The full catch monitoring in the Dutch Norway lobster fishery was part of a science-industry research collaboration project (Onderzoekssamenwerking 2.0) and aimed to improve data for the stock assessments of Norway lobster stocks. The International Council for the Exploration of the Seas (ICES) has divided the discrete patches of mud Norway lobster inhabit into so-called Functional Units (FUs). The Dutch fishery for Norway lobster mainly takes place in FU5, FU33 and outside FUs (outFU). The ICES Working Group on the Assessment of Demersal Stocks in the North Sea and Skagerrak (WGNSSK) has expressed concerns about data limitations, including lack of representative discards data in FU33. This project was set up to address these issues. To improve data for Norway lobster stock assessments, the project comprised of three phases: 1. Development of a Fully Catch-Monitored system (FCM), 2. Implementation of the FCM scheme by a reference fleet and 3. Data analysis and reporting including data sharing with ICES WGNSSK. The FCM system comprised of so-called load cells, installed to measure the total catch of a haul. In addition, the reference fleet participates in a self-sampling scheme in which discard samples 80 kg are taken from two hauls during a fishing trip. A sample of approximately 5 kg of Norway lobster landings is taken from these same hauls for length measurements. The self-sampling scheme is validated with observer trips. The reference fleet (2018-2020) consisted of three vessels. In 2019 two observer trips were executed and one in 2020. Due to COVID-19 restrictions, more observer trips were not possible. A total of 34 self-sampling trips have been carried out (12 in 2019 and 22 in 2020). The collected data provides valuable insight in catch composition, including in the length-frequency distribution, and fishing effort of the reference fleet in regard to the FUs. WGNSSK has raised some concerns about how representative participating vessels are for Dutch fishing effort on nephrops, as they are Dutch owned but ...