Knot tying apparatuses and fishing related structures

An apparatus comprising:

• a body including an outer surface of the body;
• a channel of the body that extends for a length in the body and is exposed at a first end of the channel and at a second end of the channel;
• a trench in the body extending from the outer surface of the body toward the channel of the body;
• a neck between the trench and the channel, the neck configured to contain first and second flexible lines extending in the channel from the first end of the channel to the second end of the channel;
• and
• a line guide on the outer surface of the body configured to hold the first flexible line or the second flexible line at an oblique angle relative to a direction of the channel.

An apparatus comprising:

• a body including an outer surface of the body;
• a channel of the body that extends for a length in the body and is exposed at a first end of the channel and at a second end of the channel;
• a trench in the body extending from the outer surface of the body toward the channel of the body, wherein a portion of the trench is configured to contain first and second flexible lines extending in the channel;
• and
• a securing line guide on the outer surface of the body configured to hold the first flexible line or the second flexible line at an oblique angle relative to a direction of the channel while rotating the body.