I am confused. Following Alan's (salmonguy) link I find this:
In most salmon rivers or parts of salmon rivers mentioned in this publication, only fly fishing is authorized. In this case, when fly fishing, you must abide by the following rules:
you must use rods equipped with unweighted lines with only one artificial fly*;
artificial flie may be composed of a combination of hooks that takes into account the size of the hooks illustrated to actual size below; such flie must never have more than three points;
flie may have attachments made of silk, metal wire, wool, fur, feathers or a combination of these materials or other materials;
flie must not have spinning or waving parts, nor be equipped with weights to facilitate sinking;
flie must not be baited unless stipulated otherwise in this brochure.
* Outside the salmon sportfishing period, up to three artificial flies may be used when fishing for species other than salmon is authorized. However, when fishing in salmon river in Zones 23 and 24, you must always use single flies with a single, double or triple hook.
The biggest size of hook allowed when the flies is equipped with:
Note: There is no restriction on shank length.
When authorized, angling is practiced using a line equipped with lures, hooks or flies, baited or not. Hooks may be single, double or triple. A lure or fly counts as a hook. A line must not have more than three hooks.
Therefore I assume that an "unweighted line" can be a sinking line but it can not have any additional weight on it.
Treble hooks are allowed but less than size 6.
I am not sure how to interpret this "flie may have attachments made of silk, metal wire, wool, fur, feathers or a combination of these materials or other materials;
flie must not have spinning or waving parts, nor be equipped with weights to facilitate sinking".
Apparently flies may be tied with metal wire but no weights are allowed.
There is no mention of tubes.
Any further info would be a great help.