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I would have called it a sheet bend. It's the same knot I learned as a fisherman when tying the gangion onto the bridle of a lobster/crab trap, ...
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Did you do any tying of the other end of the gangion
(you called it by that name, and not "snood"?!) --i.e.,
the end tied to the long line (trawl)?
(And at least on the east coast, mostly?, required now
to be more rightly "ground" line --i.e., sinking,
not floating--, to keep it out of the mouths of endangered
Right Whales).
Do you recall how the gangions were hitched to the long
line? (I'm presuming that you fished in "trawls" of
long lines w/many attached pots. I think though that
in Maine area, pots are not long-line'd but individually
set & hauled?
Oh, and re the sheet bend, did you use single or double,
and did you secure the tail by tucking it through the
lay (seems de rigeur w/commercial fishing knotting)?
*kN*