— 5 — 



gâtions have so far collected with regard to the plaice, not only biological and that 

 from the fishery statistics, but above all the full results of all those investigations which 

 have been made on the distribution of the plaice of the North Sea according to size 

 and age, and on the composition of the scientific hauls and the landings in the fishing 

 ports. 



Owing to the great amount of work thus demanded for the preparation of the re- 

 ports of each individual country, the compilation and printing of these took more than 

 two years, i.e. until August 191 1. The following Reports on the plaice question, here 

 arranged in chronological order of completion, have been laid in printed form before the 

 Central Council and the General Reporter: 



HOLLAND. Bericht über die holländische Schollenfischerei und über die Natur- 

 geschichte der Scholle der südlichen Nordsee. Von Dr. H. C. Redeke. Sent in July 1909. 



DENMARK. Bericht über die dänischen Untersuchungen über die Schollenfische- 

 rei und den Schollenbestand in der östlichen Nordsee, dem Skagerak und dem nörd- 

 lichen Kattegat. Von A. C. JOHANSEN. Sent in May 1910. 



ENGLAND. Report on the Research work of the Board of Agriculture and Fishe- 

 ries in relation to the plaice fisheries of the North Sea. Vol. I — IIL Special statistics. 

 Size and weight. 1908 — 1910. By WALTER S. Masterman. Sent in complete Sep- 

 tember 1910. — Vol. IV. Biological statistics. Age and sex. By A. T. Masterman. 

 Part (for the year 1905/06) sent in July 191 1. 



BELGIUM. Contributions à l'Etude biologique et économique de la Plie. By G. 

 GiLSON. Sent in September 19 10. 



GERMANY. I. Über Schollen und Schollenfischerei in der südöstlichen Nordsee. 

 Von Fr. HeinCKE und H. Henking. Sent in June 1907. 



IL Die Statistik der deutschen Schollenfischerei im Nordseegebiet. Von H. Henking. 

 Sent in August 191 1. 



Scotland, Sweden and Norway have not sent in any comprehensive report in 

 accordance with the resolution dated Copenhagen, July 1908, of their investigations with 

 regard to the plaice. 



The General Report on the Plaice Question is mainly compiled on the basis of the 

 great amount of material contained in these individual reports. A mere summary of the 

 results contained in these single reports would however, naturally be inadequate as a 

 General Report; it was necessary, in order to provide a sufficient basis for practical pro- 

 tection measures, to give, as exhaustively as possible, a review of all the data bearing 

 on the plaice hitherto obtained by the International Investigation. The General Report 

 will be divided into two parts ; the first, and from a practical point of view the most 

 important, dealing with plaice fishery and the question of protective measures; the se- 

 cond with the biology of the plaice. 



