▁considered ▁an ▁important ▁food ▁fish ▁where ▁it ▁occurs , ▁reaching ▁up ▁to ▁ ▁in ▁total ▁length ▁and ▁ ▁in ▁weight . ▁ ▁This ▁fish ▁spawn s ▁in ▁the ▁summer , ▁mainly ▁in ▁streams ▁in ▁places ▁like ▁the ▁mid - Am ur , ▁Song h ua ▁and ▁U ss uri ▁bas ins . ▁In ▁the ▁Am ur , ▁young ▁are ▁found ▁in ▁the ▁lower ▁sections . ▁They ▁m ature ▁after ▁ 6 ▁years , ▁and ▁after ▁this ▁time ▁they ▁tend ▁to ▁live ▁in ▁flo od pla ins ▁and ▁winter ▁in ▁the ▁main ▁rivers . ▁They ▁mainly ▁consume ▁smaller ▁fish . ▁ ▁From ▁the ▁ 1 9 7 0 s ▁to ▁ 1 9 9 0 s , ▁the ▁population ▁of ▁yellow che eks ▁dr ast ically ▁decre ased , ▁but ▁in ▁the ▁ 2 0 1 0 s ▁the ▁population ▁has ▁been ▁observed ▁to ▁increase . ▁The ▁species ▁appears ▁to ▁have ▁disappeared ▁entirely ▁from ▁the ▁Y ellow ▁River ▁bas in . ▁Major ▁thre ats ▁are ▁dam ▁construction , ▁poll ution , ▁and ▁over f ishing . ▁However , ▁little ▁is ▁known ▁about ▁the ▁overall ▁tr ends ▁of ▁this ▁species . ▁As ▁of ▁ 2 0 1 2 ▁there ▁were ▁no ▁conservation ▁measures ▁in ▁place , ▁and ▁it ▁is ▁unknown ▁if ▁such ▁measures ▁are ▁necessary . ▁ ▁References ▁ ▁Category : Cy pr in id ▁fish ▁of ▁Asia ▁Category : F ish ▁described ▁in ▁ 1 8 4 5 ▁Category : F resh water ▁Game ▁fish <0x0A> </s> ▁The ▁T aur us ▁was ▁a ▁British