These two structures caused us to ponder when we came across them in the Meavy. My best bet at the time was that they were being used to count young fish. As it turned out I was wrong. After the walk I exchanged e-mails with someone who could give an expert opinion. Here's the gist of what he said. The Meavy is a good river for salmon and trout which lay their eggs in the gravel of the river bed. Successful development of the eggs, and hence the maintenance of fish stocks, depends upon adequate oxygenation of the gravel. Oxygenation of the gravel is affected by pollution. Measuring the oxygenation of the gravel is important so that remedial measures can be put in place if problems are identified. The bits of kit we see are measuring oxygen levels in the gravel and are part of a research programme run by Plymouth University. Who knows when this piece of knowledge will come in useful again. |
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