Aquatic macroinvertebrate survey and identification, Congresbury Yeo
Team Van Oord

Aquatic MacroInvertebrate Survey & Identification, Congresbury Yeo

The brief

Our aquatic team were required to survey several ditch sites to assess the range of aquatic invertebrates in them. This was part of our client’s on-going flood defence works.

What we did

  • Ditches which had been proposed to be infilled were investigated by our aquatic specialists to identify if any rare or scarce species were inhabiting them. Our team surveyed the ditches using a standardised 1mm mesh pond net, and following best practice protocol.
  • Several water quality parameters were analysed in the field.
  • Aquatic macroinvertebrate identifications were completed either in the field or back in the laboratory.
  • Aquatic invertebrates were identified to family level.
  • Biotic indices scores were assessed and the Biological Monitoring Working Party (BMWP) biotic index was used to calculate scores for key family groups of aquatic invertebrates present based on their sensitivity to pollution.
Our survey showed that water quality scores for the sites were classed as ‘Moderate’ or ‘Poor’. No aquatic invertebrates were recorded as being rare or scarce. Works at Congresbury Yeo were able to continue as no mitigation measures were required.
Thomson project manager, aquatic macroinvertebrate survey & identification, Congresbury Yeo
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Projects Aquatic MacroInvertebrate Survey & Identifica...