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Douglas Harper's Etymology Dictionary
sniggler

1840, in reference to fishing (especially for eels), agent noun from sniggle (v.) attested in this sense from 1670s, with verbal suffix -le + snig "an eel" (late 15c.), of obscure origin, but perhaps related to snake (n.), sneak (v.).

Wiktionary
sniggler

n. A person who catches eels by hand, one who sniggles.

Usage examples of "sniggler".

But I knew the gut was sound this time, and as I fancied he had risen to the sniggler, I had no anxiety about the tackle holding.

In the open water, on the Ettrick, you may see half a dozen snigglers busy.