OWEZ project, parts of the Northsea have been visited and seabirds along transects were counted. ESAS database

Movement of individual Seals followed by Telemetry

The main purpose of this sampling was to study the larvae and eggs in the Dutch EEZ, on a monthly basis

A high resolution sonar (DIDSON) was used to record the fish community in the vicinity of the monopiles. It is a good instrument for estimating the abundance of fish around the piles and to study the behaviour fish around the piles, although from the images of the DIDSON it is not possible to identify all fish species.

The main purpose of this sampling was to study the effects on fish near the monopiles in the OWEZ windpark. A multi-mesh gillnet is used, with six mesh sizes. Each mesh size forms a single panel of 6,7 meters in width. Every mesh-size panel occurs twice in each net, thus a complete net consists of 12 panels and has a length of about 80 meters.

The survey applies hydroacoustic techniques to get an estimate of the pelagic fish stock community due to the construction of the Offshore Windfarm Egmond aan Zee (OWEZ). The monitoring program comprehends a baseline study (T0) before the construction of the windfarm, one study period a year after its construction (T1) and a monitoring study 5 years afterwards (T5). Temperature and salinity data were collected using Hydrolab datasondes attached to the towed body as well as separate downcasts. The acoustic instrument used is a SIMRAD EK60 echosounder with 38kHz split-beam transducer.