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8. Investigation of the food of larval and post-larval herrings. 



9. Investigation of the food and the condition of the older herrings of different 

 localities and in different seasons. 



England. 8 — 9) This work is just commencing, but so far over a thousand 

 stomachs of larval and post-larval whitebait and mature herring have been examined 

 from 40 different samples. Where possible plankton samples are being taken at 

 the same time. Arrangements have been made for the stomachs of mature herring 

 from freshly caught specimens to be preserved on board the drifters at sea. 



Scotland. 9) The food contents of the stomachs of the samples of herring 

 examined are recorded. 



10. Investigation of the migrations of herrings by means of marking experiments. 



Sweden. 10) The migration of the herring into the Skagerak and Kattegat 

 have been studied by continual hydrographie soundings and trawling experiments 

 from November 1921 to March 1922. 



11. Hydrographical observations to be made in connection with the biological 

 investigations, where the fishing is going on, and on the spawning grounds. 



England. 11) Hydrographical observations were regularly made on the 

 presumed spawning grounds. (See also under Hydrography). In conjunction with 

 the Air Ministry an experiment was tried off Lowestoft during the herring season 

 in spotting herring shoals from the air. Three flights were made, but owing to the 

 large amount of suspended matter in the sea in this locality it proved impossible 

 to see the shoals. 



Scotland. 11) Two special cruises were made to investigate the biological 

 and hydrographical conditions associated with an abnormal incursion of Atlantic 

 water into the northern North Sea. A report on the results obtained has already 

 been submitted to the Council. 



France. La limite méridionale du hareng au point de vue géographique a 

 été déterminée par le Laboratoire de La Rochelle. Un exemplaire a été trouvé 

 sensiblement en face de ce port. La limite du hareng en quantités susceptibles 

 d'être pêchées commercialement est à peu près l'embouchure de la Loire. 



Holland. No new investigations. 



e. Sprat. 



During the year 1921 the sprat investigations were carried out in conformity 

 with those made in 1920. 



Samples for measurement and age investigations were collected from most 

 of the places where sprats were fished for. 83 samples were collected in all. Through 

 these a comparatively good information was obtained as to the changes of the 

 stock and the movements of the larger shoals, which in many instances could be 

 distinguished through the different size and age compositions of the shoals. 



