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This conical shaped net bag is designed to fit onto the professional hand net frame. It has a mesh size of 250µm which is suitable for sampling surface chironomid exuviae.
Chironomid (non-biting) midges are responsive to a wide range of environmental parameters such as pollution and eutrophication. As such, the abundance and diversity of these midges can be used as a reliable indicator of climate and environmental change. The species composition and relative abundance of Chironomids can be studied by collecting floating Chironomid pupal exuviae (skins) and this is now a popular method of monitoring the water quality of lakes and rivers.