Several species of jacks are found in the Mediterranean like the yellowtail amberjack distinguished from the yellow tips on their own tails plus the increased amberjack- using a horizontal line from nose to their dorsal fin. These fish are likely to migrate from the late spring so as to reproduce. https://aquarium-conservation-eff07418.nizarblog.com/33382180/the-fact-about-mediterranean-marine-life-that-no-one-is-suggesting