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21 Fathom

I have heard people in NE Florida reference 21 Fathom for bottom fishing and am looking for some clarity.  Is 21 fathom a specific fishing spot or a depth that is good to fish at?  


  • kayjay90kayjay90 FlaglerPosts: 52 Deckhand
    Good depth to fish. If you don’t have any spots marked around that depth try trolling for a half day while keeping an eye out for good bottom and mark it.
  • StonehengeStonehenge Posts: 213 Deckhand
    OK, thank you for confirming.  I had always wondered. 

    I typically start trolling at a public numbers spot and find new spots from there.  They are always in close proximity.  However, I haven't tried trolling from a random location based on depth.  I would imagine this is when you begin to find really good spots.  
  • kayjay90kayjay90 FlaglerPosts: 52 Deckhand
    Trolling around the 21fathom mark usually isn’t as productive as going out to the ledge but u might pick up on some scattered weeds and pick a tuna or mahi off certain times of the year. But if your looking to get into some bigger trigs and grouper it’s a good place to start IMO. Cheers!
  • elpollolocoelpolloloco JACKSONVILLEPosts: 304 Deckhand
    21 fathom refers to depth or 120 ft, fathom is 6 feet. Our bottom here from is 80 to 100 foot from 15-35 miles out. When you get out to 35+ plus it drops to 21 fathoms. Then as you get out further you hit 23 fathoms.  23 bottom is full of ledges to fish as well. Another few miles past there you hit the "ledge" where it goes from 160-180 sharply? Something like that then it drops off after that to 500-600+ ft. 
    That is basically it. It refers to the bottom and how it drops off. 
  • StonehengeStonehenge Posts: 213 Deckhand
    Thank you all for the feedback!

  • Family TraditionFamily Tradition Posts: 98 Deckhand
    Stone you're right on about trolling in a general depth and finding bottom. When I started offshore fishing that's how I found all my spots. Started trolling for kings and learned nearshore waters then started trolling for dolphin, wahoo and tuna and learned deeper waters. If slow trolling you have a decent idea of what you're going over right away but if you're high speeding and mark anything on the bottom it's worth marking then going back over while bottom fishing. Guaranteed you'll find tons of productive bottom if you keep your eyes on the bottom machine. 
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