Hemicaranx amblyrhynchus (bluntnose jack) is a tropical marine fish in the jack family (Carangidae). It is found in shallow parts of the western Atlantic Ocean.
The bluntnose jack is a deep bodied fish with a large, deeply forked tail fin. The dorsal fin is divided in two parts and has 8 spines and 27 soft rays. The long anal fin tapers towards the tail and has 3 spines and 23 soft rays. Adults normally grow to about 25cm (10inches) in length.[1]
The bluntnose jack is found in the neritic zone in the western Atlantic Ocean at depths down to about . Its range extends from North Carolina, through the Gulf of Mexico an southwards to Florianópolis in Brazil. It is largely absent from the Lesser Antilles.[1]
The bluntnose jack is sometimes associated with the jellyfish, Lychnorhiza lucerna.[2]