Video of Riverfly sampling from beat 7 30.6 2021 with Adrian Davis

This is only the second sampling at Rocester Beat 7 with an impressive score of 14 ( trigger level 7) boosted by approx 90 heptagenlidae nymphs the most I have ever seen in the 4 years of sampling at Norbury Dove . The video shows them all sizes darting around the ones with flat heads and black

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