Mahi Mahi Migration

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Wessley Merten, Department of Marine Sciences, University of Puerto Rico, Mayaguez
Sandra Merten, The Grauer School
In the ocean there lives a fish known as the Mahi Mahi. Very little is known to science about how they migrate. Fishermen are helping scientists study their migration by catching Mahi Mahi with fishing rods, placing fish tags in them, and releasing them back to the wild with hope that their fish will be re-caught with the tag still in them. By using this method, fishermen in the Atlantic Ocean have marked and released 15,499 Mahi Mahi and reported 420 recaptures. The recaptures show movements between the U.S. east coast, Bahamas, and Caribbean island nations. These movements when compared to ocean currents suggest Mahi Mahi migrate around the Atlantic Ocean. This information is important to show where Mahi Mahi might be caught along their migration and to discuss how the fish should be shared between the countries it visits in order to conserve it for the future.
Original Publication

Merten W, Appeldoorn R, Hammond D. 2014. Spatial differentiation of dolphinfish (Coryphaena hippurus) movements relative to the Bahamian archipelago. Bull Mar Sci, 90. doi:10.5343/bms.2013.1078

By the Numbers

Over 40,000 students in 50 US states, the US Virgin Islands, and 25 countries participated as judges in the 2016 Ocean 180 Video Challenge.