RAPPORTS. XIV: EHRENBÀUM —10— REPORT ON THE MACKEREL 



measurements of the trawl-caught mackerel at the Hamburg market and of the line-caught 

 fish at Helgoland. It is also possible to discern certain size-groups in this material, at 

 least amongst the younger fish, but for the reason mentioned above, it is difficult to 

 demonstrate them correctly. It is highly desirable that these studies of the age-groups 

 might in future be carried out on a larger scale and at different localities. 



A considerable part of my report will be made up of the description of the 

 mackerel fisheries in the different countries, and of statistical tables, showing the 

 yield of these fisheries by weight and by value at different times. It was necessary to 

 treat these matters in detail, in order to give an exhaustive and instructive review of the 

 mackerel and its catches in the waters of the Atlantic and Mediterranean; but in the 

 brief summary, given here, I have thought it suitable to refrain from refering to that part 

 of my work in^more detail. 



