Abstract

Since 2002, a conventional mark and recapture study operated by the Dolphinfish Research Program has begun to significantly characterize the migration of dolphinfish (Coryphaena hippurus) throughout the Atlantic. Data show that dolphinfish undergo a northward migration along the U.S. east coast, emigration away from the coast along south and mid-Atlantic bights, and appear to make annual circuits through the tropical Atlantic (north of Greater Antilles and Bahamian archipelago) and Caribbean Sea. Evidence of the latter is further presented here with 17 mark-recapture displacements from the U.S. east coast to the north central Atlantic (the Azores), tropical Atlantic, and Caribbean Sea. Mean days at liberty were 259.7 ± 103.6 days (mean ± SD); one fish released in the Gulf of Mexcio was recaptured in the Bahamas 45 days later. Measured and estimated fork lengths suggest dolphinfish grew from juvenile (52.3 ± 7.9 cm) to adult (106.1 ± 20.9 cm) life-stage while at liberty, with an observed growth rate of 2.14 mm/d. Growth estimates compiled from tagging data can prove useful in establishing the progressive change in life-stage between locations, identifying spawning locations, and defining fishing pressure on size classes necessary for implementing consistent regional management measures.

PDF Preview