I learned these trotlining making methods from two commercial fishermen with a combined 60 years of expierence. I dont want to debate on commercial fishermen. These are good men who make an honest living with hard work. The results are undeniable, I have seen them. This is how they build a trotline. . Mainline is #24-#36 . Nib lines are #7 doubled with a total length of 8" . Swivels are #7 Rosco or champion . Hooks are Stainless steel 34009 Mustad size 1/0 Nib lines are set 12' apart on lakes and 9' apart on rivers. With nib lines set closer than 7-8' cats can get wrapped in each other and twist off also with the nib lines spaced farther apart it is easier to get one fish off without jerking off another. I wasnt sure about the distance between nibs and the hook size but from what I have seen this configuration far outshines commercially made trots. The hook size while small for rod and reel fishing is great for trotlining because the smaller eating size cats are more likely to be hooked and that is the size wanted when trotlining for the most part. Hope this helps someone out. Also the trots are stored in jump box's. Ill try to post a few pics later.