I developed a line of products that attract fish to your lures without batteries or electronics. And it works! My first product was a Portable Black Box for salmon trollers. Apparently it works on tuna as well. It is small (3 1/2" long) and connects inline close to your jigs. It gives off about .7 volts and lasts a long time. Salmon sports fishers are getting 1 to 4 yrs out of one. We have Canadian commercial tuna fishers who have been using these for 2 yrs, and it is obvious that the fish will take the jig closest to the voltage source.
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