ment ed ▁red ▁chrom at op hor es ▁in ▁the ▁car ap ace ▁and ▁tel son . ▁The ▁intensity ▁of ▁colour ation , ▁believed ▁to ▁be ▁associated ▁with ▁the ▁species ' ▁cre pus cular ▁behaviour , ▁var ies ▁with ▁contra ction ▁or ▁expansion ▁of ▁the ▁chrom at op hor es ▁in ▁response ▁to ▁light ▁and ▁temperature ▁conditions ; ▁in ▁sh aded ▁areas , ▁individuals ▁tend ▁to ▁have ▁a ▁deeper ▁red ▁colour . ▁Ju ven iles ▁are ▁more ▁transl uc ent ▁than ▁adult s . ▁Pres erved ▁individuals ▁lose ▁their ▁colour , ▁becoming ▁op aque . ▁H . ▁anom ala ▁is ▁distinguish able ▁from ▁other ▁my s id ▁species ▁including ▁the ▁Great ▁L akes ' ▁native ▁op os sum ▁sh rim p ▁M ysis ▁dil uv iana ▁by ▁its ▁trunc ated ▁tel son ▁with ▁a ▁long ▁sp ine ▁at ▁both ▁corners ; ▁by ▁contrast , ▁M . ▁dil uv iana ▁has ▁a ▁for ked ▁tel son . ▁ ▁Hab itat ▁The ▁blo ody - red ▁my s id ▁fav ours ▁hard ▁bottom ▁surfaces , ▁including ▁rocks ▁and ▁shell s ▁and ▁avoid s ▁soft ▁bottom s ▁and ▁areas ▁of ▁dense ▁veget ation ▁or ▁high ▁s ilt ation . ▁In ▁its ▁native ▁range , ▁the ▁species ▁is ▁found ▁in ▁water ▁depth s ▁r anging ▁from ▁, ▁although ▁they ▁generally ▁inhab it ▁depth s ▁of ▁. ▁The ▁species ▁is ▁normally ▁found ▁in ▁l entic ▁waters , ▁although ▁it ▁has ▁successfully ▁established ▁in ▁European ▁rivers ; ▁it ▁has ▁also ▁been ▁found ▁along ▁rock y , ▁wave - ex