The Billfish Foundation

Release Rulers

Release Ruler

Release Rulers are highly durable, hand made instrument to measure length and estimate average billfish weights based on decades of harvest data and scientific research using the lower jaw fork length (LJFL) measurement. Promoting conservation with innovation! 

Available for the following species: 

  • Blue/Black Marlin
  • White Marlin
  • Sailfish
  • Swordfish
  • Striped Marlin

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