Which type of knot is best used for connecting two fishing lines?

The Blood Knot is the best choice for connecting two fishing lines because it is specifically designed for this purpose. This knot is particularly effective for tying together lines of similar diameters, often used when joining two pieces of fishing line, such as when a fisherman wants to add a leader line to their fishing setup. The Blood Knot maintains a strong connection while allowing the lines to lie fairly parallel to each other, minimizing tangles and ensuring a smooth transition during casting.

Other knots, like the Trilene Knot and Improved Clinch Knot, are primarily used for attaching hooks and lures to the end of a single line and might not perform as well when joining two lines. The Snell Knot is commonly utilized for attaching a hook to a line but does not serve the purpose of connecting two lines together. Each of these knots has its specific applications in fishing, but for the distinct task of joining two lines, the Blood Knot is optimal.