I would love to get my hands on some small nymph hooks but all the shops in my area (closest being over an hours drive away) do not stock anything smaller than 16 if you're lucky, with 14 being the smallest in most cases, even for dry fly hooks. Short of ordering online there is other no option for me.

But judging from the nymphs in the streams 18 and 20 are often the most abundant at certain times of the year