— 67 — 



from the fish for the purpose of age determination. About 700 were thus dealt 

 with and the returns have been good. 



14. Experiments with savings trawls. 



England. 14) A few comparative hauls have been made with the ordinary 

 otter trawl and a trawl with large meshed baitings. These experiments will be 

 extended next year. 



16. Diseases and parasites of cod and haddock. 



Scotland. 16) The effect of common parasites, if any, on the regularity of 

 scale growth is being studied with special reference to the common Lernaea. So 

 far, tank experiments have not been employed, but it is hoped to make a start 

 with next year's brood. 



Other work: 



England. Material assistance has been afforded to investigators working at 

 the Lister Institute, and at University College, on the vitamines in various tissues 

 of the cod, livers and roes being collected and forwarded under proper conditions 

 to the investigators. 



Holland. No new investigations. 



Sweden. Researches have been made on the cod both in the Baltic and 

 the Skagerak, on the haddock in Skagerak and Kattegat, but these researches 

 are not ripe yet for publication. 



Ireland. Trawling investigations, to elucidate the size and distribution of 

 young hake, were made on the south and west coasts of Ireland. Over 800 hake 

 have been measured, and their sex and food, in most cases, determined. 



France. Conformément à ses engagements la France a envoyé à bord du 

 croiseur "Cassiopée" le Dr. le Danois qui a accompli une mission de recherches 

 sur le Banc de Terre Neuve en mai et juin 1922. Les résultats de cette mission 

 seront ultérieurement publiés. 



g. Plaice. 



Belgium. Les résultats des recherches Belges confirment ceux de nos in- 

 vestigations de 1910 et tendent à établir: 

 1° que le voisinage immédiat de la côte de Belgique ne constitue pas une nursery 



importante pour la plie, 

 2° que la perte que subirait la pêche littorale par suite de l'adoption d'une taille 



minimale de 25 centimètres ne serait pas considérable, 

 3" que l'interdiction de la pêche pour les chalutiers à vapeur ou à puissant moteur 



dans la partie orientale du Sud de la Mer du Nord ne causerait pas un dommage 



considérable à ce genre de navire et ne pourrait qu'influencer favorablement 



la petite pêcherie littorale dans cette région. 



5* 



