Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 20 - 10 'i 1 1—1—1—1—1—1—r JAN FEB . Fig. 15. Monthly catches of males and females in Madeira from 1951 to 1954. MALES FEMALES :i 11 1 1 —\ r—1 1 1—1 , Fig. 16. Monthly catches at Setubal, Portugal from 1946 to 1950. These remarks on the migrations of sperm whales in the eastern North Atlantic, summarized in Fig. 17, are based on the circumstantial evidence of catch statistics and they are intended as no more than conjecture
Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 20 - 10 'i 1 1—1—1—1—1—1—r JAN FEB . Fig. 15. Monthly catches of males and females in Madeira from 1951 to 1954. MALES FEMALES :i 11 1 1 —\ r—1 1 1—1 , Fig. 16. Monthly catches at Setubal, Portugal from 1946 to 1950. These remarks on the migrations of sperm whales in the eastern North Atlantic, summarized in Fig. 17, are based on the circumstantial evidence of catch statistics and they are intended as no more than conjectures. The catches involved are not large and it would be profitable to analyse on similar lines the detailed records maintained by the Gremio dos Armadores da Pesca da Baleia of all whales caught at the Azores, Madeira and Setubal since 1946. However, unless adequate whale marking can be done in the North Atlantic we may expect no definite conclusions on the distribution and migrations of sperm whales in these seas. RACIAL IDENTITY OF THE STOCK The present report, whilst particularly concerned with the Azores, has also attempted a comparative treatment looking for any differences which may exist between the various stocks of sperm whales in different oceans. The available data, although not sufficient for any firm conclusions, do appear to merit a general discussion. Published reports based on data from a series of sperm whales are limited at present to samples from stocks of the Southern Seas (South Georgia and South Africa), of the eastern North Pacific (Japan and the Bonin Islands) and of the North Atlantic (Azores). * Six whales from Norway are recorded in the International Whaling Statistics as females, but none measured less than 44 ft. and they were doubtless males. See p. 243. (• From records in the Estatistica das Pescas Maritimas (1946-50) of 131 male and eighteen female sperm whales caught at Setubal, Portugal.
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