This Criminal Minds fan art contains
pacific sardine and sardinops caerulea.
There might also be
atlantic herring, clupea harengus harengus, herring, clupea harangus, and smelt.
The BAU realizes that a well-trained European unit is responsible for the killings and that at least one of them has a very personal motive.
CBS on YouTube. Clips from 6x17 Valhalla.