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Long-term changes in ray populations in the North Sea
Walker, P.A.; Heesen, H.J.L. (1996). Long-term changes in ray populations in the North Sea. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 53(6): 1085-1093. hdl.handle.net/10.1006/jmsc.1996.0135
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139, more
Peer reviewed article  

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Keywords
    20th century; Bottom trawls; Landings; Rays; Skates; Netherlands, North Sea [Marine Regions]; Marine

Authors  Top 
  • Walker, P.A.
  • Heesen, H.J.L.

Abstract
    Three data sets have been analysed: landing statistics (1903–1993), International Bottom Trawl Surveys (1979–1993), and survey data collected in Dutch coastal waters between 1951 and 1994. Landings of rays and skates have decreased by more than half compared with the post-war level. Starry ray has increased in abundance in the central North Sea between 1970 and 1993. Thornback ray virtually disappeared from the Dutch coastal area in 1958. No significant trend has been observed for the other species.

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