It has been possible for me to accomplish this homologization of 

 the species of the three groups of islands, thanks to the precise 

 information and the photographs with which Mr. Mario Novaro of the 

 Canary ISo, and Major Jo Agostinho and Abbot Eo Ferreira of the Azores 

 have courteously favored mOo 



In the Canary ISo the presence of Tho thynnus ^ although suspected 

 (also by De Buens Bol, de Pescas, Deoo 1922), had not yet been 

 demonstratedo There has not yet been any proof through hooks from 

 the Canary Iso , but nevertheless the photographs of Mr, Novaro indicate 

 its presence with all certaintyo 



6) The capacity of the tuna to make great migrations is already 



developed in individuals of small and medium sizes ( but already sexually 

 mature) " ^— • The tuna caught at Brucoli in 1926^ carrier of a hook from 

 North Spain, weighed 28 kgo The tuna taken in Oslofjord in 1927, 

 carrier of an identical hook, weighed 60 kgo 



This is not in contradiction to what I said at firstj, in a 

 relative sense, about the probable greater sedentariness of small tuna, 

 especially if immature. In this case we are dealing with tuna which are 

 already adulto 



7) The large number of hooks found in tuna, mostly in large ones, 

 in relation to the limited possibility which they have of getting hooked, 

 appears to me to be a precise indication of a condition which concerns 

 the fishery, and that is that the number of large tuna is relatively 

 limited and not infinite and thus in no way subject to influence by 

 the catch, as is generally held, — The fact is evidently related to 

 the longevity of the tuna and to its relatively slow growth, due to 

 which the very great number of juvenile tuna is gradually reduced by 

 the effects of mortality. 



In this connection I can anticipate some results of a study of 

 mine of the growth of tuna, computed from the vertebrae of more than 

 lt,500 individuals, indicating in rounded figures the annual growth (by 

 each winter annulus completed, in individuals taken in June) in length 

 and in weight for the first 14 years. 



