TR4RT - Timer Release for Ropeless Fishing

  • Developed through funding from the NOAA By-catch Reduction Engineering Program

  • Designed to reduce the risk of marine mammal entanglement by reducing the amount of time that trap lines spend in the water column 

  • Simple, reliable and low cost while having the minimum impact possible on fishing operations. 

  • Release based on user selectable time delay

  • Release by rotation of beveled cam

  • Delay time set via rotation of cam with cam tool

  • No deck unit or expendable parts

  • Operating depth is 0 to 500 feet (0 to 152 meters)

  • Battery life approximately 6 months using one set of 4 lithium AA batteries

TR4RT Operations

The system works by securing the normal trap line and float to the top of the trap with a bungee and release loop that is secured to a cam on the timer. When the time setting is reached, the line and float are released. The time is set by turning the cam. There are no other complicated controls, deck units or rope packing systems. To date, the system has been tested successfully with lobster traps, black sea bass traps, and crab traps to depths of about 300 feet in a variety of ocean conditions and bottom types. The systems are also being used for general equipment recovery applications using pop-up bouys.


4741 Orchard Avenue, San Diego, CA 92107

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