Right time, right place, wrong gear ...

A recent photograph on Flickr by Bob the Bolder showed a salmon leaping the wear on the River Wear just below Durham cathedral in mid-August, which is early for these fish to start moving up river to spawn. 


One October afternoon five years ago I happened to be walking past Spurleswood beck in Hamsterley forest in Weardale just at the time when salmon were trying to leap the waterfall there. We watched for half an hour while fish after fish hurled itself into the torrent but none made it to the top. Conditions were probably close to perfect for the fish, with the beck in spate and a deep plunge pool below the waterfall where the upwelling water would have given the fish extra impetus, so maybe some made it after we left. 

It's hard to be sure whether these were sea trout or salmon but judging from the indentation in the tail fin I think they were salmon. Sea trout tend to have a straight trailing edge to the tail fin.

I didn't have any decent photographic gear with me when I took these bu,t judging by Bob the Bolder's photo, now is the time to plan for a return visit............

St.John's Chapel, Weardale

It was only a little over a fortnight since we'd taken our regular circular walk around St.John's Chapel in Weardale but, when we visited again on Saturday, the intervening period of almost dawn-to-dusk sunshine had transformed the landscape. All the early summer flowers, like the wood cranesbill, had run to seed and perfect haymaking weather meant that all the meadows had been mown. 

Even though this was only July, it seemed as though the summer is slipping by and it felt, as they say around here, 'proper back-endish'.

Harebells and crested dog's tail grass beside Harthope burn

Marsh woundwort in flower beside a ditch at the bottom of Chapel Fell

The frothy blossom of meadowsweet, once used for flavouring mead (the name has nothing to do with meadows, it refers to mead).

Monkey flower Mimulus guttatus in the gravel beside the river Wear. Thirty years ago, when I first saw it on this spot, this alien plant from the western United States was much commoner along the river than it is now - it seems to have gone into decline.

Rushes flowering on the slopes of Chapel Fell. For much of the year these are dull plants but for a brief period, when they flower, they look very attractive in the sunlight (double-click for a clearer image)

Timothy Grass Phleum pratense, flowering in corners of meadows that the mower missed. Very similar to meadow foxtail Alopecurus pratensis, but that flowers in spring and this flowers in mid-summer.

A most heartening sight - one of twelve freshly emerged small tortoiseshells on creeping thistles, on the flanks of Chapel Fell. These butterflies seem to be doing very well around here this year - we had seven at once on the Inula flowers in our front garden this weekend.

Spot the fish: a trout, keeping station in the sunlit river below a waterfall, catching whatever the river delivers and only given away by its shadow - the fish's back is a very close match for the colour of the underlying rock.

Up on Chapel Fell the lapwings have finished nesting and are now forming flocks with their juveniles.

Go with the Flow

Could there be any more relaxing way of whiling away a warm summer's afternoon than to lean over a bridge and watch trout in a stream? With a few sinuous flicks of their tails they expend just enough energy to hold station in the current, waiting for food to be wafted in their direction.

I photographed these beautifully marked brown trout in Middlehope burn, a crystal-clear tributory of the river Wear at Westgate in Weardale.

Tales from the Riverbank....

Many of the rocks along the banks of the upper reaches of the river Wear carry the empty nymphal cases of stoneflies, recognisable by the paired tail filaments. The split in the thoracic segments marks the point where the adult insect eased its way out of the nymphal exoskeleton after the nymph crawled out of the water.

Stoneflies tend to be confined to fast-flowing, well oxygenated, unpolluted rivers, which is a pretty good description of this stretch of the river Wear between Wolsingham and Black Banks, in Weardale. Currently, after a long spell without heavy rain, the water level is low and mayflies are laying eggs in the shallows and pools.

Mayflies are the only insects that moult in their adult stages. The winged adult that emerges from the nymph is the subimago (known to anglers as a 'dun') and this undergoes a final moult to become the imago ('spinner' in angling parlance). This is an imago that appears to be laying eggs, and drowning in the process. Females have shorter front legs than the males.

Mayfly nymphs have three tail filaments but the adults can have two or three tail filaments, depending on genus. The hind wings in mayflies are much shorter than the forewings....

.. and both pairs are held vertically above the body when at rest.

There are two large compound eyes and three small ocelli in between them. Adult mayflies do not feed during their short lives, so there are no functional mouthparts.

Male mayflies are notable for their extremely long front pair of legs, which are used to grasping females during mating flights.

During emergence and mating flights low over the water surface, vast numbers fall victim to fish - especially leaping trout - while those that survive fish predation ...

....become food for birds like dippers, which also feed on the nymphal stages of stoneflies and mayflies.