Whilst doing a spot of invertebrate surveying, good numbers of grayling could be seen congregating in pool tails. judging by all their dashing about and shenanigans, it was clear they'd gathered for their spawning rituals. Many of the larger adults had assumed a dark pigment, making them glaringly obvious. some of these must have been nosing 3lb. Oddly, I never seem to find them during the season...? Nonetheless, it was interesting to watch and dotted about on the streambed were numerous redds, identified by freshly disturbed gravel.