Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

(To see the full tagging adventure, click through all the photos in the gallery above.) Most people would be surprised to learn how little is known about billfish. For example, how fast can they swim?

That old axiom—location, ­location, location—certainly applies to Bud N’ Mary’s Marina in Islamorada, Florida. It’s a short boat ride from where the Atlantic Ocean meets the Gulf of Mexico and the ...

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.

Special delivery: Sign up for the free Marlin email newsletter. Subscribe to Marlin magazine and get a year of highly collectible, keepsake editions – plus access to the digital edition and archives.