▁the ▁Cy pr in odon ▁species ▁in ▁Lake ▁Ch ich an can ab ▁have ▁diver ged ▁into ▁different ▁nich es . ▁P up fish ▁typically ▁feed ▁on ▁alg ae ▁and ▁det rit us . ▁In ▁Lake ▁Ch ich an can ab , ▁however , ▁C . ▁sim us ▁has ▁become ▁a ▁zo op l ank ton - fe eder . ▁It ▁once ▁occurred ▁in ▁large ▁schools , ▁but ▁has ▁decl ined ▁dr ast ically ▁due ▁primarily ▁to ▁introduced ▁species ▁( N ile ▁til ap ia ▁and ▁the ▁t etra ▁Ast yan ax ▁fas ci atus ). ▁Among ▁the ▁en demic ▁Cy pr in odon ▁species ▁in ▁Lake ▁Ch ich an can ab , ▁only ▁C . ▁bel tr ani ▁and ▁C . ▁lab ios us ▁still ▁occur ▁in ▁some ▁numbers ▁in ▁their ▁habitat , ▁while ▁the ▁remaining ▁are ▁virt ually — if ▁not ▁fully — ext inct ▁in ▁the ▁wild ▁( at ▁least ▁some ▁of ▁these , ▁including ▁C . ▁sim us , ▁still ▁surv ive ▁in ▁capt ivity ). ▁However , ▁a ▁spec imen ▁of ▁C . ▁sim us ▁was ▁recorded ▁in ▁the ▁wild ▁in ▁ 2 0 0 9 . ▁ ▁References ▁ ▁box ead or ▁Category : End em ic ▁fa una ▁of ▁Mexico ▁Category : F resh water ▁fish ▁of ▁Mexico ▁Category : F ish ▁described ▁in ▁ 1 9 8 1 ▁Category : T ax onomy ▁articles ▁created ▁by ▁Pol bot <0x0A> </s> ▁E lo ph ila ▁ro set ta ▁is ▁a ▁moth ▁in ▁the ▁family ▁Cr amb