Bar Jack: Photo by Michael McDonough on Flickr.
The Bar Jack is an elegant fish in the Jack (Carangidae) family resident to the Gulf of Mexico and Caribbean, extending along the coast of Brazil associated with coral reefs. Most often schooling and feeding pelagically, but occasionally foraging solo in shallow sand.
Their sound is produced by way of both grinding teeth and swim bladder oscillation.
Most accounts of the Bar Jack include a hetrospecific foraging relationship with the Puddingwife Wrasse – that the wrasse and the jack formed foraging teams that the Jack would even defend this team relationship against encroachment by conspecifics (other Bar Jacks).
electric blue stripe below the black stripe on the body
body color gets darker when bottom-feeding
mobile between various different habitats
Fish, M.P. and Mowbray, H.M. 1970. Sounds of Western North Atlantic Fishes. Baltimore, MD: The Johns Hopkins Press. p. 62Hoese, H.D. and Moore, R.H. 1998. Fishes of the Gulf of Mexico: Texas, Louisiana, and Adjacent Waters. Texas A&M University Press, College Station, Texas 77843