I attended an excellent training course with Buglife Scotland today - an Introduction to Freshwater Invertebrates.
The day started with an excellent (though by necessity very speedy) introduction to the freshwater invertebrates found in Scotland by Craig MacAdam. There are many different types, including the larval forms of many species of insects that we don't think of as associated with water (it was good to be reminded that 1/3 - 1/2 of all hoverfly species start life as aquatic larvae!).
We then went outside to two sites to take water samples and see what we could find. The brave amongst us (which didn't include me) donned waders, though really wellington boots were more than adequate protection as the water isn't deep. We started at the Braid Burn
We had some basic equipment with us, much of which is repurposed kitchen equipment
The Burn produced far more invertebrates than the pond, including these several mayfly larvae
It was an excellent training day - I can thoroughly recommend Buglife courses if you're interested in invertebrates.