Water Framework Directive

Visadvies, the consultant in the field of the Water Framework Directive and fish stock assessment

Fish stock survey

Fish is one of the quality elements in assessing the status of waters. The status of waters is determined using yardsticks. The presence or absence of certain fish species provides insight into the quality of the entire aquatic ecosystem in both freshwater and saltwater systems. To be able to say something about the condition of the fish population, it will first have to be sampled.
Fish stock

What VisAdvies can do for you

Our staff carry out WFD surveys on both large, small, shallow and deep waters. Sampling is carried out using the fished surface method (BOM), as described in the STOWA handbook on fish stock sampling (Klinge et. al, 2003) and the Hydrobiology handbook (Bijkerk, 2019). In this method, a predetermined water surface is fished in a standardised way with a catching device of which the catching efficiency is known. Electrofishing is used to fish banks. Seine and codend fishing are used in open water. The electrofishing device, seine and codend are used to map fish species composition. From the catches and areas fished, the size and composition of the fish stock is calculated using the returns. Based on the results, we can advise you what stage your water is in according to the WFD criteria. We can also advise you on which measures can improve the fish stock
Do you have any questions or would you like to request a no-obligation quote? Please contact one of our staff members.
Ing. Hendry Vis
Ing. Hendry Vis
+31 6 41 47 09 50
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