asing ▁water ▁quality , ▁the ▁loss ▁of ▁macro phy tes ▁( part ly ▁caused ▁by ▁the ▁introduced ▁grass ▁car p ), ▁over - f ishing , ▁and ▁the ▁loss ▁of ▁bre eding ▁sites ▁due ▁to ▁s ilt ation ▁and ▁blocked ▁access . ▁ ▁An ab ar il ius ▁pol yle pis ▁grows ▁to ▁ ▁standard ▁length . ▁It ▁lives ▁in ▁the ▁upp erm ost ▁ten ▁metres ▁of ▁the ▁water ▁column ▁and ▁fe eds ▁mainly ▁on ▁aqu atic ▁insect s , ▁pl ank ton , ▁and ▁plant ▁fragments . ▁ ▁References ▁ ▁Category : An ab ar il ius ▁Category : Cy pr in id ▁fish ▁of ▁Asia ▁Category : F resh water ▁fish ▁of ▁China ▁Category : End em ic ▁fa una ▁of ▁Y unn an ▁Category : F ish ▁described ▁in ▁ 1 9 0 4 ▁Category : T ax onomy ▁articles ▁created ▁by ▁Pol bot <0x0A> </s> ▁U sh akov ka ▁() ▁is ▁a ▁rural ▁local ity ▁( a ▁sel o ) ▁in ▁Ch erno yar sky ▁District , ▁A stra k han ▁O blast , ▁Russia . ▁The ▁population ▁was ▁ 1 , 5 6 5 ▁as ▁of ▁ 2 0 1 0 . ▁There ▁are ▁ 1 9 ▁streets . ▁ ▁References ▁▁ ▁Category : R ural ▁local ities ▁in ▁A stra k han ▁O blast ▁Category : R ural ▁local ities ▁in ▁Ch erno yar sky ▁District <0x0A> </s> ▁Peter ▁P appen heim ▁( born ▁ 1 9 ▁December ▁ 1 9 2 6 ) ▁is ▁a ▁Dutch