Physical 

The blue runner fish is olive to blue-green on top, with a silver-grey or golden belly. They also have a black spot on the gill cover and black tail tips. Scutes (bone-like spikes) are present on the sides and in front of the tail. On average, adults grow to 12 in (30 cm), with the largest individuals growing to 20 in (50.8 cm).

Habitat

Their range spans from Nova Scotia to Brazil, including the Bahamas, Gulf of Mexico, and the Caribbean. They also live in the western Mediterranean and parts of Europe and Africa. Juveniles prefer vegetated areas in lagoons and estuaries, especially areas with Sargassum seaweed. Adults school together inshore and near the coastline. They also like to gather around oil rigs.

Feeding 

Blue runners eat fish, shrimp, and squid. They’re commercially fished and used as bait for large predatory fish.