former ▁d ams ▁have ▁been ▁documented . ▁ ▁(† ) ▁means : ▁p ond ▁out ▁of ▁service , ▁largely ▁dry . ▁Dam ▁remains ▁exist . ▁ ▁Where ▁no