The tuna knot is a reliable knot that retains nearly 100% of the line’s rated breaking strength, for attaching hooks and swivels.
Based on the step-by-step illustrations in the book, Catfish Fishing Knots and Rigs
by Amazon: https://www.amazon.co.uk/dp/B01NBU3EXY/ref=cm_sw_em_r_mt_dp_7ACMNDVPBFK1RARAWHGY
and Andy Steer’s Complete Book Of Fishing Knots
by Amazon. Learn more: https://www.amazon.co.uk/dp/1542337941/ref=cm_sw_em_r_mt_dp_WPG1W45K0PW5RBRW65SX
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