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Spring Dipping for Lamprey

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Add to Flipboard Magazine. Fuente: Blashford Lakes Nature Reserve - View all news from this site
Spring Dipping for Lamprey Spring Dipping for Lamprey

Spring Dipping for Lamprey




It was lovely to be back at Blashford on Sunday after a two week break, with the sun shining and chiffchaffs calling from what seemed like every other tree. It was time again for our monthly Young Naturalists meeting, and … Continue reading →

It was lovely to be back at Blashford on Sunday after a two week break, with the sun shining and chiffchaffs calling from what seemed like every other tree. It was time again for our monthly Young Naturalists meeting, and with the weather warming up we began with a rummage through the light trap. It revealed a number of Common and Small Quakers and Hebrew Characters along with this rather pale Brindled Beauty.
Brindled Beauty by Talia Felstead
The light trap also contained a number of Clouded Drabs, with this one in particular making us take a closer look:
Clouded Drab by Talia Falstead
We wondered if it could perhaps have been a Lead-coloured Drab instead, but couldn’t be sure. Having only a photo to show Bob today, we’ve decided it probably was a Clouded Drab, as their colours can be quite variable, but you never know, we might be wrong!
After carefully putting the moths back in the light trap to be released later in the day, we headed down to the Dockens Water in search of Brook Lamprey. Brook Lamprey can grow up to 15cm and can easily be confused with small eels, but they lack jaws, instead having a sucker disc with a mouth in the centre. They also lack scales, any paired fins and a gill cover, instead having a line of seven respiratory holes behind the eye. They are easily overlooked, burrowing down into sand, silt or mud before emerging in the Spring to spawn. They die soon after spawning, but their corpses are quickly devoured by fish and birds so often are not found.

Now was the time to go looking for them, and we knew a couple had been caught on a school visit the week before. We were in luck, catching nine in our usual river dipping spot and another two when we searched further downstream.

We also caught bullhead fish, mayfly nymphs, caddisfly larvae and pond skaters. On moving further downstream, we caught a large number of dragonfly nymphs, fourteen in total. We decided they were likely to be nymphs of the Golden-ringed dragonfly, a species that usually patrols upland and heathland streams. The nymphs often burrow down into the stream’s muddy or sandy bottom, leaving only their head and the tip of their abdomen exposed. They may remain in the same position for several weeks, waiting to ambush any prey that passes by.
With the Dockens starting its journey to the sea in the New Forest, it is not surprising the nymphs have found their way downstream to us, and whilst we don’t get many sightings of the adults on the reserve they are sometimes seen hawking low over the water.

It was great to see so many nymphs of all different sizes, we should have Golden-ringed dragonflies emerging from the Dockens for a good few years!
Whilst down by the river, we t...
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Spring Dipping for Lamprey Spring Dipping for Lamprey

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News source: Blashford Lakes Nature Reserve
Publication date: 29-03-2017 16:02
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