This study is a sub-study of the overarching socio-economic impact analysis of fisheries. The central research question is: what is the socio-economic size of the fish clusters per fishing region and to what extent do these fish clusters depend on Dutch fisheries? This study is a baseline measurement. Not only the effects of policy decisions but also the impact of current developments are included in this study, such as the energy crisis due to the war in Ukraine and uncertainty about the future due to the announced decommissioning of the Dutch cutter fleet (2022-2023). Of the total population, 346 companies belonged to the Dutch fish cluster with a total turnover of €6.6bn and13,550 employees (8,350 FTEs) in 2021. Of these, 314 companies were dependent on North Sea fisheries, ranging from 5% to 100% for turnover. With an average 40-50% dependence on North Sea fisheries for turnover, about half (€2.9bn) was directly attributable to North Sea fisheries. The chain and supply industry in all six defined fishing regions saw negative impacts of policy decisions on North Sea fisheries, although the impact was caused by a stacking of both national and European policy decisions and market developments (such as high fuel prices). The fishing regions that experienced the greatest negative impacts were IJmuiden, Urk, Kop van Noord-Holland and Zuidwest-Nederland. In contrast, negative impacts for fish clusters in the Katwijk-Scheveningen and Wadden coast regions were less significant. Fish auctions and fishing cooperatives are most dependent on North Sea fisheries. Unlike the other links in the chain, fish auctions and fishery cooperatives have little or no diversion options in the event of a shrinking cutter fleet and decreasing supply. In the opinion of the companies in the fish clusters, the biggest concerns are: (1) the loss of staff and thus the hard-to-replace specialist professional knowledge built up for years in practice from generation to generation, (2) the worsened competitive position due to the loss of the ...