1 9 5 0 s ▁and ▁ 1 9 6 0 s ▁to ▁serve ▁as ▁fish ▁food . ▁Despite ▁its ▁spread ▁throughout ▁Europe , ▁it ▁is ▁considered ▁to ▁be ▁end anger ed ▁in ▁some ▁parts ▁of ▁its ▁ind igen ous ▁range ▁( U k raine ). ▁ ▁The ▁species ▁has ▁entered ▁the ▁Great ▁L akes ▁via ▁the ▁ball ast ▁water ▁exchange ; ▁it ▁was ▁reported ▁for ▁the ▁first ▁time ▁in ▁ 2 0 0 6 ▁from ▁two ▁dis j unct ▁regions : ▁sout he astern ▁Lake ▁Ontario ▁at ▁N ine ▁M ile ▁Point ▁near ▁O sw ego , ▁New ▁York ▁in ▁May ▁ 2 0 0 6 , ▁and ▁from ▁a ▁channel ▁connecting ▁Mus k eg on ▁Lake ▁to ▁Lake ▁Michigan ▁in ▁November ▁ 2 0 0 6 . ▁Spec im ens ▁res emb ling ▁H . ▁anom ala ▁have ▁also ▁been ▁found ▁in ▁the ▁st om ach ▁contents ▁of ▁a ▁white ▁per ch ▁collected ▁near ▁Port ▁D over , ▁Lake ▁Er ie ▁in ▁August ▁ 2 0 0 6 . ▁The ▁species ▁was ▁discovered ▁in ▁the ▁Saint ▁Lawrence ▁River ▁in ▁July ▁ 2 0 0 8 ; ▁it ▁is ▁now ▁found ▁in ▁all ▁the ▁major ▁Great ▁L akes ▁water b od ies , ▁except ▁for ▁Lake ▁Super ior . ▁ ▁An atom y ▁and ▁morph ology ▁ ▁M ature ▁individuals ▁reach ▁ ▁in ▁length ; ▁females ▁are ▁slightly ▁larger ▁than ▁males . ▁The ▁species ▁can ▁be ▁iv ory - yellow ▁in ▁colour ▁or ▁transl uc ent , ▁but ▁exhib its ▁p ig