Long-Term Retrospective Analysis of Mackerel Spawning in the North Sea: A New Time Series and Modeling Approach to CPR Data
Figure 1
Mackerel populations and distribution around the north-western European shelf.
Continental shelf marked in grey (bottom depth <250 m). North Sea and western mackerel spawning areas indicated by dots. Each dot marks an observation of 50+ eggs m−2 day−1. Data from international mackerel egg surveys (Blue = North Sea 2002–2011 [7], [34], [35], Green = Western areas 1977–2007 (ICES WGMEGS)). Blue rectangle marks the approximate main coverage of the international mackerel egg survey in the latter years [7], [34], [35].