A Video Plankton Recorder user guide: Lessons learned from in situ plankton imaging in shallow and turbid coastal waters in the Belgian part of the North Sea

Optical imaging devices such as the Video Plankton Recorder (VPR) harness unique capabilities to perform in situ observations and observe planktonic organisms their natural environmental context. However, applying this technology shallow turbid coastal waters comes with a number of challenges. Depending on research goal, methodological choices need be made regarding appropriate towing procedure instrument settings, like magnification or field view. In addition, limitations can expected related physical characteristics water column, more specifically suspended matter concentration turbidity. To inform VPR users possibilities device waters, paper evaluates specific deployment procedures Belgian part North Sea (BPNS). For three different practical feasibility, output are assessed assets liabilities for each tow types discussed. A Z-shaped clover-shaped type seen best fit detailed characterization plankton community limited geographical area. straight is suitable studies over larger area, potential capture local abundance peaks determine relation spatial variation conditions. The capacity various settings taxa size groups, was tested during four line transects magnifications. highest used from 0.3 0.7 mm while low allows within range 1.0 3.8 mm. Finally, boundary conditions turbidity column were defined implications study area investigated. This shows that high values 6.2 NTU inhibit collection useable data, complicating VPR's application many transitional waters.