Southwest Atlantic: southern Brazil (estuary of the Lagoa dos Patos) and Uruguay to at least BahÃa Blanca, Argentina; some of the more southerly records (even to the Beagle Channel) must refer to Sprattus fuegensis
Definition: length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate. Simply put, this measurement excludes the length of the caudal fin